Tandem Rh-catalyzed oxidative C-H olefination and cyclization of enantiomerically enriched benzo-1,3-sulfamidates: Stereoselective synthesis of trans-1,3-disubstituted isoindolines

Article abstract of DOI:10.1021/acs.joc.8b00204

A tandem process, involving Rh(III)-catalyzed oxidative C-H olefination of enantiomerically enriched 4-aryl-benzo-1,3-sulfamidates and subsequent intramolecular aza-Michael cyclization has been developed. The reaction produces trans-benzosulfamidate-fused-1,3-disubstituted isoindolines as major products, in which the configurational integrity of the stereogenic center in the starting material is preserved. Further transformations of the benzosulfamidate-fused-1,3-disubstituted isoindolines are described.

Full text of DOI:10.1021/acs.joc.8b00204

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Tandem Rh-catalyzed oxidative C-H olefination and cyclization
of enantiomerically enriched benzo-1,3-sulfamidates:
Stereoselective synthesis of trans-1,3-disubstituted isoindolines
Raghavendra Achary, In-A Jung, and Hyeon-Kyu Lee
J. Org. Chem., Just Accepted Manuscript • DOI: 10.1021/acs.joc.8b00204 • Publication Date (Web): 15 Mar 2018
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Tandem Rh-catalyzed oxidative C-H olefination and cyclization of
enantiomerically enriched benzo-1,3-sulfamidates: Stereoselective
synthesis of trans-1,3-disubstituted isoindolines
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Raghavendra Achary,† In-A Jung†,‡ and Hyeon-Kyu Lee†,‡*
†Korea Chemical Bank, Korea Research Institute of Chemical Technology, PO Box 107, Yuseong, Daejeon 305-
600, Korea; ‡Department of Medicinal Chemistry and Pharmacology, University of Science and Technology,
113 Gwahango, Yuseong, Daejeon 305-333, Korea.
leehk@krict.re.kr
ABSTRACT
A tandem process, involving Rh(III)-catalyzed oxidative C-H olefination of enantiomerically enriched
4-aryl-benzo-1,3-sulfamidates and subsequent intramolecular aza-Michael cyclization has been
developed. The reaction produces trans-benzosulfamidate-fused-1,3-disubstituted isoindolines as major
products, in which the configurational integrity of the stereogenic center in the starting material is
preserved. Further transformations of the benzosulfamidate-fused-1,3-disubstituted isoindolines are
described.
INTRODUCTION
Owing to their atom- and step-economic nature, direct catalytic activation of unreactive C-H bonds and
subsequent C-C bond formation reactions have become increasingly important in routes for the
synthesis of organic substances. Among transformations of this type, site-selective, transition metal-
catalyzed, C–H bond functionalization reactions of arenes bearing directing groups have emerged as
powerful and straightforward methods for the preparation of structurally diverse molecules.1 In earlier
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studies, Pd(II)2 complexes were extensively explored and widely used to promote C-H activation
processes. However, more recently, Ru(II)1f,3 and Rh(III)1a,4 complexes have been found to exhibit high
catalytic activities, lower catalyst loadings and broader functional group compatibilities, which in some
cases are superior to those of Pd(II) catalysts.
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In these catalytic C-H bond functionalization processes, pre-coordination of transition metal catalysts
to directing groups and subsequent selective activation of proximal ortho C-H bonds are fundamentally
important steps.5 Therefore, a large effort has been devoted to site-selective functionalization of C(sp2)-
H bonds of arenes bearing various directing groups5 such as amides, anilides, carbamates, sulfonamides,
ketones, acids, esters and hydroxyls. In addition to these monodentate groups, bidentate directing
groups, most typically 8-aminoquinoline amides,2b,6 have also been observed to promote activation of
C-H bonds effectively. These types of directing groups not only enhance the activities of the transition
metal catalysts but also confer site-selectivity on the reactions.
In this regard, we recently demonstrated that enantiomerically enriched 5-membered cyclic sufamidates
serve as a novel chiral directing groups7 (Scheme 1).
Scheme 1.
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In those efforts, we showed that 5-membered cyclic 4-aryl-sulfamidates (R)-1 and (R,R)-4
undergo oxidative C-H olefination with alkenes
respective styrene and bis-styrene intermediates
the corresponding 1,3-disubstituted isoindolines (S,R)-
these processes, the configurational integrities of the stereogenic centers in the starting
sulfamidates ( )- and (R,R)- are completely retained and trans-1,3-disubstituted isoindolines
are formed exclusively (Scheme 1). Moreover, we found that the cyclic sulfamidate moieties in
the isoindoline products and produced in the process are reactive with a variety of
2
, in the presence of Rh(III) to generate the
or , which spontaneously cyclize to produce
or (S,R,R)- as exclusive products. In
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A
B
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R
1
4
3
5
nucleophiles.7-8 Consequently, this moiety serves as a versatile synthetic handle for further
functionalization of the isoindoline ring system.
RESULTS AND DISCUSSION
In continuation of this efforts, we explored C(sp2)-H functionalization reaction of enantiomerically
enriched, 6-membered 4-aryl-benzo-1,3-sulfamidates 6 to determine if they would serve as effective
substrates for processes that form enantiomerically enriched chiral benzo-1,3-sulfamidate-fused-
isoindolines 7. Most of the requisite chiral 4-aryl-benzo-1,3-sulfamidates 6 employed in this study were
prepared using a slight modification of previously described methods9 involving asymmetric addition
of arylboronic acids to cyclic sulfamidate imines C (Scheme 2, Method A). These processes take place
in most cases with excellent levels of enantioselectivity (96-99%ee). The exception of this trend is (R)-
6b, which is produced in low enantiomeric purity of 88%ee. Consequently this sulfamidate was
prepared by using asymmetric transfer hydrogenation10 of corresponding imine D, a process that occurs
with a high level of enantioselectivity (94%ee) (Scheme 2, Method B).
Scheme 2. Stereoselective synthesis of 4-aryl-benzo-1,3-sulfamidates 6
In the initial studies aimed at optimizing the reaction conditions, (R)-4-phenyl-benzo-1,3-sulfamidate
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((R)-6a) and methyl acrylate (2b) were chosen as model substrates and subjected to selected oxidants
and additives in various solvents in the presence of rhodium catalyst, [RhCp*Cl2]2, at 100 oC (Table 1).
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Table 1. Optimization of the reaction conditions a
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Additive
(eqiv.)
Time
(h)
Conversion
(7:8:9)b%
Entry
Oxidant (eqiv.)
R (eqiv.)
Solvent
1
2
AgOAc (2.0)
AgOAc (2.0)
AgOAc (2.0)
AgOAc (2.0)
AgOAc (2.0)
AgOAc (2.0)
AgOAc (2.0)
AgOAc (2.0)
Cu(OAc)2 (2.0)
--
Me (2)
Me (2)
toluene
t-amyl-OH
CH3CN
12
12
12
12
12
12
6
>99 (21:72:7)
>99 (22:24:54)
>99 (52:35:13)
>20 (0:0:20)
--
3
--
Me (2)
4
--
Me (2)
acetone
CH3CN
CH3CN
CH3CN
CH3CN
CH3CN
CH3CN
CH3CN
CH3CN
CH3CN
CH3CN
5
--
Me (1.5)
Me (1.1)
Me (1.1)
Me (1.1)
Me (1.1)
Me (1.1)
Bn (1.1)
Bn (1.1)
Bn (1.1)
Bn (1.1)
>99 (58:30:12)
>99 (60:30:10)
>99 (90:10:0)
>99c (92:8:0)
>99 (57:33:10)
>99 (65:30:5)
>99d (100:0:0)
85d (51:0:34)
75e (23:0:52)
>99 (74:21:5)
6
--
7
K3PO4 (1.0)
K3PO4 (0.5)
K3PO4 (0.5)
K3PO4 (0.5)
K3PO4 (0.5)
K3PO4 (0.5)
K3PO4 (0.5)
K3PO4 (0.5)
8
6
9
12
12
6
.
10
11
12
13
14
Cu(OAc)2 H2O (2.0)
AgOAc (2.0)
AgOAc (1.0)
AgOAc (2.0)
Cu(OAc)2 (2.0)
24
24
12
a
Reaction conditions: 6a (0.34 mmol), 2a or 2b (1.1-2.0 eqiv.), [RhCp*Cl2]2 (2.0 mol%), Oxidant (2 equiv.),
o
K3PO4 (0-1.0 eqiv.), solvent (3 mL), 100 C in sealed tube. b Product ratios were determined by using 1H-NMR
analysis of crude reaction mixtures, 7 & 8 are mixtures of cis and trans diastereomers. c isolated yield = 80%. d
isolated yield = 98%. e The reaction was carried out at 60 oC.
The results show that reaction of 6a with 2 eqiv. of methyl acrylate (2b) in the presence of [RhCp*Cl2]2,
and AgOAc as oxidant produces a mixture of 7ab (mono-olefinated and cyclized product) and 8ab (di-
olefinated and cyclized product) along with small amounts of uncyclized product 9ab. Moreover, the
ratio of 7ab:8ab:9ab are highly dependent on solvent. In toluene, 8ab is the major product (Table 1,
entry 1) while 7ab is generated as the major product in CH3CN solvent (Table 1, entry 3). The results
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of additional screening demonstrated that presence of the base, K3PO4, leads to a significant
improvement in the yield of mono-olefinated and cyclized product 7ab and a reduction in the amounts
of bis-olefinated and cyclized product 8ab (Table 1, entries 7 and 8). It is believed that K3PO4 facilitates
intramolecular cyclization of mono-olefinated intermediate 9ab to form 7ab and, hence, reduces bis-
olefination leading to 8ab (see discussion of mechanism below). Moreover, when sterically more bulky
benzyl acrylate (2a, 1.1 eqiv.) is employed as the olefin substrate, the mono-olefinated and cyclized
product 7a is formed exclusively in excellent yield (98%, Table 1, entry 11). Interestingly, in contrast
to reactions of the 5-membered cyclic sulfamates7 1 and 4 (Scheme 1), which produce only trans-1,3-
disubstituted isoindolines 3 and 5, respectively, oxidative olefination of the 6-membered cyclic
sulfamidate 6a generates a small amount of the cis-1,3-disubstituted isoindoline along with the trans-
1,3-isomer as a major product (trans-7a(97% ee):cis-7a(99% ee) = 6.2:1, Table 2, entry 1). The
decreased diastereoselectivity of the latter process is likely a consequence of the increased structural
flexibility of the 6-membered ring system in 7a compared to the structurally more rigid 5-membered
counterpart in 3 and 5. In addition, the diastereoselectivity of 7 (trans:cis ratio) might be resulted from
the themodynamic stability of trans-7a and cis-7a isomers. Actually, a small amount of pure cis-7a was
isolated and subjected to heating conditions in the presence of base (DBU, toluene, 110 oC) and, after 6
h, 7a was recovered quantitatively with trans-7a (trans:cis=6.6:1) as a major product. The absolute
stereochemistry of 7a was assigned by using X-ray crystallographic analysis of the carboxylic acid
derivative 10a (CCDC 1523356) generated from 7a by hydrogenolysis (Scheme 3). In addition, the
structures and stereochemistries of 7f (CCDC 1523015) and 7j (CCDC 1526196) were unambiguously
determined by using X-ray crystallographic analysis (see Table 2, entries 7 and 11, and SI).
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Scheme 3. X-ray crystal structure of trans-(S,R)-10a
Using the optimized reaction conditions, the sulfamidate scope of the oxidative tandem C-H olefination-
cyclization reactions with benzyl acrylate (2a) was investigated.
