Palladium-catalyzed desulfinylative C-C allylation of Grignard reagents and enolates using allylsulfonyl chlorides and esters

Article abstract of DOI:10.1016/j.tet.2008.11.007

2-Methylprop-2-ene-, prop-2-ene-, 1-methylprop-2-ene-, and (E)-but-2-enesulfonyl chlorides have been used as electrophilic partners in desulfinylative palladium-catalyzed C-C coupling with Grignard reagents and sodium salts of dimethyl malonate and methyl

Full text of DOI:10.1016/j.tet.2008.11.007

Tetrahedron 65 (2009) 504–511
Contents lists available at ScienceDirect
Tetrahedron
journal homepage: www.elsevier.com/locate/tet
Palladium-catalyzed desulfinylative C–C allylation of Grignard reagents and
enolates using allylsulfonyl chlorides and esters
,
Chandra M. Rao Volla a, Srinivas Reddy Dubbaka b, Pierre Vogel a
*
a Laboratory of Glycochemistry and Asymmetric Synthesis (LGSA), Swiss Institute of Technology in Lausanne (EPFL), Batochime, CH 1015 Lausanne, Switzerland
b Laboratory of Organic Chemistry, ETH Zu¨rich, CH-8093 Zu¨rich, Switzerland
a r t i c l e i n f o
a b s t r a c t
Article history:
2-Methylprop-2-ene-, prop-2-ene-, 1-methylprop-2-ene-, and (E)-but-2-enesulfonyl chlorides have been
used as electrophilic partners in desulfinylative palladium-catalyzed C–C coupling with Grignard re-
agents and sodium salts of dimethyl malonate and methyl acetoacetate. Neopentyl alk-2-ene sulfonates
can also be used as electrophilic partners in desulfinylative allylic arylations and allylic alkylations. The
regioselectivity of the allylic arylation and alkylation depends on the nature of the catalyst. With
PdCl2(PhCN)2, (E)-crotyl derivatives are formed in high regioselectivity using either 1-methylprop-2-ene-
or (E)-but-2-enesulfonyl chloride.
Received 28 September 2008
Received in revised form 29 October 2008
Accepted 4 November 2008
Available online 8 November 2008
Keywords:
Allylic alkylation
Allylic arylation
Ó 2008 Elsevier Ltd. All rights reserved.
Homogenous catalysis
Regioselective allylation
Palladium complexes
Sulfonate esters
Sulfonyl chlorides
Grignard reagents
1. Introduction
esters,53–55 and sulfonamides56 in the presence of nickel catalysts.
Since 1929 it is known that Grignard reagents displace sulfonyl
The search of efficient methods for the construction of carbon–
carbon bonds represents an ongoing, central theme of research of
organic synthesis.1–11 Transition metal catalyzed cross-coupling of
organometallic reagents with halides or triflates constitutes today
one of the most powerful methods to generate carbon–carbon
bonds.12–17 Arene- and alkanesulfonyl chlorides are inexpensive
and readily available compounds. They have been used for more
than a century in material sciences and medicinal chemistry.18–23
Recently, we have shown that Stille, carbonylative Stille,24,25
Suzuki–Miyaura,26 Sonogashira–Hagihara27 type cross-couplings
and Mizoroki–Heck28,29 type arylations can be carried out using
sulfonyl chlorides as electrophilic partners under desulfinylation
conditions.30 In the case of Mizoroki–Heck coupling reaction, Pd
nanoparticles in nitrile-functionalized ionic liquid, without ex-
pensive or toxic ligands can be used as recoverable catalyst.29 We
have also shown that aliphatic sulfonyl chlorides are also excellent
electrophiles.31 Among the earliest, most economical and useful
nucleophilic partners are the Grignard reagents, which can be
coupled with all kinds of electrophilic partners such as sulfides,
chlorides to generate the corresponding sulfones (Scheme 1A).57
Early experiments with sulfonyl chlorides and aryl Grignard re-
agents in the presence of Pd[P(t-Bu)3]2 catalyst led to products of
aryl–aryl homocoupling, the organomagnesium reagents had to be
converted into organozinc reagents for successful desulfinylative
C–C cross-coupling reactions (Scheme 1B).58
THF
0-20 °C
Pd[P(t-Bu)3]2
(A) RSO2Cl
(B)
+
ArMgX
RSO2Ar
Ar-Ar
+
Mg(X)Cl
70 °C, THF
Scheme 1. Sulfones synthesis and Grignard reagent C–C homocoupling.
We have now examined the palladium-catalyzed desulfinylative
C–C cross-coupling reaction using alk-2-ene-sulfonyl chlorides and
neopentyl alk-2-ene sulfonic esters with Grignard reagents (‘hard
nucleophiles’) and sodium b-oxoenolates (‘soft nucleophiles’).
32–39
sulfoxides32,40 sulfoximines,41–45 sulfones,46–52 sulfonic
2. Results and discussion
One-pot syntheses of alk-2-enesulfonyl chlorides 2a–c and alk-
2-enesulfonic esters 3a–c were realized applying the ene-reaction
of SO2
* Corresponding author. Tel.: þ41 21 693 93 71; fax: þ41 21 693 93 50.
E-mail address: pierre.vogel@epfl.ch (P. Vogel).
59
with allylsilanes 1a–c (Scheme 2A).60–64 Neopentyl
0040-4020/$ – see front matter Ó 2008 Elsevier Ltd. All rights reserved.
doi:10.1016/j.tet.2008.11.007

C.M. Rao Volla et al. / Tetrahedron 65 (2009) 504–511
505
Table 1
(E)-crotylsulfonate (3d) was prepared from (E)-crotylsulfonyl
chloride (2d) as shown in Scheme 2B.65
Our exploratory experiments engaged first sulfonyl chlorides 2a
and 2b and various Grignard reagents, PhZnCl, sodium salts of
methyl acetoacetate and dimethyl malonate as nucleophiles. Our
results are summarized in Tables 1 and 2.
Study of the effect of palladium catalysts on the reactivity of Grignard reagents with
sulfonyl chloride 2b
MgCl
conditions[a]
+
SO2Cl
THF
2a
4a
Crucial for the success was the slow addition of the nucleophilic
reagent to a premixed THF solution of the sulfonyl chloride with the
palladium catalyst. The formation of sulfones can be completely
suppressed by the dropwise addition of Grignard reagent. Temper-
ature can be varied between 20 ꢀC and 78 ꢀC without affecting yield
in products of allylation 4 significantly (Table 1, compare entries 1
and 2 and entries 7 and 8). Using 2-methylprop-2-enesulfonyl
chloride (2a), allylation of aryl and alkyl Grignard reagents have
been successful, although alkyl Grignard reagents showed slower
reactions (entries 5–7) than aryl derivatives (entries 1–4). With
PhZnCl and 2a, coupling occurs also but was significantly slower
than with PhMgCl (entry 8). With 2b, coupling with o-tolylMgCl and
p-methoxyphenylMgBr were faster and better yielded (Table 2,
entries 9–10) than the reaction with n-octylMgBr (entry 11),
which provided undec-1-ene in 66% yield. In all cases Pd[P
(t-Bu)3]2 in 5 mol % and THF led to better reaction rates and yields
than other palladium catalysts as illustrated with 2a and 2b and
Grignard reagents (Tables 1 and 2). But in the case of soft nucleo-
philes, Pd(PPh3)4 was found to be better catalyst (Table 2, entries 12
and 15) than Pd[P(t-Bu)3]2 (entry 13). The sodium salt of methyl
acetoacetate has also been allylated successfully (entries 14 and 16).
We then explored whether 2-methylprop-2-enesulfonic ester
3a would also be suitable for the desulfinylative C–C coupling with
Grignard reagents. For that neopentyl ester 3a was reacted with
o-tolylMgCl in the presence of various catalysts (5 mol %) in boiling
THF. Our results are summarized in Table 3.
The fastest and best yielded (72%) reaction used Pd(PPh3)4 as
catalyst (Table 3, entry 1). With NiCl2(dppf) the yield was slightly
lower (68%) and with [Ir(COD)Cl]2, the reaction did not occur. In-
terestingly, Fe(acac)3 is also able to catalyze the desulfinylative
coupling (Table 3, entry 3) provided that it is reacted first with
10 mol % of the Grignard reagents, followed by the addition of 3a
and slow addition of an excess (1.5–2 fold) of the Grignard reagent.
With these successes in hand we then explored whether our
conditions could be applied to the regioselective crotylation of
metallic nucleophiles. Our results are summarized in Table 4 for the
reactions of (E)-crotylsulfonyl chloride (2d) and o-tolylMgCl using
various palladium and nickel catalysts. Yields were not measured in
all our assays, but judging from the 1H NMR spectra of the crude
reaction mixtures, they were all better than 50%. In all cases the
linear product 5a was favored (product of no allylic rearrange-
ment). The regioselectivity (product ratio 5a/6a) was the best (96:4,
yield 52%) using Pd2(dba)3 and xantphos ligand66–71 (entry 6). The
best regioselectivity (95:5) and yield (75%) were realized using
PdCl2(PhCN)2 as catalyst, for a reaction in THF at room temperature
(entry 16). As for the desulfinylative methallylation (Table 1),
Entry
Conditionsa
Reaction time
Yieldb
1
2
3
4
5
6
7
8
Pd(PPh3)4, 78 ꢀ
Pd(PPh3)4, 25 ꢀ
C
C
2 h
51%
55%
39%
80%
78%
48%
87%
85%
2–3 h
2–3 h
1 h
PdCl2(dppf), 25 ꢀ
C
Pd2(dba)3, 25 ꢀ
Pd(PhCN)2Cl2, 25 ꢀ
C
C
1 h
PdCl2(PPh3)2, 25 ꢀ
Pd[P(t-Bu)3]2, 25 ꢀ
Pd[P(t-Bu)3]2, 78 ꢀ
C
2–3 h
0.5 h
0.5 h
C
C
a
The reaction of sulfonyl chloride (0.65 mmol) with Grignard reagent (1 mmol)
was made in THF (4 mL) in the presence of palladium catalyst (0.033 mmol).
b
Yield determined after flash chromatography. THF¼tetrahydrofuran, dppf¼1,10-
bis(diphenylphosphino)ferrocene, dba¼dibenzylideneacetone.
Table 2
Allylic alkylation and arylation using 2-methylprop-2-ene-sulfonyl chloride (2a) and
prop-2-enesulfonyl chloride (2b) and various nucleophiles giving products of de-
sulfinylative C–C cross-coupling 4
R1
R1
cat.