Table 2. Cyclic sulfamidate substrate scope of reactions with benzyl acrylate (2a)a
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substrate 6
product 7
yield
(%)d
substrate 6
product 7
yield
(%)d
entry
entry
(% ee)b
(% ee,b drc)
(% ee)b
(% ee,b drc)
1
98
12
86
6a(98.0%ee)
7a(97%ee, dr 6.2:1)
6k(98%ee)
7k(98%ee, dr 6:1)
2
98
13
90
ent-6a(99%ee)
ent-7a(97%ee, dr 5:1)
6l(97%ee)
7l(97%ee, dr 27.9:1)
3
4
5
90
92
92
14
15
16
87
82
84
6b(94%ee)
7b(94%ee, dr 3.4:1)
7ce(98%ee, dr 17:1)
7d(97%ee, 8:1)
6m(97%ee)
6n(99%ee)
7m(96%ee, dr 5.4:1)
7n(96%ee, dr 14.4:1)
6c(98%ee)
6d(97%ee)
6o(98%ee)
7o(97%ee, dr 3.9:1)
6
7
82
90
17
18
80
81
6e(97%ee)
6f(99%ee)
7e(96%ee, dr 7.9:1)
7ff(99%ee, dr >30:1)
6p(98%ee)
6q(98%ee)
7p(99%ee, dr 12.2:1)
7q(79%ee, dr 7.9:1)
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76
71
19
20
90
70
6r(97%ee)
6s(96%ee)
6g(99%ee)
6h(99%ee)
7g(95%ee, dr 4.7:1)
7h(89%ee, dr 6.2:1)
7r(97%ee, dr 6.5:1)
7s(97%ee, dr 3.8:1)
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10
11
80
71
21
22
53g
7i(84%ee, dr 15.5:1)
7jf(98%ee, 3.9:1)
6i(99%ee)
6j(98%ee)
6t(97%ee)
6u(86%ee)
7t(97%ee)
36h
7u(-)i
a Reaction conditions: 6a (0.38 mmol), 2a (0.42 mmol), [RhCp*Cl2]2 (2.0 mol%), AgOAc (0.76 mmol), K3PO4
(0.19 mmol), CH3CN, 100 oC in a sealed tube for 6-7 h. b ee and dr were determined by using chiral HPLC. c dr =
trans-7:cis-7. d Isolated yields of diastereomers after silica-gel chromatography. e Regiochemistry was identified
by using 2D-NOESY analysis (see, SI). f Structure and stereochemistry were determined by X-ray crystallography
analysis. 7f (CCDC 1523015), 7j (CCDC 1526196). g 3.0 eqiv. of benzyl acrylate without K3PO4 was used. h 3.0
eqiv. of methyl acrylate was used. i Enantiomers are inseparable
Inspection of the results displayed in Table 2 show that 6-membered cyclic sulfamidates 6 containing
various substituents, such as Cl, Br, F, Me, OMe, CF3, and CO2Me on either or both of the aryl rings (A
& B rings) undergo the process to produce the corresponding olefinated and cyclized products 7 in high
yields and with excellent levels of ee and good diasteroselectivites. Because halogen substituents (F, Cl,
Br) on the substrates 6 (6e-g, 6n-o, and 6r-s) are tolerated in this reaction, the corresponding products
can be further functionalized by using conventional metal-catalyzed cross coupling reactions (for
example, see Scheme 6, eq. 2). As exemplified by reactions of 6b, 6c and 6d, with respective ortho,
meta, para-Me on the A ring, and 6k, 6l and 6m (with resepctive ortho, meta, para-OMe on the B ring),
positions of the substituents on both aromatic rings of 6 have little effect on the reaction efficiencies
and enantiomeric excess of the products. However, cyclic sulfamidates having substituents on meta
position of A or B ring (6c and 6l) provided corresponding 7c and 7l with better diastereoselectivities
(for 7c, trans:cis = 17:1, for 7l, trans:cis = 14.4:1) than those of having ortho or para-substituents. It is
noteworthy that 6c and 6f, which possess meta-substituents on the A ring, react to generate 7c and 7f
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as exclusive products arising by regioselective activation of the sterically less hindered ortho C-H
position (Table 2, entries 4 and 7). The structure of 7c was determined by using 2D-NOE spectroscopy
and that of 7f utilizing X-ray crystallography (see SI). Reaction of 6j, which possesses a 2-naphthyl
ring also successfully produces 7j as a consequence of activation of the less hindered C(3)-H of naphthyl
ring (Table 2, entry 11). The structure of 7j was also determined by using X-ray crystallographic
analyses (see SI). In contrast, 6h, 6i and 6q, which contain strong electron-withdrawing groups such as
CF3 (6h, 6q) or CO2M (6i) at para-positions of the A or B rings react to form the corresponding products
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7h, 7i and 7q with decreased levels of ee (7h: 99→89% ee, 7i: 99→84% ee, 7q: 98→79% ee, Table 2,
entries 9, 10 and 18). We assume that the decreased enantioselectivities of these processes might be
caused by base-promoted partial racemization of bridgehead protons in 7h, 7i and 7q. To examine this
proposal, 7i (84% ee), which has an electron withdrawing CO2Me group on para-position of ring A,
was re-subjected to the optimized reaction conditions in the absence of benzyl acrylate (2a). After 6 h,
7i, recovered almost quantitatively, was found to have a 76% ee. Moreover, treatment of 7i (84% ee)
with DBU in refluxing toluene for 6 h led to recovered 7i with a 36% ee. In contrast, the ee of 7d (97%
ee), which contains a para-methyl substituent, is unchanged under the same conditions (97% ee, DBU,
toluene, reflux, 6 h) (Scheme 4).
Scheme 4. Base-promoted partial racemization of 7i and comparison with 7da
a Reaction conditions: 6i (0.1 mmol), [RhCp*Cl2]2 (2.0 mol%), AgOAc (0.2 mmol), K3PO4 (0.05 mmol), CH3CN,
100 oC in sealed tube for 6 h. ee and dr were determined by using chiral HPLC.
Finally, 6-membered cyclic sulfamidate derivatives possessing heterocyclic substituents such as
thiophene (6t) and furan (6u) react under the standard reaction conditions to form the respective
oxidative olefination products 7t (53%) and 7u (36%) exclusively, which do not undergo cyclization
even when excess amounts of benzyl or methyl acrylate (3 eqiv.) are used (Table 2, entries 21 and 22).
The alkene substrate scope of the process was investigated next using reactions of 2b-2g with (R)-6a
under the optimized reaction conditions. As shown in Table 3, not only benzyl but also methyl and tert-
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butyl acrylates serve as substrates for this transformation generating the corresponding adducts 7ab-
7ac with high efficiencies and stereoselectivities. Reaction of 6a with other activated olefins such as
phenyl vinyl sulfone (2d), methyl vinyl ketone (2e) and acrylonitrile (2f) also take place to form the
corresponding adducts 7ad-7af in good yields and high stereoselectivities. However, N,N-dimethyl
acrylamide 2g, branched acrylate 2h and internal olefin 2i does not undergo oxidative olefinations with
6a under the standard reaction conditions.
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Table 3. Alkene substrate scope of reactions with (R)-6aa
dr c
(trans-7:cis-7)
%eec
(for trans-7)
yield (%)b
entry
2a-2i
time (h)
product 7
7a
1
(2a)
6
98
6.2:1
4.6:1
9.9:1
10.5:1
16.5:1
8.8:1
-
98
99
98
97
98
98
-
CO2Bn
2
3
2b
80
70
73
64
85
-
(
)
7ab
7ac
7ad
7ae
7af
CO2Me
24
24
24
24
6
4
5
6
7d
7ag
24
8d
9
-
-
-
-
24
24
-
-
7ah
7ai
a Reaction conditions: 6a (0.19 mmol), 2 (0.21 mmol), [RhCp*Cl2]2 (2.0 mol%), AgOAc (200 mol%), K3PO4 (0.1
mmol), CH3CN, 100 oC in sealed tube for 6-24 h. b Isolated yields of diastereomers after silica-gel chromatography.
c ee and dr were determined by using chiral HPLC. d 2 eqiv. of olefins were used.
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The mechanism displayed in Scheme 5, which is based on the previously reported C-H
functionalization reactions of 5-membered cyclic sulfamidate7 and related C-H functionalization
7
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processes,4c,4e,11 is proposed for the reaction forming (S,R)-7a
.
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Scheme 5. Plausible mechanism
The pathway is initiated by coordination of Rh(III) to the sulfamidate nitrogen of 6a and
subsequent C-H activation at the ortho-position leading to the 5-membered rhodacycle
Coordination and migratory insertion of alkene 2a to then generates II and subsequent
hydride elimination of II forms olefinated product ( )-9a via intermediate III with concomitant
release of a Rh(I) species that is reoxidized to the Rh(III) by the action of AgOAc. The formed
intermediate ( )-9a undergoes K3PO4 promoted cyclization to generate the thermodynamically
more stable trans-(S,R)-7a as the major product accompanied by a different amount of cis-(R,R)-
7a trans-7a cis-7a = 6.2:1, Table 3, entry 1). Actually, treatment of independently synthesized
)-9a with K3PO4 in CH3CN results in formation of cyclized product (S,R)-7a in 80% yield
trans cis=5.9:1). But, when ( )-9a is subjected to the same reaction conditions in the absence
I
.
I
-
R
R
(
:
(
(
R
:
R
of K3PO4, the yield of (S,R)-7a is only 33% (trans:cis = 4.5:1).
The isoindoline-fused-1,3-sulfamidates 7, produced in the process described above can be transformed
to more complex substances. For example, 7a is converted to the 1,3-disubstituted isoindoline 12 via
Ni-catalyzed Kumada coupling with MeMgBr (Scheme 6, eq. 1).9b In addition, 7f is transformed to the
biphenyl derivative 13 via Pd-catalyzed Suzuki coupling with phenyl boronic acid (Scheme 6, eq. 2).
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Scheme 6. Transformations of 7a
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a Reaction conditions: (i) 10% Pd/C (10% wt/wt), H2 (g), MeOH, rt, 12 h. (ii) diethyl amine, EDCI∙HCl, HOBt,
DCM, rt, 12 h. (iii) MeMgBr, cat. Ni(dppp)Cl2 (5 mol%), ether, 55 C, 16 h; HCl in MeOH, 55 C, 6 h. (iv)
PhB(OH)2, Pd(PPh3)2Cl2 (4 mol%), Na2CO3, dioxane/H2O (3:1)
o
o
CONCLUSION
In the effort described above, we developed a tandem Rh(III)-catalyzed oxidative C-H olefination and
intramolecular aza-Michael cyclization reaction that transforms 4-aryl-benzo-1,3-sulfamidates 6 to
benzosulfamidate-fused-trans-1,3-isoindolines 7. The process serves as a direct and stereoselective
method for synthesis of highly functionalized benzosulfamidate-fused trans-1,3-isoindolines from
enantiomerically enriched 4-aryl-benzo-1,3-sulfamidates. A wide number of sulfamidates, containing a
variety of functional groups on both aryl rings, and activated olefins participate in this process. The
configurational integrity of the chiral center in the starting cyclic sulfamidates 6 is retained in the
product and the process generates the trans-isomers as major products. Finally, examples are provided
that show the isoindoline-fused-1,3-sulfamidates 7 produced in this process can be further transformed
to more complex substances.
EXPERIMENTAL SECTION
General
All commercial reagents were used as obtained unless otherwise noted. Reactions were performed using
oven dried glassware. Flash column chromatography was carried out on silica gel (38-75 μm).
Analytical thin layer chromatography (TLC) was performed on silica gel 60 F254 plates. Preparative thin
later chromatography (PLC) was performed on silica gel 60 F254 2 mm plates. Visualization of the
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developed chromatogram was accomplished with UV light and by staining with Potassium
Permanganate (KMnO4) solution followed by heating. Nuclear magnetic resonance (NMR) spectra
were recorded using 500 MHz NMR instrument (1H NMR at 500 MHz and 13C NMR at 125 MHz) or
300 MHz NMR instrument (1H NMR at 300 MHz and 13C NMR at 75 MHz). 1H NMR data are reported
as follows: chemical shift (δ, ppm), multiplicity (s = singlet, d = doublet, t = triplet, q = quartet, m =
multiplet, br = broad), integration, coupling constants (Hz). Data for 13C NMR are reported in terms of
chemical shift (δ, ppm). High performance liquid chromatography (HPLC) was carried out on a HPLC
system (7725i Injector, SDV 30 Plus Solvent Degassor & Valve Module (Helium Sparging), SP930D
Solvent Delivery Pump, UV 730D Absorbance Detector) equipped with Chiralpak (IA, IB, IC, ID, OD,
AD-H and OD-H) columns. Specific rotations were measured on a Rudolph Autopol IV (Automatic
polarimeter). High-resolution mass spectra and elemental analysis were obtained from the Center for
Chemical Analysis of Korea Research Institute of Chemical Technology. HR-MS were measured with
electron impact (EI) ionization or fast atom bombardment (FAB) ionization via double focusing mass
analyzer (magnetic and electric fields).