Nu-M+
M+Cl-
SO2
+
+
+
SO2Cl
Nu
THF, 25 °C
4
2
Entry
NuM
Cat. (5 mol %) Time Product (yield)a
1
2
3
4
5
6
7
8
2a o-tolylMgCl
2a PhMgCl
2a m-tolylMgCl
2a p-MeOC6H4MgBr
2a BnMgCl
2a PhCH2CH2MgCl
2a n-BuMgCl
2a PhZnCl
2b o-tolylMgCl
2b p-MeOC6H4MgBr
2b n-octylMgBr
2a MeOOC–CH]C(OMe)ONa Pd(PPh3)4
2a MeOOC–CH]C(OMe)ONa Pd[P(t-Bu)3]2
2a MeOOC–CH]C(Me)ONa
2b MeOOC–CH]C(OMe)ONa Pd(PPh3)4
2b MeOOC–CH]C(Me)ONa Pd(PPh3)4
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
0.5 h 4a (87%)
0.5 h 4b (82%)
0.5 h 4c (62%)
0.5 h 4d (79%)
0.5 h 4e (75%)
6 h
1 h
6 h
4f (62%)b
4g (28%)c
4b (57%)
9
0.5 h 4h (76%)
0.5 h 4i (85%)
10
11
12
13
14
15
16
3 h
4j (66%)
0.5 h 4k (76%)
0.5 h 4k (48%)
0.5 h 4l (78%)
0.5 h 4m (92%)
0.5 h 4n (89%)
Pd(PPh3)4
a
Yield determined after flash chromatography purification.
2.5 equiv. of Grignard reagent necessary.
Microwave heating for 1 h.
b
c
Pd[P(t-Bu)3]2 led to the fastest reaction and highest yield (78%), but
with a lower regioselectivity (entry 8).
Application of Hermann’s palladacycle72,73 (entry 14) did not
lead to any significant improvement of the regioselectivity. In the
1.SO2/Lewis acid
MeCN
2.NCS
R1
R1
R1
ROH
base
R2
SiMe3
H
SO2Cl
H
SO3R
(A)
(B)
H
R2
H
R2
3
a) R1 = Me, R2 = H
b) R1 = R2 = H
1
2
R= neopentyl
c) R1 = H, R2 = Me
ROH
base
SO3R
SO2Cl
R= neopentyl
3d
2d
Scheme 2. Syntheses of alk-2-enesulfonyl chlorides and neopentyl alk-2-enesulfonates.

506
C.M. Rao Volla et al. / Tetrahedron 65 (2009) 504–511
Table 3
We then applied our best conditions found for the desulfinyla-
tive crotylation reported in Table 4 to the reaction of 1-methylprop-
2-enesulfonyl chloride (2c) and various nucleophiles. Our results
are summarized in Table 5, together with those obtained for the
reactions of 2d with further nucleophiles.
Except for the Pd(PPh3)4-catalyzed reactions of m-tolylMgCl
with either the branched (2c) or linear sulfonyl chloride (2d) that
both led to a 1:1 mixture of 5bþ6b in mediocre yields (Table 5,
entries 3 and 6), the major products of desulfinylative C–C cross-
coupling are the linear (E)-crotyl derivatives 5.
As for reaction of 2d with o-tolylMgCl (Table 4, entry 16) the best
regioselectivity and yield were obtained with PdCl2(PhCN)2 as
catalyst (Table 5, entries 1, 2, 4, 5). Using Pd(PPh3)4 catalysts that
gave the best yielded reactions 2a, 2b with sodium enolates, the
regioselectivity (5 vs 6) remained bad for the desulfinylative ally-
lations of the sodium salts of dimethyl malonate (entries 7 and 9)
and of methyl acetoacetate (entries 8 and 10) with 2c and 2d. These
results suggest that the mechanism of C–C bond formation in these
Effect of the transition metal catalyst on the cross-coupling of neopentyl 2-meth-
ylprop-2-enesulfonate (3a) with o-tolylMgCl
MgCl
catalyst
THF, 78 °C
SO3R
+
3a
4a
Entry
Catalyst (equiv)
Reaction time
Yielda
1
2
3
4
Pd(PPh3)4 (5 mol %)
NiCl2(dppf) (5 mol %)
Fe(acac)3 (5 mol %)
[Ir(COD)Cl]2 (5 mol %)
2 h
3 h
21 h
2 h
72%
68%
65%
0%b
Conditions: the reaction of sulfonic ester (1 mmol) with Grignard reagent (1.5–
2.5 mmol) was made in refluxing THF (5 mL) with catalyst (0.05 mmol).
a
Yield of the coupled product was determined after flash chromatography.
No coupling product but the corresponding sulfone was formed.
b
presence of Buchwald’s ligand L2,74–76 Trost’s ligand L3,77–83 or
triarylphosphite ligand L484,85 no further improvement could be
observed.
reactions involves the formation of (p-allyl)(ligand)palladium in-
termediates that are attacked then by the nucleophiles. This
Table 4
Regioselectivity of the desulfinylative crotylation of o-tolylMgCl with (E)-crotylSO2Cl (2d) giving the linear and branched products 5a and 6a
MgCl
cat. (5 mol%)
co-ligand (10 mol%)
THF
SO2Cl
+
+
2d
5a
6a
Entry
Catalyst
Co-ligand
Temperature
Regioselectivity
5a/6aa (yieldb)
1
2
3
4
5
6
7
8
NiCl2(dppf)
Pd(PPh3)4
Pd2(dba)3
Pd2(dba)3
Pd2(dba)3
Pd2(dba)3
Pd2(dba)3
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
Pd[P(t-Bu)3]2
d
25 ꢀ
25 ꢀ
25 ꢀ
25 ꢀ
25 ꢀ
25 ꢀ
25 ꢀ
25 ꢀ
80 ꢀ
C
C
C
C
C
C
C
C
C
81/19
74/16
d
DPPF
DPPP
BINAP
L1
PCy3
d
79/21
75/25c
90/10
96/4 (52%)
dd
77/23 (78%)
93/7
78/22
72/18
89/11
88/12
90/10
89/11
95/5 (75%)
9
d
10
11
12
13
14
15
16
d
0 ꢀ
C
(p
-allylPdCl)2
d
25 ꢀ
25 ꢀ
25 ꢀ
C
C
C
Pd2(dba)3
Pd2(dba)3
Palladacycle
Pd2(dba)3
PdCl2(PhCN)2
L2
L3
d
25 ꢀC
25 ꢀ
25 ꢀ
L4
d
C
C
Conditions: 0.65 mmol of 2d and 1 mol of Grignard reagent in THF (4 mL).