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Representative Procedure for the Stereoselective Synthesis of benzo-1,3-sulfamidate 6
Method A: 6a and 6c~6u (modified from reported procedure)9
To a solution of cyclic aldimine (50 mg, 0.27 mmol), [Rh(COE)2Cl2] (3.0 mg, 1.5 mol%), chiral ligand-
E (2.7 mg, 3.3 mol%), and ArB(OH)2 (111 mg, 0.82 mmol) in toluene was stirred at rt for 30 min then
o
1.5 M aqueous KHF2 (0.55 mL, 0.82 mmol) was added. The mixture was stirred at 100 C for 4 h,
quenched with water, and extracted with EtOAc. The organic layer was dried over Na2SO4, evaporated
under vacuum, and purified on silica gel column chromatography using EA/hexanes (1/1 to 2/1) as
eluent to afford title compound.
Method B10: 6b
To a solution of cyclic sulfamidate imine (100 mg, 0.37 mmol) in EtOAc (3.7 mL) was added (S,S)-
ClRhCp*[TsDPEN] (1.2 mg, 0.5 mol%) followed by the dropwise addition of HCOOH:Et3N (1:1
mixture, 0.37 mL) under nitrogen atmosphere. The reaction mixture was stirred at rt for 4 h and
quenched with NaHCO3 (aq). The mixture was extracted with EtOAc and washed with H2O followed
by saturated NaCl (aq). The organic layer was dried over MgSO4 and evaporated under vacuum. The
crude residue was purified on silica gel column chromatography using EA/hexane (1/1 to 2/1) as an
eluent to afford title compound as a white solid.
6a~6h, 6j~6m, 6o are known compounds.9
6i: Methyl (R)-4-(2,2-dioxido-3,4-dihydrobenzo[e][1,2,3]oxathiazin-4-yl)benzoate
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o
Yield: 95% (145.0 mg as a white solid); mp: 185.5~190.8 C; 99% ee
(Chiralpak AD-H, 20% IPA/n-hexanes, 1.0 ml/min, 215nm, tR(major) = 12.6
6
7
8
1
min, tR(minor) = 11.9 min); []D 21 = -5.50 (c 0.2, CHCl3).; H NMR (500
9
MHz, CDCl3) δ 8.11 (d, J = 8.1 Hz, 2H), 7.47-7.45 (m, 2H), 7.38-7.36 (m,
1H), 7.14 (t, J = 7.8 Hz, 2H), 6.81 (d, J = 7.7 Hz, 1H), 5.99 (d, J = 8.4 Hz, 1H), 4.90 (d, J = 8.4 Hz,
1H), 3.96 (s, 3H).; 13C NMR (125 MHz, CDCl3) δ 166.2, 151.5, 142.4, 131.3, 130.7, 130.0, 128.9, 128.4,
125.4, 121.3, 119.1, 61.5, 52.4.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C15H13NO5S
319.0514; found 319.0517.
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6n: (R)-8-chloro-4-phenyl-3,4-dihydrobenzo[e][1,2,3]oxathiazine 2,2-dioxide
Yield: 88% (120 mg as a white solid); mp: 149.3-151.8 oC; 99% ee (Chiralpak IB,
10% EtOH/n-hexanes, 1.1 ml/min, 215nm, tR(major) = 9.5 min, tR(minor) = 8.5
min); []D 27 = +2.33 (c 0.1, CHCl3).; 1H NMR (300 MHz, CDCl3) δ 7.54-7.42 (m,
3H), 7.43-7.28 (m, 3H), 7.04 (t, J = 7.9 Hz, 1H), 6.75 (d, J = 7.9 Hz, 1H), 5.92 (d,
J = 8.7 Hz, 1H), 5.10 (d, J = 8.7 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 147.4, 137.4, 130.4, 129.8,
129.6, 128.8, 126.9, 125.1, 124.0, 123.8, 62.1.; HRMS (EI, double focusing) m/z: [M]+ Calcd for
C13H10ClNO3S 295.0070; found 295.0080.
6p: Methyl (R)-4-phenyl-3,4-dihydrobenzo[e][1,2,3]oxathiazine-6-carboxylate-2,2-dioxide
o
Yield: 80% (105.0 mg as a white solid); mp: 113.0-115.3 C; 98% ee (Chiralpak
AD-H, 30% EtOH/n-hexanes, 1.0 ml/min, 215nm, tR(major) = 9.50 min, tR(minor)
1
= 6.42 min); []D 20 = -4.40 (c 0.5, CHCl3).; H NMR (500 MHz, CDCl3) δ 8.01
(dd, J =2.0, 8.7 Hz, 1H), 7.55 (t, J = 1.4 Hz, 1H), 7.46-7.44 (m, 3H), 7.34-7.32 (m,
2H), 7.14 (d, J = 8.7 Hz, 1H), 5.93 (d, J = 8.6 Hz, 1H), 4.77 (d, J = 8.5 Hz, 1H),
3.83 (s, 3H).; 13C NMR (125 MHz, CDCl3) δ 165.5, 154.7, 137.2, 131.1, 130.4, 129.9, 129.7, 128.8,
127.3, 122.1, 119.2, 61.9, 52.4.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C15H13NO5S
319.0514; found 319.0511.
6q: (R)-4-phenyl-7-(trifluoromethyl)-3,4-dihydrobenzo[e][1,2,3]oxathiazine 2,2-dioxide
Yield: 77% (50.0 mg as a yellow oil); 98% ee (Chiralpak AD-H, 30% IPA/n-
O O
S
hexanes, 0.8 ml/min, 215nm, tR(major) = 5.78 min, tR(minor) = 6.93 min); []D
HN
O
29 = +5.55 (c 0.2, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.49 (s, 3H), 7.39-7.37
(m, 4H), 7.01 (d, J = 7.6 Hz, 1H), 5.97 (s, 1H), 4.83 (s, 1H).; 13C NMR (125 MHz,
CF3
CDCl3) δ 151.5, 137.0, 132.3 (q, JCF = 35.5 Hz), 130.0, 129.8, 129.5, 128.7, 125.9, 124.1, 121.8 (d, JCF
= 6.9 Hz), 116.5 (q, JCF = 3.9 Hz), 61.9.; HRMS (EI, double focusing) m/z: [M]+ Calcd for
C14H10F3NO3S 329.0333; found 329.0306.
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6r: (R)-6-chloro-4-(p-tolyl)-3,4-dihydrobenzo[e][1,2,3]oxathiazine 2,2-dioxide
Yield: 88% (100 mg as a colorless oil); 97% ee (Chiralpak AD-H, 30% EtOH/n-
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7
8
21
hexanes, 1.0 ml/min, 215nm, tR(major) = 6.61 min, tR(minor) = 5.45 min); []D
= +59.8 (c 0.5, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.33-7.28 (m, 3H), 7.23
(d, J = 8.1 Hz, 2H), 7.05 (d, J = 8.8 Hz, 1H), 6.84 (d, J = 1.8 Hz, 1H), 5.85 (d, J
= 8.6 Hz, 1H), 4.68 (d, J = 8.8 Hz, 1H), 2.43 (s, 3H).; 13C NMR (125 MHz, CDCl3)
δ 150.0, 140.1, 134.1, 130.5, 130.4, 129.9, 128.6, 128.3, 123.8, 120.3, 61.6, 21.3.; HRMS (EI, double
focusing) m/z: [M]+ Calcd for C14H12ClNO3S 309.0226; found 309.0212.
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6s: (R)-4-(4-cholorophenyl)-6-methoxy-3,4-dihydrobenzo[e][1,2,3]oxathiazine-2,2-dioxide
Yield: 92% (140.0 mg as a colorless oil); 96% ee (Chiralpak AD-H, 30% EtOH/n-
O O
S
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hexanes, 1.0 ml/min, 215nm, tR(major) = 9.63 min, tR(minor) = 7.48 min); []D
HN
O
= +48.8 (c 0.5, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.41 (d, J = 8.4 Hz, 2H),
7.30 (d, J = 8.4 Hz, 2H), 7.01 (d, J = 9.0 Hz, 1H), 6.87 (dd, J =9.0, 2.9 Hz, 1H),
6.27 (d, J = 2.8 Hz, 1H), 5.83 (d, J = 8.5 Hz, 1H), 4.68 (d, J = 8.5 Hz, 1H), 3.67
Cl
O
(s, 3H).; 13C NMR (125 MHz, CDCl3) δ 156.6, 145.3, 136.2, 135.7, 130.2, 129.7, 122.2, 120.0, 115.4,
113.1, 61.4, 55.7.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C14H12ClNO4S 325.0176; found
325.0155.
6t: (S)-4-(thiophen-2-yl)-3,4-dihydrobenzo[e][1,2,3]oxathiazine 2,2-dioxide
Yield: 84% (122.0 mg as a white solid); mp: 117.5-120.7 oC; 97% ee (Chiralpak IC,
10% IPA/n-hexanes, 0.8 ml/min, 215nm, tR(major) = 17.9 min, tR(minor) = 19.8 min);
[]D 20 = +92.4 (c 0.2, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.44-7.38 (m, 2H), 7.20-
7.16 (m, 2H), 7.12-7.08 (m, 3H), 6.25 (d, J = 8.6 Hz, 1H), 4.75 (d, J = 8.5 Hz, 1H).;
13C NMR (125 MHz, CDCl3) δ 150.9, 140.1, 130.2, 128.8, 128.5, 127.6, 127.3, 125.3, 121.6, 118.9,
57.0.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C11H9NO3S2 267.0024; found 267.0015.
6u: (S)-4-(furan-2-yl)-3,4-dihydrobenzo[e][1,2,3]oxathiazine 2,2-dioxide
Yield: 89% (122.0 mg as a yellow solid); mp: 94.4-98.1 oC; 86% ee (Chiralpak IC, 10%
IPA/n-hexanes, 0.8 ml/min, 215nm, tR(major) = 21.5 min, tR(minor) = 20.6 min); []D
20 = +15.5 (c 0.5, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.48 (d, J = 1.5 Hz, 1H), 7.38
(t, J = 7.7 Hz, 1H), 7.16 (t, J = 7.5 Hz, 1H), 7.11 (d, J = 8.3 Hz, 1H), 6.95 (d, J = 7.8
Hz, 1H), 6.48 (dd, J = 3.2, 1.9 Hz, 1H), 6.05 (d, J = 9.5 Hz, 1H), 4.96 (d, J = 9.5 Hz, 1H).; 13C NMR
(125 MHz, CDCl3) δ 151.0, 140.2, 130.3, 128.9, 128.6, 127.7, 127.4, 125.4, 121.7, 119.0, 57.1.; HRMS
(EI, double focusing) m/z: [M]+ Calcd for C11H9NO4S 251.0252; found 251.0246.
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General procedure for the oxidative olefination-cyclization of 6 to 7
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A 20 mL sealed tube equipped with a magnetic stirring bar was charged with benzo-1,3-sulfamidate 6a
(100 mg, 0.34 mmol), [RhCp*Cl2]2 (4.2 mg, 2.0 mol%), AgOAc (115 mg, 0.69 mmol), benzyl acrylate
(61 mg, 0.38 mmol), K3PO4 (36 mg, 0.17 mmol) and 3 mL of anhydrous MeCN. The reaction tube was
capped and stirred at 100 ℃ (bath temperature). When the starting material was consumed completely
(monitored by TLC), the tube was cooled to room temperature. The mixture was diluted with EtOAc
and filtered through a celite pad. The solvents and the volatiles were evaporated under reduced pressure
followed by the purification through flash column chromatography using EtOAc /hexanes (1/5 to 1/3)
as an eluent to afford title compounds as diastereomeric mixture (determined by chiral HPLC
chromatography).
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7a: Yield 98% (158 mg as a colorless oil, trans:cis=6.2:1).
trans-(S,R)-7a:
Benzyl-2-((8S,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
a]isoindol-8-yl)acetate
o
White solid, mp: 87.1-89.2 C; 97% ee (Chiralpak AD-H, 20% IPA/n-hexanes,
1.0 ml/min, 215nm, tR(major) = 20.8 min, tR(minor) = 23.5 min); []D 22 = +68.9
(c 0.7, CHCl3).; 1H NMR (300 MHz, CDCl3) δ 7.56 (d, J = 7.6 Hz, 1H), 7.49 (d,
J = 8.0 Hz, 1H), 7.43-7.30 (m, 7H), 7.27-7.19 (m, 1H), 7.16 (d, J = 7.7 Hz, 1H),
7.04 (dd, J = 8.0, 1.4 Hz, 1H), 6.26 (s, 1H), 5.54 (d, J = 7.5 Hz, 1H), 5.19 (s, 2H), 3.43 (dd, J = 16.6,
3.3 Hz, 1H), 3.06 (dd, J = 16.6, 7.8 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.1, 149.8, 138.6, 135.5,
129.2, 129.2, 128.9, 128.6, 128.5, 128.4, 126.5, 125.8, 123.0, 122.2, 119.3, 67.3, 63.1, 41.2.; HRMS
(EI, double focusing) m/z: [M]+ Calcd for C23H19NO5S 421.0984; found 421.0966.
cis-(R,R)-7a:
a]isoindol-8-yl)acetate
Colorless oil, >99% ee (Chiralpak AD-H, 20% IPA/n-hexanes, 1.0 ml/min,
Benzyl-2-((8R,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
215nm, tR(major) = 13.1 min); []D 22 = -86.3 (c 0.3, CHCl3).; 1H NMR (300 MHz,
CDCl3) δ 7.69 (d, J = 7.5 Hz, 1H), 7.53 (d, J = 7.8 Hz, 1H), 7.45 (t, J = 7.6 Hz,
1H), 7.39-7.30 (m, 7H), 7.24-7.17 (m, 2H), 7.03 (dd, J = 8.2, 1.2 Hz, 1H), 6.24 (s,
1H), 5.58 (dd, J = 10.8, 3.4 Hz, 1H), 5.14 (s, 2H), 3.64 (dd, J = 15.6, 3.5 Hz, 1H), 2.35 (dd, J = 15.6,
10.9 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.8, 150.4, 139.7, 137.2, 135.2, 129.6, 129.1, 128.8,
128.6, 128.5, 126.0, 125.5, 123.8, 123.7, 121.4, 119.1, 66.8, 65.3, 62.9, 38.1.; HRMS (EI, double
focusing) m/z: [M]+ Calcd for C23H19NO5S 421.0984; found 421.0956.
ent-7a: Yield 98% (78.0 mg as a colorless oil, trans:cis=5:1).
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trans-(R,S)-7a:
a]isoindol-8-yl)acetate
Colorless oil, 97% ee (Chiralpak AD-H, 20% IPA/n-hexanes, 1.0 ml/min, 215nm,
Benzyl-2-((8R,12bS)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
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tR(major) = 23.8 min, tR(minor) = 21.1 min); []D = 62.2 (c 0.2, CHCl3).; H
NMR (500 MHz, CDCl3) δ 7.56 (d, J = 7.7 Hz, 1H), 7.49 (d, J = 7.7 Hz, 1H),
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7.41-7.36 (m, 9H), 7.22 (t, J = 7.6 Hz, 1H), 7.16 (d, J = 7.7 Hz, 1H), 7.05 (d, J =
8.1, 1H), 6.26 (s, 1H), 5.54 (d, J = 7.4 Hz, 1H), 5.19 (s, 2H), 3.43 (dd, J = 16.6, 3.2 Hz, 1H), 3.06 (dd,
J = 16.6, 7.9 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.1, 149.8, 138.6, 137.7, 135.5, 129.2, 129.1,
128.5, 128.4, 126.4, 125.8, 122.9, 122.8, 122.2, 119.3, 67.2, 66.7, 63.1, 41.2.; HRMS (EI, double
focusing) m/z: [M]+ Calcd for C23H19NO5S 421.0984; found 421.0981.
7b: Yield 90% (142 mg as a colorless oil, trans:cis=3.4:1).
trans-(S,R)-7b:
Benzyl-2-((8S,12bR)-12-methyl-6,6-dioxido-8,12b-
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 94% ee (Chiralpak AD-H, 10% EtOH/n-hexanes, 0.5 ml/min,
BnO2C
O O
S
22
O
215nm, tR(major) = 29.9 min, tR(minor) = 22.8 min); []D = -52.2 (c 0.5,
N
1
CHCl3).; H NMR (500 MHz, CDCl3) δ 7.41-7.30 (m, 5H), 7.25-7.20 (m, 3H),
7.14 (t, J = 7.6 Hz, 1H), 7.08 (d, J = 8.2 Hz, 1H), 6.94 (d, J = 6.9 Hz, 1H), 6.35
(s, 1H), 5.32 (dd, J = 7.8, 2.8 Hz, 1H), 5.24-5.18 (m, 2H), 3.54 (dd, J = 17.0, 3.2 Hz, 1H), 2.95 (dd, J =
17.0, 8.0 Hz, 1H), 2.66 (s, 3H).; 13C NMR (125 MHz, CDCl3) δ 170.4, 149.9, 140.2, 136.6, 135.5, 131.8,
130.6, 129.5, 129.2, 128.6, 128.4, 128.3, 127.2, 125.7, 121.3, 120.4, 118.9, 66.7, 66.2, 62.0, 40.0, 20.5.;
HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H21NO5S 435.1140; found 435.1128.
cis-(R,R)-7b:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 94% ee (Chiralpak AD-H, 10% EtOH/n-hexanes, 0.5 ml/min,
Benzyl-2-((8R,12bR)-12-methyl-6,6-dioxido-8,12b-
22
215nm, tR(major) = 16.9 min, tR(minor) = 21.3 min); []D = -98.9 (c 0.2,
1
CHCl3).; H NMR (300 MHz, CDCl3) δ 7.38-7.30 (m, 6H), 7.25-7.03 (m, 6H),
6.26 (s, 1H), 5.51 (dd, J = 11.0, 3.4 Hz, 1H), 5.32-5.01 (m, 2H), 3.46 (dd, J = 15.6,
3.4 Hz, 1H), 2.64 (s, 3H), 2.19 (dd, J = 15.5, 11.1 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.8, 150.8,
140.3, 136.5, 135.2, 132.8, 130.6, 129.9, 129.2, 128.7, 128.6, 128.5, 126.5, 125.3, 122.0, 121.4, 118.8,
66.8, 63.9, 63.0, 37.5, 20.5.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H21NO5S 435.1140;
found 435.1120.
7c: Yield 92% (145 mg as a colorless oil, trans:cis=17:1).
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trans-(S,R)-7c:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 98% ee (Chiralpak IC, 5% EtOH/n-hexanes, 0.8 ml/min, 215nm,
Benzyl-2-((8S,12bR)-11-methyl-6,6-dioxido-8,12b-
tR(major) = 38.4 min, tR(minor) = 24.1 min); []D 21 = +12.6 (c 0.8, CHCl3).; 1H
NMR (500 MHz, CDCl3) δ 7.49 (d, J = 7.7 Hz, 1H), 7.41-7.28 (m, 7H), 7.28-7.22
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(m, 1H), 7.11 (d, J = 7.9 Hz, 1H), 7.05-7.02 (m, 2H), 6.21 (s, 1H), 5.50 (d, J = 7.5
Hz, 1H), 5.19 (d, J = 1.4 Hz, 2H), 3.40 (dd, J = 16.5, 3.3 Hz, 1H), 3.03 (dd, J = 16.5, 7.8 Hz, 1H), 2.42
(s, 3H).; 13C NMR (125 MHz, CDCl3) δ 170.1, 149.8, 138.9, 137.8, 135.7, 135.5, 130.1, 129.1, 128.6,
128.5, 128.3, 126.5, 125.8, 123.3, 122.7, 122.4, 119.2, 67.2, 66.7, 63.0, 41.2, 21.5.; HRMS (EI, double
focusing) m/z: [M]+ Calcd for C24H21NO5S 435.1140; found 435.1130.
cis-(R,R)-7c:
Benzyl-2-((8R,12bR)-11-methyl-6,6-dioxido-8,12b-
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 91% ee (Chiralpak IC, 5% EtOH/n-hexanes, 0.8 ml/min, 215nm,
tR(major) = 22.4 min, tR(minor) = 19.7 min); []D 21 = +4.50 (c 1.2, CHCl3).; 1H
NMR (300 MHz, CDCl3) δ 7.55-7.52 (m, 1H), 7.48 (s, 1H), 7.39-7.32 (m, 6H),
7.23-7.18 (m, 1H), 7.10 (s, 2H), 7.03 (dd, J = 8.2, 1.2 Hz, 1H), 6.18 (s, 1H), 5.53
(dd, J = 10.8, 3.5 Hz, 1H), 5.18-5.08 (m, 2H), 3.62 (dd, J = 15.5, 3.5 Hz, 1H), 2.47 (s, 3H), 2.33 (dd, J
= 15.5, 10.8 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.1, 149.8, 138.9, 137.8, 135.7, 135.5, 130.1,
129.1, 128.6, 128.5, 128.3, 126.5, 125.8, 123.3, 122.7, 122.4, 119.2, 67.2, 66.7, 63.0, 41.3, 21.5.; HRMS
(EI, double focusing) m/z: [M]+ Calcd for C24H21NO5S 435.1140; found 435.1134.
7d: Yield 92% (145 mg as a colorless oil, trans:cis=8:1).
trans-(S,R)-7d:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 97% ee (Chiralpak IC, 20% IPA/n-hexanes, 1.0 ml/min, 215nm,
Benzyl-2-((8S,12bR)-10-methyl-6,6-dioxido-8,12b-
tR(major) = 38.6 min, tR(minor) = 16.9 min); []D 22 = +39.2 (c 0.4, CHCl3).; 1H
NMR (300 MHz, CDCl3) δ 7.49-7.42 (m, 2H), 7.38 (s, 5H), 7.31-7.23 (m, 1H),
7.21-7.17 (m, 1H), 7.03 (dd, J = 8.0, 1.4 Hz, 1H), 6.93 (s, 1H), 6.23 (s, 1H), 5.51
(d, J = 7.8 Hz, 1H), 5.21 (s, 2H), 3.43 (dd, J = 16.6, 3.2 Hz, 1H), 3.03 (dd, J = 16.6, 7.9 Hz, 1H), 2.29
(s, 3H).; 13C NMR (125 MHz, CDCl3) δ 170.1, 149.8, 139.4, 138.7, 135.6, 134.9, 129.7, 129.1, 128.6,
128.4, 126.4, 125.8, 123.4, 122.5, 119.2, 67.1, 66.7, 63.1, 41.3, 21.3.; HRMS (EI, double focusing) m/z:
[M]+ Calcd for C24H21NO5S 435.1140; found 435.1124.