a
Selectivity was determined by 1H NMR of the crude reaction.
b
Yield of 5aþ6a determined after flash chromatography.
c
Coupling product was observed only in trace amount.
d
Gave a complex mixture of products. DPPF¼1,10-bis(diphenylphosphino)ferrocene, DPPP¼1,3-bis(diphenylphosphino)propane, BINAP¼2,20-bis(diphenylphosphino)-1,10-
binaphthyl.
R
R
R
R
PCy2
i-Pr
P
P
O
O
O
O
i-Pr
Pd
Pd
O
PPh2
PPh2
R = o-tolyl (palladacycle)
L1 (xantphos)
i-Pr
L2
t-Bu
t-Bu
O
P
t-Bu
O
O
O
O
NH HN
t-Bu
R
R
t-Bu
R = PPh2
L3 (Trost's ligand)
L4
t-Bu
.

C.M. Rao Volla et al. / Tetrahedron 65 (2009) 504–511
507
Table 5
respectively. Contrary to the reactions with sulfonyl chlorides 2c
and 2d that led to the same 1:1 mixture of 5bþ6b (Table 5, entries
3, 6), we observed with the reactions of sulfonic esters 3c and 3d
different proportions of products 5b and 6b, indicating partial re-
tention of regioselectivity (Scheme 4).
Desulfinylative crotylation of metallic nucleophiles (NuM) using sulfonyl chlorides
2c and 2d
Nu
cat.
THF, 25 °C
Nu
2
+
NuM
+
6
5
It is known that iridium catalysts favor the more substituted
allylic terminus in allylic alkylations.109–117 This was also the case
for the reaction of (E)-but-2-enesulfonyl chloride (2d) with the
sodium salt of dimethyl malonate in the presence of [Ir(COD)Cl]2 in
THF at room temperature that produced a 1:4 mixture of products
of allylation 5c and 6c (Scheme 5).
Entry
NuM
Catalyst
(5 mol %)
Products
(yield)a
Regioselectivity
7/8b
1
2
3
4
5
6
7
8
9
10
2c o-tolylMgCl
2c m-tolylMgCl
2c m-tolylMgCl
2d o-tolylMgCl
2d m-tolylMgCl
2d m-tolylMgCl
2c MeOOC–CH]C(OMe)ONa Pd(PPh3)4
2c MeOOC–CH]C(Me)ONa Pd(PPh3)4
2d MeOOC–CH]C(OMe)ONa Pd(PPh3)4
2d MeOOC–CH]C(Me)ONa Pd(PPh3)4
PdCl2(PhCN)2 5aþ6a (69%) 95/5
PdCl2(PhCN)2 5bþ6b (56%) 96/4
Pd(PPh3)4
5bþ6b (42%) 50/50c
PdCl2(PhCN)2 5aþ6a (75%) 95/5
PdCl2(PhCN)2 5bþ6b (68%) 93/7
Pd(PPh3)4
5bþ6b (48%) 50/50c
5cþ6c (76%) 52/48
5dþ6d (79%) 64/36
5cþ6c (84%) 66/34
5dþ6d (82%) 66/34
3. Conclusion
Allylic arylation and alkylation of Grignard reagents and sodium
salts of dimethyl malonate and methyl acetoacetate can be carried
out under smooth conditions in the presence of a palladium cata-
lyst and using 2-alkenesulfonyl chlorides as electrophilic reagents.
The latter undergo fast desulfinylations generating (allyl)palladium
intermediates. The regioselectivity of the quenching of these in-
termediates by the nucleophilic reagents depends on the nature of
the catalyst, but not on the nature of the starting alk-2-enesulfonyl
chloride. For instance using either 1-methylprop-2-enesulfonyl
chloride or (E)-but-2-enesulfonyl chloride the linear products are
favored over the branched isomers (regioselectivity 95:5 or better)
for arylMgCl and using 5 mol % of PdCl2(PhCN)2 in THF at room
temperature. When branched isomers are targeted [Ir(COD)Cl]2-
catalyzed allylic allylation of (E)-but-2-ene-sulfonyl chlorides with
the sodium salt of dimethyl malonate can be employed.
a
Yield for the mixture of products determined after flash chromatography.
Regioselectivity determined by 1H NMR of the crude reaction mixture.
Reaction carried out under reflux of THF.
b
c
hypothesis is supported by the observation that the regioselectivity
does not depend on the nature of the starting sulfonyl chloride (2c
vs 2d). With PdCl2(PhCN)2 as catalyst, the regioselectivity in favor
of the linear products 5 ((E)-crotyl derivatives) suggests that a steric
factor is controlling the C–C bond forming process. In the case of
Pd(PPh3)4-catalyzed reactions it seems that the (crotyl)Pd(ligand)
intermediate does not make any great difference for the Nu in-
sertion into the non-substituted (less steric hindrance) and the
methyl substituted center of the (allyl)palladium moiety. For more
than 30 years it has been known that the regioselectivity of allylic
alkylation,86–95 allylic vinylation,96–98 and allylic arylation99–102
depends on the nature of the catalyst.
4. Experimental section
4.1. Methods
Although many more experiments should be carried out to
approach a mechanistic interpretation of our results, we propose at
this stage that (allyl)palladium intermediates 7 and 8 are formed by
reactions of 2c or 2d with PdCl2(PhCN)2 and Pd(PPh3)4, respectively
(Scheme 3). Intermediate 7 is expected to be more electrophilic
than 8 and favors an anti mode of addition of the nucleophiles
(Nuꢁ) onto the least sterically hindered allylic carbon center. In the
case of 8, the nucleophile undergoes first an oxidative addition or
SN2 displacement reaction at the palladium center. The resulting
intermediate 9 undergoes then a reductive elimination reaction
forming the C–C bond, a process, which is less demanding in terms
of steric hindrance between secondary and tertiary allylic centers.
Unless stated otherwise, reactions were conducted in flame-
dried glassware under a vacuum. THF was distilled before to use
from sodium and benzophenone. Catalysts and ligands were pur-
chased from Strem Chemical, Inc. All commercially available re-
agents are used without further purification. Solvents after
reactions and extraction were evaporated in a rotatory evaporator
under vacuum (solvents were removed cooling at ꢁ20 ꢀC, in the
case of low boiling point or low molecular mass compounds). TLC
for reaction monitoring was performed on 60 F254 (Merck) with
detection by UV light and charring with KMnO4 or Pancaldi reagent.
1H and 13C NMR spectra were recorded by using Bruker-DPX-400 or
Bruker-ARX-400 spectrometer at 400 MHz and 100.6 MHz, re-
spectively, and are reported relative to Me4Si (
vents residual 1H-signal (CH–Cl3, (H) 7.27). Data for 1H NMR
spectra are reported as follows: chemical shift ( ppm), multiplicity,
d 0.0) or to the sol-
Cl
(THF)x
SO2Cl
d
+ PdCl2(PhCN)2
- SO2
- MCl
Cl Pd(N≡CPh)y
5 + cat.
d
Cl
SO2Cl
coupling constant (Hz), and integration. Data for 13C NMR spectra
reported in terms of chemical shift. IR spectra were recorded on
a Perkin–Elmer-1420 spectrometer and are reported in frequency
of absorption (cmꢁ1). High Resolution MALDI-TOF mass spectra
were obtained from the Institute of Molecular and Biology
Chemistry, Swiss Institute of Technology Mass Spectral Facility.
Compounds 1c,118 2a,62 2b,119 2d65 were prepared from known
methods.
favored Nu-M
7
Cl
PdL3
L3Pd Nu
+ PdL4
- SO2, -L
+ NuM
- MCl
5 + 6 + cat.
H
H
8
9
Scheme 3. Proposed mechanism for the desulfinylative allylation of Grignard reagents
and sodium enolates.
Depending on the nature of the leaving group of the crotyl and
3-buten-2-yl electrophiles and ligand significant degree of re-
tention of regiochemistry and stereochemistry has been observed
for palladium-catalyzed allylic alkylation.94,103–108
We thus examined the desulfinylative allylation of m-tolylMgCl
with 1-methylprop-2-enesulfonate (3c) and neopentyl (E)-2-
butenesulfonate (3d). Using Pd(PPh3)4 as catalyst (5 mol %) in
boiling THF, mixtures of 5bþ6b were obtained in 58 and 42% yields,
4.2. 1-Methylprop-2-ene-1-sulfonyl chloride (2c)
(CF3SO2)2NSiMe3 (0.78 mmol, 0.2 equiv) in anhyd CH3CN (5 mL)
was degassed by freeze-thaw cycles on the vacuum line. SO2
(78 mmol, 20 equiv), dried through column packed with P2O5 and
AlO3, wastransferredonthevacuum linetotheMeCN solutionfrozen
at ꢁ196 ꢀC. The mixture was allowed to melt and to warm to ꢁ40 ꢀC.
After 30 min at this temperature but-2-enyl(trimethyl)silane (1c)

508
C.M. Rao Volla et al. / Tetrahedron 65 (2009) 504–511
MgCl
Pd(PPh3)4 (5 mol%)
SO3R
+
+
THF, 80 °C (58%)
3c
5b
34:66
6b
R = neopentyl
MgCl
Pd(PPh3)4 (5 mol%)
SO3R
+
+
THF, 80 °C (42%)
3d
5b
81:19
6b
Scheme 4. Desulfinylative, regioselective allylic arylations with neopentyl sulfonates showing partial regioselectivity retention.
(3.9 mmol, 1 equiv) in MeCN (1 mL) was added slowly. The mixture
wasstirredatꢁ40 ꢀCfor6 h. Aftercoolingtoꢁ78 ꢀC, theexcessofSO2
and the solvent were evaporated under reduced pressure (10ꢁ3 Torr)
to dryness (ca. 1 h). Halogenating agent (NCS 4.7 mmol, 1.2 equiv,
dissolving in MeCN) was added to reaction mixture at ꢁ20 ꢀC. After
2 h at this temperature, allylsulfonyl chloride formed. The residue
was purified by flash chromatography (9:1 PE/EtOAc) to yield 68% as
colorless oil. IR (film): 2920,1360,1235,1160, 945, 735 cmꢁ1.1H NMR
4.5. Neopentyl (E)-but-2-ene-1-sulfonate (3d)
Applying the same procedure as for 3a, starting from 2d. FC (8:2
PE/EtOAc): 89% of 3d, light yellow oil. IR (film): 2960, 1480, 1350,
1160, 960, 935, 840, 630 cmꢁ1. 1H NMR (400 MHz, CDCl3):
d¼5.81
(m, 1H, H–C(2)), 5.47 (m, 1H, H–C(3)), 3.79 (s, 2H, H–C(10)), 3.70 (d,
2H, J¼7.31 Hz, H–C(2)), 1.71 (d, 3H, J¼6.41 Hz, H–C(4)), 0.91 (s, 9H,
H–C(30)). 13C NMR (100.6 MHz, CDCl3):
32.2, 26.5, 18.5. CIMS (NH3): m/z¼224 (100, [Mþ18]), 154 (10,
[Mꢁ52]), 71 (80, [Mꢁ135]). HRMS (MALDI-TOF): (C9H18O3SNaþ),
calcd: 229.0874; found: 229.0874.