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cis-(R,R)-7d:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 96% ee (Chiralpak IC, 20% IPA/n-hexanes, 1.0 ml/min, 215nm,
Benzyl-2-((8R,12bR)-10-methyl-6,6-dioxido-8,12b-
tR(major) = 21.5 min, tR(minor) = 14.9 min); []D 22 = -113.8 (c 0.2, CHCl3).; 1H
NMR (300 MHz, CDCl3) δ 7.55 (d, J = 7.8 Hz, 1H), 7.50 (d, J = 7.8 Hz, 1H),
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7.40-7.30 (m, 6H), 7.26-7.16 (m, 2H), 7.04-7.01 (m, 2H), 6.19 (s, 1H), 5.54 (dd,
J = 10.9, 3.4 Hz, 1H), 5.15 (s, 1H), 3.63 (dd, J = 15.6, 3.5 Hz, 1H), 2.38-2.33 (m, 1H), 2.29 (s, 1H).;
13C NMR (125 MHz, CDCl3) δ 169.8, 150.4, 139.8, 139.2, 135.3, 134.3, 129.6, 129.5, 128.6, 128.5,
126.0, 125.4, 124.1, 123.5, 121.7, 119.1, 66.7, 65.1, 62.8, 38.2, 21.4.; HRMS (EI, double focusing) m/z:
[M]+ Calcd for C24H21NO5S 435.1140; found 435.1121.
7e: Yield 82% (128 mg as a colorless oil, trans:cis=7.9:1).
trans-(S,S)-7e:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
White solid, mp: 128.1-130.3 oC; 96% ee (Chiralpak AD-H, 10% IPA/n-hexanes,
Benzyl-2-((8S,12bS)-12-fluoro-6,6-dioxido-8,12b-
0.8 ml/min, 215nm, tR(major) = 12.0 min, tR(minor) = 14.6 min); []D 21 = +309.9
(c 0.7, CHCl3).; 1H NMR (300 MHz, CDCl3) δ 7.66 (d, J = 7.6 Hz, 1H), 7.43-7.33
(m, 5H), 7.31-7.19 (m, 3H), 7.13-7.04 (m, 2H), 6.95 (d, J = 7.7 Hz, 1H), 6.51 (s,
1H), 5.48 (d, J = 7.4 Hz, 1H), 5.20 (s, 2H), 3.48 (dd, J = 16.8, 3.0 Hz, 1H), 3.04 (dd, J = 16.8, 8.0 Hz,
1H).; 13C NMR (125 MHz, CDCl3) δ 157.9, 155.9, 149.6, 142.33, 142.30, 135.4, 131.4, 131.3, 129.5,
128.6, 128.5, 128.4, 127.5, 127.4, 126.2, 124.9, 124.7, 121.5, 119.1, 118.9, 118.8, 116.1, 115.9, 66.8,
65.6, 62.8, 40.6.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C23H18FNO5S 439.0890; found
439.0880.
cis-(R,S)-7e:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 99% ee (Chiralpak AD-H, 10% IPA/n-hexanes, 0.8 ml/min, 215nm,
Benzyl-2-((8R,12bS)-12-fluoro-6,6-dioxido-8,12b-
tR(major) = 10.1 min, tR(minor) = 10.9 min); []D 20 = -121.9 (c 0.1, CHCl3).; 1H
NMR (300 MHz, CDCl3) δ 7.64 (d, J = 7.7 Hz, 1H), 7.39-7.29 (m, 7H), 7.27-7.14
(m, 2H), 7.05-7.02 (m, 2H), 6.47 (s, 1H), 5.56 (dd, J = 11.1, 3.4 Hz, 1H), 5.14 (d,
J = 2.4 Hz, 2H), 3.63 (dd, J = 15.7, 3.4 Hz, 1H), 2.36 (dd, J = 15.7, 11.1 Hz, 1H).; 13C NMR (125 MHz,
CDCl3) δ 169.6, 158.4, 156.5, 150.3, 143.0, 135.1, 131.4, 131.3, 129.9, 128.7, 128.64, 128.60, 127.1,
127.0, 126.0, 124.6, 124.4, 121.3, 119.8, 119.7, 119.0, 116.1, 116.0, 66.9, 63.8, 63.0, 37.7, 29.7.; HRMS
(EI, double focusing) m/z: [M]+ Calcd for C23H18FNO5S 439.0890; found 439.0860.
7f: Yield 90% (113 mg as a colorless oil, trans:cis=99.8:0.2).
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trans-(S,R)-7f:
Benzyl-2-((8S,12bR)-11-bromo-6,6-dioxido-8,12b-
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
6
7
8
9
White solid, mp: 133.2-135.5 oC; 99% ee (Chiralpak AD-H, 40% IPA/n-hexanes,
BnO2C
O O
S
0.8 ml/min, 215nm, tR(major) = 11.6 min, tR(minor) = 14.8 min); []D 22 = -118.9
(c 0.1, CHCl3).; 1H NMR (300 MHz, CDCl3) δ 7.64 (s, 1H), 7.43-7.29 (m, 7H),
7.25 (dd, J = 7.4, 1.5 Hz, 1H), 7.07-7.00 (m, 2H), 6.19 (s, 1H), 5.45 (d, J = 7.7
O
N
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Br
Hz, 1H), 5.17 (s, 2H), 3.39 (dd, J = 16.7, 3.1 Hz, 1H), 3.05 (dd, J = 16.7, 7.7 Hz, 1H).; 13C NMR (125
MHz, CDCl3) δ 169.8, 149.8, 139.8, 137.6, 135.4, 132.4, 129.5, 128.6, 128.5, 128.4, 126.3, 126.1, 126.0,
124.6, 122.6, 121.6, 119.4, 66.84, 66.80, 62.8, 40.9.; HRMS (EI, double focusing) m/z: [M]+ Calcd for
C23H18 BrNO5S 499.0089; found 499.0091.
7g: Yield 76% (100 mg as a colorless oil, trans:cis=4.7:1).
trans-(S,R)-7g:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Orange oil, 95% ee (Chiralpak IA, 5% IPA/n-hexanes, 0.7 ml/min, 215nm,
Benzyl-2-((8S,12bR)-10-bromo-6,6-dioxido-8,12b-
tR(major) = 65.1 min, tR(minor) = 52.1 min); []D 19 = +13.7 (c 0.1, CHCl3).; 1H
NMR (500 MHz, CDCl3) δ 7.51 (dd, J = 8.3, 1.8 Hz, 1H), 7.43-7.35 (m, 8H),
7.33-7.30 (m, 1H), 7.25-7.22 (m, 1H), 7.05 (dd, J = 8.2, 1.3 Hz, 1H), 6.20 (s, 1H),
5.50 (d, J = 7.7 Hz, 1H), 5.20 (s, 2H), 3.41 (dd, J = 16.9, 3.0 Hz, 1H), 3.07 (dd, J = 16.9, 7.9 Hz, 1H).;
13C NMR (125 MHz, CDCl3) δ 169.8, 149.7, 140.8, 136.8, 135.3, 132.1, 129.4, 128.7, 128.5, 126.3,
126.2, 126.0, 124.3, 123.2, 121.7, 119.4, 66.9, 66.8, 62.7, 40.9.; HRMS (EI, double focusing) m/z: [M]+
Calcd for C23H18 BrNO5S 499.0089; found 499.0099.
7h: Yield 71% (106 mg as a colorless oil, trans:cis=6.2:1).
trans-(S,R)-7h:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Brown oil, 89% ee (Chiralcel OD-H, 5% IPA/n-hexanes, 1.0 ml/min, 215nm,
Benzyl-2-((8S,12bR)-6,6-dioxido-10-(trifluoromethyl)-8,12b-
tR(major) = 25.3 min, tR(minor) = 22.9 min); []D 19 = +235.0 (c 0.2, CHCl3).;
1H NMR (500 MHz, CDCl3) δ 7.68-7.65 (m, 2H), 7.51 (s, 1H), 7.47 (d, J = 7.7
Hz, 1H), 7.41-7.32 (m, 5H), 7.27-7.24 (m, 1H), 7.07 (d, J = 8.2 Hz, 1H), 6.31
(s, 1H), 5.57 (d, J = 7.7 Hz, 1H), 5.22-5.16 (m, 2H), 3.45 (dd, J = 16.9. 3.0 Hz, 1H), 3.12 (dd, J = 16.9,
7.8 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.8, 149.9, 141.6, 139.7, 135.3, 131.8 (q, JCF = 32.7 Hz),
128.7, 128.5, 128.4, 126.3, 126.2 (d, JCF = 3.8 Hz), 126.1, 123.5, 123.1 (q, JCF = 270.0 Hz), 121.3, 120.3
(q, JCF = 3.8 Hz), 119.5, 67.1, 66.9, 62.9, 40.8.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H18
F3NO5S 489.0858; found 489.0834.
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7i: Yield 80% (120 mg as a colorless oil, trans:cis=15.5:1).
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trans-(S,R)-7i:
Methyl-(8S,12bR)-8-(2-(benzyloxy-2-oxoethyl)-8,12b-
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindole-10-carboxylate 6,6 dioxide
9
yellow oil, 84% ee (Chiralpak AD-H, 30% EtOH/n-hexanes, 1.0 ml/min,
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215nm, tR(major) = 42.9 min, tR(minor) = 24.7 min); []D 20 = +2.67 (c 0.3,
CHCl3).; 1H NMR (500 MHz, CDCl3) δ 8.08 (d, J = 8.2 Hz, 1H), 7.91 (s, 1H),
7.62 (d, J = 8.1 Hz, 1H), 7.47 (d, J = 7.7 Hz, 1H) 7.39-7.30 (m, 6H), 7.26-
7.23 (m, 1H), 7.06 (d, J = 8.1 Hz, 1H), 6.27 (s, 1H), 5.54 (d, J = 6.9 Hz, 1H), 5.17 (s, 2H), 3.93 (s, 3H),
3.40 (dd, J = 16.8. 3.1 Hz, 1H), 3.17 (dd, J = 16.8, 7.1 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.7,
165.9, 149.9, 142.5, 139.1, 135.4, 131.4, 130.4, 129.5, 128.6, 128.4, 128.3, 126.3, 126.0, 124.2, 122.9,
121.4, 119.5, 67.2, 66.8, 62.9, 52.4, 40.6.; HRMS (EI, double focusing) m/z: [M]+ Calcd for
C25H21NO7S 479.1039; found 479.1039.
7j: Yield 71% (150 mg as a white solid, trans:cis=3.9:1).
trans-(S,R)-7j:
dihydrobenzo[f][benzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
white solid, mp: 148.3-150.2oC; 98% ee (chiralpak AD-H, 20% IPA/n-hexanes,
Benzyl-2-((8S,14bR)-6,6-dioxido-8,14b-
1.0ml/min, 215nm, tR(major) = 25.4 min, tR(minor) = 19.6 min); []D 20 = -30.7
(c 0.3, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 8.01(s, 1H) 7.92 (d, J =8.0, 1H),
7.70(d, J = 7.8, 1H), 7.61-7.58 (m, 2H), 7.56-7.49 (m, 2H), 7.37-7.28 (m, 7H),
7.05 (d, J = 8.1, 1H), 6.42 (s, 1H), 5.64 (d, J = 5.5 Hz, 1H), 5.22 (d, J = 4.9, 2H), 3.57 (dd, J = 16.9,
3.1, 1H), 3.15 (dd, J = 16.9, 7.9 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.2, 149.9, 137.1, 136.2,
135.5, 133.6, 133.3, 129.3, 128.6, 128.5, 128.4, 128.2, 128.1, 126.8, 126.73, 126.71, 125.9, 122.0, 121.9,
119.2, 66.9, 66.7, 62.4, 41.3.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C27H21NO5S 471.1140;
found 471.1142.
7k: Yield 86% (134 mg as a colorless oil, trans:cis=6:1).
trans-(S,R)-7k:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 98% ee (Chiralcel OD-H, 20% IPA/n-hexanes, 1.0 ml/min,
Benzyl-2-((8S,12bR)-4-methoxy-6,6-dioxido-8,12b-
215nm, tR(major) = 15.7 min, tR(minor) = 21.4 min); []D 21 = +49.3 (c 0.3,
CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.53 (d, J = 7.7 Hz, 1H), 7.39-7.30
(m, 7H), 7.16-7.14 (m, 2H), 7.05 (d, J = 7.9 Hz, 1H), 6.87 (d, J = 7.9 Hz,
1H), 6.25 (s, 1H), 5.55 (d, J = 7.8 Hz, 1H), 5.18 (s, 2H), 3.88 (s, 3H), 3.43 (dd, J = 16.6, 3.2 Hz, 1H),
3.06 (dd, J = 16.6, 8.0 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.0, 149.0, 139.4, 138.6, 137.7, 135.5,
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129.2, 128.8, 128.6, 128.5, 128.3, 125.5, 123.3, 123.0, 122.9, 117.4, 111.5, 67.4, 66.7, 63.2, 56.2, 41.2.;
HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H21NO6S 451.1090; found 451.1092.