d
¼136.5, 117.5, 79.7, 54.3,
(400 MHz, CDCl3):
d
¼5.98 (m,1H, H–C(3)), 5.62 (m, 2H, H–C(4)), 4.26
(m,1H, H–C(2)),1.72 (d, 3H, J¼6.78 Hz, H–C(1)).13C NMR (100.6 MHz,
CDCl3):
d¼132.5, 127.9, 77.5, 18.4. CIMS (NH3): m/z¼154 (27, [M]), 98
(100, [Mꢁ55]).
4.6. General procedure 1 for the desulfinylative allylation of
Grignard reagents with sulfonyl chlorides
4.3. Neopentyl 2-methylprop-2-ene-1-sulfonate (3a)
In a round bottom flask dried under vacuum was placed under
N2, the corresponding sulfonyl chloride (1 equiv), catalyst (5 mol %)
in THF (4 mL) at 25 ꢀC. Grignard reagent (1.5 equiv) was added
dropwise to this solution over 5–10 min. The reaction mixture was
stirred until complete disappearance of starting material. The re-
action mixture was added to satd aq soln of NH4Cl (15 mL) and
extracted with ether (15 mL, three times). The combined organic
layers were dried (Na2SO4), filtered, and concentrated under re-
duced pressure. The residue was purified by flash chromatography.
To a solution of methallylsulfonyl chloride 2a (8.36 g, 54 mmol,
1 equiv) in MeCN (14 mL) at 0 ꢀC were added neopentyl alcohol
(14.3 g, 0.16 mol, 3 equiv) and Et3N (11.4 mL, 81.1 mmol, 1.5 equiv).
The resulting mixture was warmed to 25 ꢀC and stirred for 2 h. The
reaction mixture was added to 50 mL of H2O and extracted with
EtOAc (70 mL, three times). The combined organic phases were
dried (Na2SO4), evacuated in vacuo. The residue was purified by FC
(8:2 PE/EtOAc): 10.4 g (93%), light yellow oil. IR (film): 2960, 1480,
1350, 1175, 965, 935, 840, 690 cmꢁ1
¼5.14 (s,1H, H–C(3)), 5.06 (s,1H, H–C(3)), 3.83 (s, 2H, H–C(1)), 3.73
(s, 2H, H–C(10)), 1.90 (s, 3H, Me–C(2)), 0.92 (s, 9H, H–C(30)). 13C NMR
(100.6 MHz, CDCl3):
.
1H NMR (400 MHz, CDCl3):
d
4.7. General procedure 2 for the desulfinylative allylation of
sodium enolates with sulfonyl chlorides
d
¼133.6,120.9, 79.6, 58.5, 32.2, 26.4, 22.7. CIMS
(NH3): m/z¼224 (100, [Mþ18]), 154 (10, [Mꢁ52]), 71 (80, [Mꢁ135]).
HRMS (MALDI-TOF): (C9H18O3SNaþ), calcd: 229.0874; found:
229.0875.
NaH (1.5 equiv) and either dimethyl malonate or methyl ace-
toacetate (1.5 equiv) were mixed in THF (3 mL) and stirred at 0 ꢀC
for 20 min. This solution was then added dropwise to a round
bottom flask containing sulfonyl chloride (1 equiv), catalyst
(0.05 equiv) in THF (3 mL) at 25 ꢀC. The reaction mixture was stir-
red until disappearance of starting material. The mixture was
added to cold H2O (15 mL) and extracted with ether (15 mL, three
times). The combined organic layers were dried (Na2SO4), filtered,
and concentrated under reduced pressure. The residue was purified
by flash chromatography.
4.4. Neopentyl 3-butene-2-sulfonate (3c)
Applying the same procedure as for the preparation of 3a,
starting from 2c. The residue was purified by FC (9:1 PE/Et2O) to
give 3c, 90%, as light yellow oil. IR (film): 2960, 1560, 1425, 1350,
1165, 960, 935, 830, 810, 655, 630 cmꢁ1. 1H NMR (400 MHz, CDCl3):
d
¼5.92 (m, 1H, H–C(3)), 5.40 (m, 2H, H–C(4)), 3.86 (s, 2H, H–C(10)),
3.82 (qn, 1H, J¼7.83 Hz, H–C(2)), 1.53 (d, 3H, J¼7.12 Hz, H–C(1)),
4.8. 1-Methyl-2-(2-methyl-2-propenyl)benzene (4a)58
0.95 (s, 9H, H–C(30)). 13C NMR (100.6 MHz, CDCl3):
d¼131.2, 121.3,
79.2, 60.2, 42.6, 26.0, 14.5. CIMS (NH3): m/z¼224 (100, [Mþ18]),
154 (10, [Mꢁ52]), 71 (80, [Mꢁ135]). HRMS (MALDI-TOF):
(C9H18O3SNaþ), calcd: 229.0874; found: 229.0883.