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7l: Yield 90% (140 mg as a colorless oil, trans:cis=27.9:1).
trans-(S,R)-7l:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 97% ee (Chiralpak AD-H, 30% EtOH/n-hexanes, 0.8 ml/min,
Benzyl-2-((8S,12bR)-3-methoxy-6,6-dioxido-8,12b-
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215nm, tR(major) = 26.6 min, tR(minor) = 24.3 min); []D 22 = +47.9 (c 1.0,
CHCl3).; 1H NMR (300 MHz, CDCl3) δ 7.52 (d, J = 7.6 Hz, 1H), 7.43-7.30
(m, 7H), 7.15 (d, J = 7.6 Hz, 1H), 6.78 (dd, J = 8.7, 2.5 Hz, 1H), 6.56 (d, J =
2.5 Hz, 1H), 6.20 (s, 1H), 5.53 (d, J = 7.5 Hz, 1H), 5.19 (s, 2H), 3.78 (s, 3H), 3.43 (dd, J = 16.6, 3.2 Hz,
1H), 3.05 (dd, J = 16.6, 7.9 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.1, 160.0, 150.5, 138.5, 138.1,
135.5, 129.1, 128.8, 128.6, 128.5, 128.4, 127.1, 123.0, 122.7, 113.9, 112.8, 103.9, 66.9, 66.7, 63.1, 55.6,
41.2.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H21NO6S 451.1090; found 451.1061.
cis-(R,R)-7l:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 99% ee (Chiralpak AD-H, 30% EtOH/n-hexanes, 0.8 ml/min,
Benzyl-2-((8R,12bR)-3-methoxy-6,6-dioxido-8,12b-
215nm, tR(major) = 15.5 min, tR(minor) = 17.3 min); []D 22 = -81.7 (c 0.3,
CHCl3).; 1H NMR (300 MHz, CDCl3) δ 7.64 (d, J = 7.7 Hz, 1H), 7.53-7.21
(m, 9H), 6.75 (dd, J = 8.7, 2.6 Hz, 1H), 6.55 (d, J = 2.6 Hz, 1H), 6.16 (s, 1H),
5.57 (dd, J = 10.9, 3.5 Hz, 1H), 5.19 – 5.10 (m, 2H), 3.79 (s, 3H), 3.63 (dd, J = 15.6, 3.5 Hz, 1H), 2.36
(dd, J = 15.6, 10.9 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.8, 160.3, 151.1, 139.6, 137.5, 135.2,
128.9, 128.8, 128.6, 128.5, 126.7, 123.7, 123.6, 113.1, 112.4, 103.7, 66.8, 64.9, 62.9, 55.6, 38.1.; HRMS
(EI, double focusing) m/z: [M]+ Calcd for C24H21NO6S 451.1090; found 451.1088.
7m: Yield 87% (135 mg as a colorless oil, trans:cis=5.4:1).
trans-(S,R)-7m:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 96% ee (Chiralpak AD-H, 20% IPA/n-hexanes, 0.8 ml/min,
Benzyl-2-((8S,12bR)-2-methoxy-6,6-dioxido-8,12b-
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215nm, tR(major) = 28.7 min, tR(minor) = 30.4 min); []D = +161.8 (c 0.3,
CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.54 (d, J = 7.7 Hz, 1H), 7.41-7.30 (m,
7H), 7.16 (d, J = 7.7 Hz, 1H), 6.99-6.97 (m, 2H), 6.82 (dd, J = 9.0, 3.0 Hz, 1H),
6.20 (s, 1H), 5.52 (d, J = 7.7 Hz, 1H), 5.19 (s, 2H), 3.81 (s, 3H), 3.42 (dd, J =
16.6, 3.3 Hz, 1H), 3.05 (dd, J = 16.6, 7.9 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.1, 157.0, 143.5,
138.7, 137.6, 135.5, 129.2, 128.9, 128.6, 128.5, 128.3, 123.1, 123.0, 122.9, 120.1, 114.0, 111.9, 67.3,
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66.7, 63.1, 55.7, 41.2.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H21NO6S 451.1090; found
451.1089.
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cis-(R,R)-7m:
dihydrobenz0[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 95% ee (Chiralpak AD-H, 20% IPA/n-hexanes, 0.8 ml/min, 215nm,
Benzyl-2-((8R,12bR)-2-methoxy-6,6-dioxido-8,12b-
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tR(major) = 18.6 min, tR(minor) = 25.1 min); []D = -20.1 (c 0.3, CHCl3).; H
NMR (500 MHz, CDCl3) δ 7.66 (d, J = 7.7 Hz, 1H), 7.45 (t, J = 7.5 Hz, 1H), 7.39-
7.30 (m, 9H), 7.23 (d, J = 7.7 Hz, 1H), 7.01-6.97 (m, 2H), 6.84 (dd, J = 9.1, 2.8
Hz, 1H), 6.18 (s, 1H), 5.56 (dd, J = 10.9, 3.4 Hz, 1H), 5.15 (s, 2H), 3.80 (s, 3H),
3.64 (dd, J = 15.5, 3.5 Hz, 1H), 2.36 (dd, J = 15.6, 10.9 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.8,
156.7, 144.1, 139.8, 137.1, 135.2, 129.1, 128.9, 128.6, 128.5, 123.8, 123.7, 122.2, 119.9, 114.4, 111.4,
66.8, 65.4, 62.8, 55.7, 38.1.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H21NO6S 451.1090;
found 451.1089.
7n: Yield 82% (63 mg as a colorless oil, trans:cis=14.4:1).
trans-(S,R)-7n:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 96% ee (Chiralpak IC, 20% EtOH/n-hexanes, 0.8 ml/min, 215nm,
Benzyl-2-((8S,12bR)-4-chloro-6,6-dioxido-8,12b-
tR(major) = 16.1 min, tR(minor) = 8.5 min); []D 22 = +22.1 (c 0.7, CHCl3).; 1H
NMR (500 MHz, CDCl3) δ 7.52 (d, J = 7.7 Hz, 1H), 7.41-7.31 (m, 8H), 7.16
(t, J = 8.0 Hz, 2H), 6.25 (s, 1H), 5.57 (d, J = 7.6 Hz, 1H), 5.19 (s, 2H), 3.41
(dd, J = 16.6, 3.2 Hz, 1H), 3.08 (dd, J = 16.6, 7.8 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.9, 145.8,
138.4, 137.2, 135.4, 129.9, 129.4, 128.9, 128.6, 128.5, 128.4, 125.8, 124.7, 124.2, 123.0, 122.9, 67.4,
66.7, 63.4, 41.1.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C23H18 ClNO5S 455.0594; found
455.0573.
7o: Yield 84% (130 mg as a colorless oil, trans:cis=3.9:1).
trans-(S,R)-7o:
Benzyl-2-((8S,12bR)-2-chloro-6,6-dioxido-8,12b-
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Colorless oil, 97% ee (Chiralpak AD-H, 30% EtOH/n-hexanes, 1.0 ml/min,
BnO2C
O O
S
19
N
O
215nm, tR(major) = 15.7 min, tR(minor) = 18.6 min); []D = +94.4 (c 0.3,
CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.54 (d, J = 7.7 Hz, 1H), 7.45-7.33 (m,
8H), 7.26 (dd, J = 8.8, 2.5 Hz, 1H), 7.17 (d, J = 7.7 Hz, 1H), 7.00 (d, J = 8.8 Hz,
1H), 6.20 (s, 1H), 5.52 (d, J = 7.7, 1H), 5.19 (s, 2H), 3.42 (dd, J = 16.6, 3.2 Hz,
Cl
1H), 3.05 (dd, J = 16.7, 7.8 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.9, 148.4, 138.6, 137.0, 135.4,
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131.0, 129.5, 129.3, 129.1, 128.6, 128.5, 128.4, 126.4, 123.8, 123.1, 122.8, 120.7, 67.0, 66.8, 63.2, 41.0.;
HRMS (EI, double focusing) m/z: [M]+ Calcd for C23H18 ClNO5S 455.0594; found 455.0592.
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7p: Yield 80% (96 mg as a colorless oil, trans:cis=12.2:1).
trans-(S,R)-7p:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindole-2-carboxylate 6,6-dioxide
Colorless oil, 99% ee (Chiralpak AD-H, 10% IPA/n-hexanes, 1.0 ml/min,
Methyl-(8S,12bR)-8-(2-(benzyloxy)-2-oxoethyl)-8,12b-
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215nm, tR(major) = 64.3 min, tR(minor) = 57.4 min); []D = +83.5 (c 0.2,
CHCl3).; 1H NMR (500 MHz, CDCl3) δ 8.20 (s, 1H), 7.96 (dd, J = 8.6, 1.7 Hz,
1H), 7.63 (d, J = 7.7 Hz, 1H), 7.44-7.32 (m, 7H), 7.16 (d, J = 7.7 Hz, 1H), 7.10
(d, J = 8.6 Hz, 1H), 6.29 (s, 1H), 5.55 (d, J = 7.7, 1H), 5.19 (s, 2H), 3.95 (s,
3H), 3.42 (dd, J = 16.6, 3.3 Hz, 1H), 3.07 (dd, J = 16.6, 3.32 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ
169.9, 165.5, 153.1, 138.4, 137.2, 135.4, 130.5, 129.5, 129.2, 128.6, 128.5, 128.44, 128.41, 127.8, 123.0,
122.9, 122.4, 119.5, 67.1, 66.8, 63.3, 52.5, 41.1, 25.4.; HRMS (EI, double focusing) m/z: [M]+ calcd
for C25H21NO7S 479.1039; found 479.1039.
7q: Yield 81% (60 mg as a colorless oil, trans:cis=7.9:1).
trans-(S,R)-7q:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Brown oil, 79% ee (Chiralpak IA, 10%EtOH/n-hexanes, 0.7 ml/min, 215nm,
Benzyl-2-((8S,12bR)-6,6-dioxido-3-(trifluoromethyl)-8,12b-
tR(major) = 18.6 min, tR(minor) = 16.7 min); []D 28 = -1.998 (c 0.3, CHCl3).;
1H NMR (500 MHz, CDCl3) δ 7.63 (d, J = 8.2 Hz, 1H), 7.55 (d, J = 7.7 Hz,
1H), 7.52 – 7.46 (m, 2H), 7.44 – 7.31 (m, 11H), 7.18 (d, J = 7.7 Hz, 1H),
6.29 (s, 1H), 5.55 (d, J = 7.5 Hz, 1H), 5.19 (s, 2H), 3.41 (dd, J = 16.6, 3.2 Hz, 1H), 3.08 (dd, J = 16.7,
7.7 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.8, 150.0, 138.5, 136.7, 135.4, 131.8, 131.6, 129.6,
129.1, 128.6, 128.5, 128.4, 127.3, 126.2, 123.1, 122.8, 122.4 (t, JCF = 3.7 Hz), 116.8 (q, JCF = 3.7 Hz),
67.2, 66.8, 63.3, 41.0.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H18 F3NO5S 489.0858;
found 489.0855.