Using the general procedure 1 for the reaction using 1.0 M soln
of o-tolylmagnesium chloride (1.0 mL, 1.0 mmol, 1.5 equiv) with 2a
(0.1 g, 0.65 mmol, 1 equiv): 82 mg (87%), colorless oil. 1H NMR
E
E
[Ir(COD)Cl]2 (5 mol%)
SO2Cl
E = COOMe
E2CHNa
+
+
E
THF, 25 °C, 8 h
(61%)
E
2d
5c
20:80
6c
Scheme 5. Iridium-catalyzed regioselective allylation of dimethyl malonate salt with (E)-crotylsulfonyl chloride.

C.M. Rao Volla et al. / Tetrahedron 65 (2009) 504–511
509
(400 MHz, CDCl3):
(s, 1H, H–C(3)), 3.34 (s, 2H, H–C(1)), 2.30 (s, 3H, Me–arom.), 1.77 (s,
3H, Me–C(2)). 13C NMR (100.6 MHz, CDCl3):
d
¼7.16 (m, 4H, arom.), 4.84 (s, 1H, H–C(3)), 4.55
4.14. 1-Allyl-2-methylbenzene (4h)125
d¼144.6, 130.5, 130.2,
Using the general procedure 1 for the reaction using 1.0 M soln
of o-tolylmagnesium chloride (1.1 mL, 1.1 mmol, 1.5 equiv) with
sulfonyl chloride 2b (0.1 g, 0.72 mmol, 1 equiv): 72 mg (76%), col-
127.7, 127.2, 111.9, 42.2, 23.1, 19.8. CIMS (NH3): m/z¼146 (40, [M]),
131 (100, [Mꢁ15]), 91 (33, [Mꢁ55]).
orless oil. 1H NMR (400 MHz, CDCl3):
d
¼7.35–7.10 (m, 4H, arom.),
6.01 (m, 1H, H–C(2)), 5.12 (m, 2H, H–C(3)), 3.44 (d, J¼6.39 Hz, 2H,
H–C(1)), 2.34 (s, 3H, Me–arom.). CIMS (NH3): m/z¼132 (40, [M]), 91
(100, [Mꢁ41]).
4.9. (2-Methylallyl)benzene (4b)120
Using the general procedure 1 for the reaction using 1.8 M soln
of PhMgCl (0.56 mL, 1.0 mmol, 1.5 equiv) with 2a (0.1 g, 0.65 mmol,
1 equiv): 70 mg (82%), colorless oil. Using the general procedure 1
for the reaction using 0.5 M soln of phenylzinc bromide (2.0 mL,
1.0 mmol, 1.5 equiv) instead of Grignard reagent with 2a (0.1 g,
0.65 mmol, 1 equiv): 54 mg (57%), colorless oil. 1H NMR (400 MHz,
4.15. 4-Allylanisole (4i)126
Using the general procedure 1 for the reaction using 0.5 M soln
of p-methoxyphenylmagnesium bromide (2.2 mL, 1.1 mmol,
1.5 equiv) with 2b (0.1 g, 0.72 mmol, 1 equiv): 90 mg (85%), color-
CDCl3):
H–C(3)), 3.31 (s, 2H, H–C(1)), 1.67 (s, 3H, Me–C(2)). 13C NMR
(100.6 MHz, CDCl3):
d
¼7.40–7.05 (m, 5H, arom.), 4.84 (s, 1H, H–C(3)), 4.76 (s, 1H,
less oil. 1H NMR (400 MHz, CDCl3):
d
¼7.06 (d, J¼8.56 Hz, 2H, arom.),
6.80 (d, J¼8.56 Hz, 2H, arom.), 5.91 (m, 1H, H–C(2)), 4.97 (m, 2H, H–
C(3)), 3.71 (s, 3H, OMe), 3.26 (d, J¼6.59 Hz, 2H, H–C(1)). CIMS
(NH3): m/z¼148 (21, [M]), 147 (100, [Mꢁ1]), 132 (19, [Mꢁ16]), 91
(44, [Mꢁ57]).
d
¼139.8, 138.7, 128.9, 128.3, 126.1, 111.9, 44.7,
22.1. CIMS (NH3): m/z¼132 (91, [M]), 117 (100, [Mꢁ15]), 91 (49,
[Mꢁ55]).
4.10. 1-Methyl-3-(2-methyl-2-propenyl)benzene (4c)121
4.16. Dimethyl 2-(2-methyl-2-propenyl)malonate (4k)127
Using the general procedure 1 for the reaction using 1.0 M soln
of m-tolylmagnesium chloride (1.0 mL, 1.0 mmol, 1.5 equiv) with 2a
(0.1 g, 0.65 mmol, 1 equiv): 59 mg (62%), colorless oil. 1H NMR
Using the general procedure 2 for the reaction using NaH
(40 mg, 0.97 mmol, 1.5 equiv), dimethyl malonate (0.130 g,
0.97 mmol, 1.5 equiv) with 2a (0.1 g, 0.65 mmol, 1 equiv): 92 mg
(76%), colorless oil. 1H NMR (400 MHz, CDCl3):
d
¼4.76 (s, 1H, H–
(400 MHz, CDCl3):
d
¼7.05–6.88 (m, 4H, arom.), 4.88 (s, 1H, H–C(3)),
4.81 (s, 1H, H–C(3)), 3.35 (s, 2H, H–C(1)), 2.48 (s, 3H, Me–arom.),
1.75 (s, 3H, Me–C(2)). CIMS (NH3): m/z¼146 (56, [M]), 117 (100,
[Mꢁ15]), 91 (41, [Mꢁ55]).
C(3)), 4.69 (s,1H, H–C(3)), 3.74 (s, 6H, OMe), 3.59 (t, J¼7.7 Hz,1H, H–
CX2), 2.59 (d, J¼7.7 Hz, 2H, H–C(1)), 1.72 (s, 3H, Me–C(2)). 13C NMR
(100.6 MHz, CDCl3):
d
¼170.6, 139.8, 116.6, 49.2, 48.6, 38.1, 23.2.