7r: Yield 90% (150 mg as a colorless oil, trans:cis=6.5:1).
trans-(S,R)-7r:
Benzyl-2-((8S,12bR)-2-chloro-10-methyl-6,6-dioxido-8,12b-
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
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Colorless oil, 97% ee (Chiralcel OD-H, 5% IPA/n-hexanes, 1.0 ml/min, 215nm,
tR(major) = 18.5 min, tR(minor) = 16.3 min); []D 20 = +113.7 (c 0.3, CHCl3).; 1H
NMR (500 MHz, CDCl3) δ 7.43-7.35 (m, 7H), 7.26-7.21 (m, 2H), 6.99 (d, J =
8.7 Hz, 1H), 6.94 (s, 1H), 6.16 (s, 1H), 5.48 (d, J = 7.7 Hz, 1H), 5.21 (d, J = 2.2
Hz , 2H), 3.41 (dd, J = 16.6, 3.2 Hz, 1H), 3.03 (dd, J = 16.6, 7.9 Hz, 1H), 2.30
(s, 3H).; 13C NMR (125 MHz, CDCl3) δ 170.0, 148.3, 139.7, 138.7, 135.5, 134.1, 130.1, 130.0, 129.2,
128.6, 128.5, 128.4, 126.4, 124.1, 123.5, 122.5, 120.6, 66.8, 66.7, 63.1, 41.1, 21.4.; HRMS (EI, double
focusing) m/z: [M]+ Calcd for C24H20ClNO5S 469.0751; found 469.0743.
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7s: Yield 70% (145 mg as a colorless oil, trans:cis=3.8:1).
trans-(S,R)-7s:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)acetate
Brown oil, 97% ee (Chiralpak IC, 50% IPA/n-hexanes, 0.6 ml/min, 215nm,
Benzyl2-((8S,12bR)-10-chloro-2-methoxy-6,6-dioxido-8,12b-
tR(major) = 28.1 min, tR(minor) = 16.2 min); []D 20 = +124.6 (c 0.4, CHCl3).; 1H
NMR (500 MHz, CDCl3) δ 7.46-7.34 (m, 7H), 7.42-7.35 (m, 6H), 7.20 (s, 1H),
6.99 (d, J = 9.0 Hz, 1H), 6.90 (d, J = 2.7 Hz, 1H), 6.83 (dd, J = 9.0. 2.8 Hz, 1H),
6.15 (s, 1H), 5.48 (d, J = 7.8 Hz, 1H), 5.20 (s, 2H), 3.81 (s, 3H), 3.41 (dd, J =
16.9. 3.0 Hz, 1H), 3.06 (dd, J = 16.9, 8.0 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 169.9, 157.1, 143.4,
140.7, 136.2, 135.4, 129.3, 128.7, 128.5, 123.9, 123.4, 122.7, 120.2, 114.1, 111.8, 66.9, 66.8, 62.8, 55.8,
40.9.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C24H20ClNO6S 485.0700; found 485.0699.
7t: Benzyl (S,E)-3-(2-(2,2-dioxido-3,4-dihydrobenzo[e][1,2,3]oxathiazin-4-yl)thiophen-3-yl)acrylate
Yield: 56% (45 mg as a colorless oil); 97% ee (chiralpak ID, 30% EtOH/n-
hexane, 1.0ml/min, 215nm, tR(major) = 6.88 min, tR(minor) = 9.48 min); []D
20 = +24.3 (c 0.5, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.78 (d, J = 15.7 Hz,
O O
S
BnO2C
HN
O
S
1H), 7.41-7.35 (m, 7H), 7.31 (d, J = 5.4 Hz, 1H), 7.16 (t, J = 7.6 Hz, 1H), 7.08
13
(d, J = 8.3 Hz, 1H), 7.00 (d, J = 7.8 Hz, 1H), 6.46-6.42 (m, 2H), 5.23 (s, 3H).; C NMR (125 MHz,
CDCl3) δ 166.6, 150.8, 141.1, 136.7, 135.7, 134.8, 130.4, 128.6, 128.4, 127.3, 127.0, 125.9, 125.5,
121.2, 120.5, 119.1, 66.7, 54.6.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C21H17 NO5S2
427.0548; found 427.0546.
7u: Methyl (S,E)-3-(2-(2,2-dioxido-3,4-dihydrobenzo[e][1,2,3]oxathiazin-4-yl)furan-3-yl)acetate
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Yield: 36% (24.0 mg as a yellow solid); mp: 229.0-232.2 oC; []D 20 = +5.50 (c
0.2, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 8.32 (d, 1H, J = 16.1 Hz), 8.20 (d, J
= 8.0 Hz, 1H), 7.80-7.76 (m, 2H), 7.47-7.39 (m, 2H), 6.98 (s, 1H), 6.48 (d, J =
16.1 Hz, 1H), 3.86 (s, 3H).; 13C NMR (125 MHz, CDCl3) δ 166.2, 163.1, 154.6,
147.7, 146.0, 136.9, 133.8, 132.2, 131.1, 125.8, 124.4, 119.5, 115.8, 111.8, 52.0.; HRMS (EI, double
focusing) m/z: [M]+ Calcd for C15H13 NO6S 335.0464; found 335.0459.
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7ab: Yield 80% (53 mg as a colorless oil, trans:cis=4.6:1).
trans-(S,R)-7ab: Methyl-2-((8S,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
a]isoindol-8-yl)acetate
Colorless oil, 99% ee (Chiralpak AD-H, 20% EtOH/n-hexanes, 1.0 ml/min, 215nm,
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tR(major) = 21.4 min, tR(minor) = 16.1 min); []D = +128.9 (c 0.2, CHCl3).; H
NMR (500 MHz, CDCl3) δ 7.61 (d, J = 7.5 Hz, 1H), 7.52 (d, J = 7.7 Hz, 1H), 7.43-
7.37 (m, 2H), 7.32-7.17 (m, 3H), 7.05 (d, J = 8.1 Hz, 1H), 6.34 (s, 1H), 5.54 (d, J =
7.9 Hz, 1H), 3.77 (s, 3H), 3.41 (dd, J = 16.8, 3.2 Hz, 1H), 2.99 (dd, J = 16.8, 8.1
Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.8, 149.8, 138.8, 137.7, 129.3, 129.2, 128.9, 126.5, 125.8,
123.0, 122.9, 122.2, 119.3, 67.3, 63.0, 51.9, 41.0.; HRMS (EI, double focusing) m/z: [M]+ Calcd for
C17H15NO5S 345.0671; found 345.0677.
7ac: Yield 70% (52 mg as a colorless oil, trans:cis=9.9:1).
trans-(S,R)-7ac: tert-Butyl-2-((8S,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
a]isoindol-8-yl)acetate
Colorless oil, 98% ee (Chiralpak IA, 5% EtOH/n-hexanes, 0.7 ml/min, 215nm,
tBuO2C
O O
tR(major) = 21.2 min, tR(minor) = 18.0 min); []D 27 = +22.2 (c 0.5, CHCl3).; 1H
S
N
O
NMR (500 MHz, CDCl3) δ 7.60 (d, J = 7.3 Hz, 1H), 7.51 (d, J = 7.7 Hz, 1H),
7.42–7.36 (m, 2H), 7.31–7.28 (m, 2H), 7.22 (t, J = 7.5 Hz, 1H), 7.05 (d, J = 8.2
Hz, 1H), 6.31 (s, 1H), 5.48 (d, J = 8.0 Hz, 1H), 3.32 (dd, J = 16.4, 3.0 Hz, 1H), 2.92 (dd, J = 16.4, 8.0
Hz, 1H), 1.46 (s, 9H).; 13C NMR (125 MHz, CDCl3) δ 169.5, 149.9, 139.1, 137.7, 129.2, 129.1, 128.7,
126.5, 125.8, 123.1, 122.8, 122.2, 119.2, 81.3, 67.2, 63.3, 42.2, 28.0.; HRMS (EI, double focusing) m/z:
[M]+ calcd for C20H21NO5S 387.1140; found 387.1138.
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cis-(R,R)-7ac: tert-Butyl-2-((8R,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
a]isoindol-8-yl)acetate Colorless oil, >99% ee (Chiralpak IA, 5% EtOH/n-
tBuO2C
O O
hexanes, 0.7 ml/min, 215nm, tR(major) = 13.2 min, tR(minor) = 14.2 min);
S
N
O
[]D 27 = -28.4 (c 0.4, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.71 (d, J = 7.7
Hz, 1H), 7.55 (d, J = 7.8 Hz, 1H), 7.49–7.32 (m, 3H), 7.33 (t, J = 7.7 Hz, 1H),
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7.22 (t, J = 7.6 Hz, 1H), 7.06 (d, J = 8.2 Hz, 1H), 6.24 (s, 1H), 5.55 (dd, J = 11.2, 3.2 Hz, 1H), 3.56 (dd,
J = 15.6, 3.3 Hz, 1H), 2.19 (dd, J = 15.6, 11.2 Hz, 1H), 1.46 (s, 9H).; 13C NMR (125 MHz, CDCl3) δ
169.2, 150.5, 140.2, 137.2, 129.5, 129.0, 128.7, 126.0, 125.4, 123.9, 123.8, 121.5, 119.1, 81.7, 65.3,
63.1, 39.0, 28.1.; HRMS (EI, double focusing) m/z: [M]+ calcd for C20H21NO5S 387.1140; found
387.1137.
7ad: Yield 73% (60 mg as a colorless oil, trans:cis=10.5:1).
trans-(R,R)-7ad:
dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindole 6,6-dioxide
Colorless oil, 97% ee (Chiralpak IA, 30% EtOH/n-hexanes, 1.0 ml/min, 215nm,
(8R,12bR)-8-((phenylsulfonyl)methyl)-8,12b-
tR(major) = 26.9 min, tR(minor) = 24.4 min); []D 22 = +171.6 (c 0.3, CHCl3).; 1H
NMR (500 MHz, CDCl3) δ 7.96 (dd, J = 8.3, 1.1 Hz, 2H), 7.84-7.80 (m, 1H),
7.73-7.70 (m, 1H), 7.63-7.60 (m, 3H), 7.50-7.43 (m, 3H), 7.30-7.21 (m, 2H), 6.99
(dd, J = 8.1, 1.1 Hz, 1H), 6.21 (s, 1H), 5.53 (d, J = 7.7 Hz, 1H), 4.16 (dd, J = 15.0, 1.5 Hz, 1H), 3.89
13
(dd, J = 15.0, 7.7 Hz, 1H).; C NMR (125 MHz, CDCl3) δ 149.5, 139.7, 137.5, 136.9, 134.1, 129.6,
129.4, 129.3, 128.2, 126.6, 126.1, 124.4, 122.7, 121.9, 119.2, 67.2, 61.5, 61.2.; HRMS (EI, double
focusing) m/z: [M]+ Calcd for C21H17NO5S2 427.0548; found 427.0533.
7ae: Yield 64% (40 mg as a colorless oil, trans:cis=16.5:1).
trans-(S,R)-7ae:
a]isoindol-8-yl)propan-2-one
Colorless oil, 98% ee (Chiralpak AD-H, 5% EtOH/n-hexanes, 1.0 ml/min, 215nm,
1-((8S,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
tR(major) = 34.0 min, tR(minor) = 26.7 min); []D 22 = +40.1 (c 0.2, CHCl3).; 1H NMR
(500 MHz, CDCl3) δ 7.60 (d, J = 7.6 Hz, 1H), 7.49 (d, J = 7.8 Hz, 1H), 7.42-7.29 (m,
4H), 7.23-7.19 (m, 2H), 7.05 (d, J = 8.0 Hz, 1H), 6.31 (s, 1H), 5.57 (d, J = 8.1 Hz,
1H), 3.62-3.58 (m, 1H), 3.10 (dd, J = 18.2, 8.4 Hz, 1H), 2.28 (s, 3H).; 13C NMR (125 MHz, CDCl3) δ
205.8, 149.8, 139.6, 137.5, 129.3, 128.7, 126.5, 125.8, 123.3, 122.8, 121.9, 119.2, 67.2, 62.2, 50.4, 30.7.;
HRMS (EI, double focusing) m/z: [M]+ Calcd for C17H15NO4S 329.0722; found 329.0719.
7af: Yield 82% (51 mg as a coloress oil, trans:cis=8.8:1).
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trans-(S,R)-7af:
2-((8S,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
a]isoindol-8-yl)acetonitrile
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Colorless oil, 98% ee (Chiralpak AD-H, 30% EtOH/n-hexanes, 1.0 ml/min, 215nm,
tR(major) = 14.0 min, tR(minor) = 18.1 min); []D 25 = +16.5 (c 0.4, CHCl3).; 1H NMR
(500 MHz, CDCl3) δ 7.68-7.66 (m, 1H), 7.55-7.46 (m, 3H), 7.44-7.42 (m, 1H), 7.34-7.25
(m, 1H), 7.06 (dd, J = 8.1, 1.2 Hz, 1H), 6.43 (s, 1H), 5.34-5.33 (m, 1H), 3.35-3.23 (m, 2H).;
13C NMR (125 MHz, CDCl3) δ 149.6, 138.1, 135.8, 130.0, 129.8, 129.4, 126.4, 126.2, 123.4, 122.8,
122.0, 119.4, 115.9, 67.5, 62.4, 25.4.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C16H12N2O3S
312.0569; found 312.0550.
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8a: Benzyl (E)-3-((8S,12bR)-8-(2-(benzyloxy)-2-oxoethyl)-6,6-dioxido-8,12-bdihydrobenzo[5,6][1,2,3]
oxathiazino [4,3-a]isoindol-12-yl)acrylate
A 20 mL sealed tube equipped with a magnetic stirring bar was charged with benzo-1,3-sulfamidate 6a
(30 mg, 0.16 mmol), [RhCp*Cl2]2 (1.4 mg, 2.0 mol%), AgOAc (38 mg, 0.23 mmol), benzyl acrylate
(56 mg, 0.35 mmol), K3PO4 (12 mg, 0.06 mmol) and 2 mL of anhydrous MeCN. The reaction tube was
capped and stirred at 100 oC for 12 h. When the starting material was consumed completely (monitored
by TLC), the tube was cooled to room temperature. The mixture was diluted with EtOAc and filtered
through a celite pad. The solvents and the volatiles were evaporated under reduced pressure followed
by the purification through flash column chromatography using EtOAc /hexanes as an eluent to afford
title compounds as diastereomeric mixture. Yield 31% (21 mg as a colorless oil). trans:cis=5.7:1
(determined by chiral HPLC chromatography).
trans-(S,R)-8a:
Colorless viscous oil, 98% ee (Chiralpak ID, 50% IPA/n-hexanes, 1.0 ml/min, 215
nm, tR(major) = 58.5 min, tR(minor) = 35.3 min); []D 17 = -118.5 (c 0.3, CHCl3).;
1H NMR (500 MHz, CDCl3) δ 8.01 (d, J = 15.9 Hz, 1H), 7.66 (d, J = 8.0 Hz, 1H),
7.49 – 7.30 (m, 8H), 7.15 (d, J = 6.9 Hz, 3H), 7.12 – 7.05 (m, 2H), 6.69 (d, J =
15.9 Hz, 1H), 6.54 (s, 1H), 5.33 (d, J = 3.2 Hz, 2H), 5.20 (d, J = 2.2 Hz, 2H), 3.54
(dd, J = 17.0, 3.1 Hz, 1H), 3.00 (dd, J = 17.0, 8.0 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 170.2, 165.9,
149.8, 141.1, 140.9, 137.6, 135.7, 135.4, 129.8, 129.6, 128.7, 128.6, 128.5, 128.5, 128.4, 127.5, 126.5,
125.9, 124.7, 120.9, 120.4, 119.0, 77.3, 66.8, 66.8, 65.9, 61.8, 39.9.; HRMS (FAB, double focusing)
m/z: [M+H+] Calcd for C33H27NO7S 582.1586; found 582.1592 (M+H+).
9a: Benzyl (R,E)-3-(2-(2,2-dioxido-3,4-dihydrobenzo[e][1,2,3]oxathiazin-4-yl)phenyl)acrylate
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A 20 mL sealed tube equipped with a magnetic stirring bar was charged with benzo-1,3-sulfamidate 6a
(30 mg, 0.12 mmol), [RhCp*Cl2]2 (1.4 mg, 2.0 mol%), AgOAc (38 mg, 0.23 mmol), benzyl acrylate
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(20 mg, 0.13 mmol), and 2 mL of anhydrous acetone. The reaction tube was capped and stirred at 100 ℃
(bath temperature). When the starting material was consumed completely (monitored by TLC), the tube
was cooled to room temperature. The mixture was diluted with EtOAc and filtered through a celite pad.
The solvents and the volatiles were evaporated under reduced pressure followed by the purification
through flash column chromatography using EtOAc /hexanes as an eluent to afford title compounds as
colorless liquid.
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Yield: 39% (19 mg as a colorless viscous oil); 98% ee (Chiralpak AD-H, 30%
EtOH/n-hexanes, 1.0 ml/min, 215 nm, tR(major) = 12.1 min, tR(minor) = 20.0 min);
[]D 17 = 27.9 (c 0.15, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 8.03 (d, J = 15.7 Hz,
1H), 7.66 (d, J = 8.9 Hz, 1H), 7.56 – 7.31 (m, 7H), 7.26 (d, J = 8.8 Hz, 1H), 7.12 (t,
J = 7.0 Hz, 1H), 7.08 (d, J = 7.4 Hz, 1H), 6.82 (d, J = 7.8 Hz, 1H), 6.47 (d, J = 15.7 Hz, 1H), 6.29 (d, J
= 8.5 Hz, 1H), 5.27 (s, 2H), 4.73 (d, J = 8.5 Hz, 1H).; 13C NMR (125 MHz, CDCl3) δ 165.8, 151.6,
140.5, 136.4, 135.7, 134.6, 130.6, 129.9, 129.9, 129.7, 128.6, 128.4, 128.2, 128.1, 125.5, 122.7, 121.5,
119.2, 66.7, 58.6.; HRMS (FAB, double focusing) m/z: [M+H+] Calcd for C23H19NO5S 422.1062; found
422.1048 (M+H+).
trans-(S,R)-10a:
2-((8S,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-
a]isoindol-8-yl)acetic acid
To a solution of (S,R)-7a (50 mg, 0.24 mmol) in MeOH (5.0 mL) was added 10% Pd/C (5 mg, 10%
wt/wt) and the reaction mixture was stirred under H2 (g) for 12 h. The mixture was filtered through a
celite pad and the filtrate was evaporated under vacuum to get (S,R)-10a as a white solid.
Yield: 98% (38.5 mg as a white solid); mp: 212.5-215.1 oC; 99% ee (Chiralpak IA,
10% IPA/n-hexanes/TFA, 1.1 ml/min, 215 nm, tR(major) = 16.2 min, tR(minor) =
18.8 min); []D 12 = +92.4 (c 0.1, acetone).; 1H NMR (500 MHz, CDCl3) 1H NMR
(500 MHz, Acetone-d6) δ 7.87 (d, J = 7.5 Hz, 1H), 7.82 (d, J = 7.6 Hz, 1H), 7.47 –
7.35 (m, 3H), 7.31 (t, J = 7.0 Hz, 1H), 7.11 (d, J = 8.2 Hz, 1H), 6.46 (s, 1H), 5.51 (d, J = 8.0 Hz, 1H),
3.41 (dd, J = 17.0, 2.8 Hz, 1H), 3.00 (dd, J = 17.0, 8.1 Hz, 1H).; 13C NMR (125 MHz, Acetone-d6) δ
170.8, 149.7, 138.9, 138.0, 129.2, 129.1, 128.8, 127.2, 125.9, 123.4, 122.8, 122.6, 118.7, 67.2, 63.1,
40.3.; HRMS (EI, double focusing) m/z: [M]+ Calcd for C16H13NO5S 331.0514; found 331.0510.
(S,R)-11: 2-((8S,12bR)-6,6-dioxido-8,12b-dihydrobenzo[5,6][1,2,3]oxathiazino[4,3-a]isoindol-8-yl)-
N,N-diethylacetamide
To a solution of (S,R)-10a (35 mg, 0.11 mmol) in DCM (2.0 mL) was added EDCI.HCl (30 mg, 0.16
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mmol) and HOBt (24 mg, 0.16 mmol) followed by diethylamine (9.3 mg, 0.13 mmol). The reaction
mixture was stirred at rt for 12 h. The mixture was diluted with water and extracted with DCM (2 x 25
mL). The combined organic layer was dried over Na2SO4 and evaporated under reduced pressure. The
crude mixture was purified on silica gel column chromatography using EtOAc/hexanes as an eluent to
give (S,R)-11 as a white solid.
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Yield: 95% (39 mg as a white solid); mp: 158.2-161.3 oC; >99% ee (Chiralpak IC,
15% EtOH/n-hexanes, 1.0 ml/min, 215 nm, tR(major) = 16.0 min, tR(minor) = 18.1
min); []D 28 = +83.2 (c 0.35, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.59 (d, J =
7.5 Hz, 1H), 7.50 (d, J = 7.7 Hz, 1H), 7.44 (d, J = 7.5 Hz, 1H), 7.40-7.33 (m, 2H),
7.28 (d, J = 8.3 Hz, 1H), 7.21 (t, J = 7.4 Hz, 1H), 7.04 (d, J = 8.1 Hz, 1H), 6.32 (s, 1H), 5.70 (d, J = 9.2
Hz, 1H), 3.53-3.45 (m, 3H), 3.35 (sept, J = 7.6 Hz, 2H), 2.85 (dd, J = 16.3, 9.3 Hz, 1H), 1.21-1.18 (m,
6H).; 13C NMR (125 MHz, CDCl3) δ 168.8, 149.8, 140.2, 137.4, 129.2, 129.1, 128.5, 126.5, 125.7,
124.1, 122.5, 122.1, 119.2, 67.2, 63.8, 42.1, 40.8, 40.3, 14.2, 13.1.; HRMS (EI, double focusing) m/z:
[M]+ Calcd for C20H22N2O4S 386.1300; found 386.1297.
(S,S)-12: N,N-diethyl-2-((1S,3S)-3-(o-tolyl)isoindolin-1-yl)acetamide
A solution of (S,R)-11 (30 mg, 0.07 mmol) in THF/Et2O (0.2/2.0 mL) was degassed for 5 min and added
Ni(dppf)Cl2 (5 mol%) followed by the addition of 3 M MeMgBr (0.078 mL, 0.23 mmol). The mixture
was heated to 55 oC for 12 h. The reaction mixture was allowed to cool to rt and quenched with MeOH.
The solvents were evaporated under vacuum, treated with 2 M HCl in methanol, and heated to 55 oC
for 6 h. The reaction mixture was evaporated again and washed with EtOAc. The resulting aqueous
layer was basified with NaHCO3 and extracted with DCM. The organic layer was evaporated under
vacuum and the crude mixture was purified on silica gel column chromatography using DCM/MeOH
as an eluent to afford (S,S)-12 as a white solid.
Yield: 74% (18.5 mg as a white solid); mp: 246.4-248.0 oC; >99% ee (Chiralpak
OD-H, 5% IPA/n-hexanes, 0.8 ml/min, 215nm, tR(major) = 15.3 min, tR(minor) =
25.4 min); []D 20 = -8.9 (c 0.1, CHCl3).; 1H NMR (500 MHz, CDCl3) δ 7.48-7.41
(m, 2H), 7.33-7.32 (m, 3H), 7.20 (d, J = 7.5 Hz, 1H), 7.13-7.10 (m, 1H), 6.72 (d, J
= 7.8 Hz, 1H), 6.43 (s, 1H), 5.39 (dd, J = 9.3, 3.7 Hz, 1H), 3.72 (dd, J = 16.8, 9.2 Hz, 1H), 3.49-3.31
(m, 4H), 3.17 (dd, J = 17.0, 3.7 Hz, 1H), 2.63 (s, 3H), 1.29 (t, J = 7.2 Hz, 3H), 1.15 (t, J = 7.1 Hz, 3H).;
13C NMR (125 MHz, CDCl3) δ 168.4, 137.9, 137.6, 137.3, 133.4, 131.4, 130.0, 129.7, 129.4, 128.1,
126.7, 124.5, 122.1, 62.7, 60.5, 42.3, 40.6, 34.9, 19.9, 14.1, 12.9.; HRMS (EI, double focusing) m/z:
[M]+ Calcd for C21H26N2O 322.2045; found 322.2032.
(S,R)-13:
Benzyl-2-((8S,12bR)-6,6-dioxido-11-phenyl-8,12b-
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