CIMS (NH3): m/z¼204 (19, [Mþ18]), 171 (100, [Mꢁ15]), 155 (11,
4.11. 3-(4-Methoxyphenyl)-2-methylprop-2-ene (4d)122
[Mꢁ31]).
4.17. Methyl 2-acetyl-4-methyl-4-pentenoate (4l)128
Using the general procedure 1 for the reaction using 0.5 M soln
of p-methoxyphenylmagnesium bromide (2.0 mL, 1.0 mmol,
1.5 equiv) with 2a (0.1 g, 0.65 mmol, 1 equiv): 83 mg (79%), color-
Using the general procedure 2 for the reaction using NaH
(40 mg, 0.97 mmol, 1.5 equiv), methyl acetoacetate (0.11 g,
0.97 mmol, 1.5 equiv) with 2a (0.1 g, 0.65 mmol, 1 equiv): 86 mg
less oil. 1H NMR (400 MHz, CDCl3):
d
¼7.12 (d, J¼8.6 Hz, 2H, arom.),
6.85 (d, J¼8.6 Hz, 2H, arom.), 4.80 (s, 1H, H–C(1)), 4.73 (s, 1H, H–
(78%), colorless oil. 1H NMR (400 MHz, CDCl3):
d
¼4.70 (s, 1H, H–
C(1)), 3.81 (s, 3H, OMe), 3.28 (s, 2H, H–C(3)), 1.69 (s, 3H, Me–C(2)).
13C NMR (100.6 MHz, CDCl3):
d
¼158.0, 145.5, 131.8, 129.8, 113.7,
C(5)), 4.61 (s, 1H, H–C(5)), 3.64 (m, 4H, OMeþH–C(2)), 2.48 (m, 2H,
H–C(3)), 2.18 (s, 3H, Me–C(O)), 1.67 (s, 3H, Me–C(4)). 13C NMR
111.6, 55.3, 43.8, 21.9. CIMS (NH3): m/z¼180 (2, [Mþ18]), 163 (9,
(100.6 MHz, CDCl3):
d
¼202.7, 170.2, 142.1, 112.6, 58.3, 52.7, 36.1,
[Mþ1]), 162 (75, [M]), 146 (32, [Mꢁ16]).
26.3, 22.6. CIMS (NH3): m/z¼188 (85, [Mþ18]), 171 (100, [Mþ1]),
139 (14, [Mꢁ31]).
4.12. 1-(3-Methyl-3-butenyl)benzene (4e)123
4.18. Dimethyl 2-allylmalonate (4m)129
Using the general procedure 1 for the reaction using 1.3 M soln
of benzyl magnesium chloride (0.77 mL, 1.0 mmol, 1.5 equiv) with
2a (0.1 g, 0.65 mmol, 1 equiv): 71 mg (75%), colorless oil. 1H NMR
Using the general procedure 2 for the reaction using NaH
(43 mg, 1.07 mmol, 1.5 equiv), dimethyl malonate (0.13 g,
1.07 mmol, 1.5 equiv) with 2b (0.1 g, 0.72 mmol, 1 equiv): 114 mg
(92%), colorless oil. The spectral data (1H NMR and 13C NMR) of the
product are identical with those described in the literature for this
(400 MHz, CDCl3):
H–C(4)), 2.80 (m, 2H, H–C(1)), 2.35 (m, 2H, H–C(2)),1.80 (s, 3H, Me–
C(3)). 13C NMR (100.6 MHz, CDCl3):
d¼7.30–7.12 (m, 5H, arom.), 4.78–4.73 (m, 2H,
d
¼145.3, 142.1, 128.2, 128.1,
125.1, 110.0, 39.5, 34.1, 22.5. CIMS (NH3): m/z¼146 (9, [M]), 108 (14,
[Mꢁ38]), 91 (100, [Mꢁ55]).
compound.131 1H NMR (400 MHz, CDCl3):
d
¼5.71 (m, 1H, H–C(2)),
5.12 (m, 2H, H–C(3)), 3.74 (s, 6H, OMe), 3.48 (t, J¼7.2 Hz,1H, H–CX2),
2.67 (t, J¼7.4 Hz, 2H, H–C(1)). CIMS (NH3): m/z¼173 (9, [Mþ1]), 172
(100, [M]), 140 (6, [Mꢁ32]).
4.13. 1-(4-Methylpent-4-enyl)benzene (4f)124
Using the general procedure 1 for the reaction using 1.0 M soln
of 2-phenylethylmagnesium chloride (1.0 mLþ0.7 mL, 1.65 mmol,
2.5 equiv) with 2a (0.1 g, 0.65 mmol, 1 equiv): 65 mg (62%), color-
4.19. Methyl 2-acetylpent-4-enoate (4n)130
Using the general procedure 2 for the reaction using NaH
(43 mg, 1.07 mmol, 1.5 equiv), methyl acetoacetate (0.13 g,
1.07 mmol, 1.5 equiv) with 2b (0.1 g, 0.72 mmol, 1 equiv): 100 mg
less oil. 1H NMR (400 MHz, CDCl3):
d
¼7.23–7.11 (m, 5H, arom.), 4.75
(s, 1H, H–C(5)), 4.62 (s, 1H, H–C(5)), 2.53 (t, J¼7.85 Hz, 2H, H–C(1)),
1.98 (t, J¼7.41 Hz, 2H, H–C(3)), 1. 69 (m, 2H, H–C(2)), 1.65 (s, 3H,
(89%), colorless oil. 1H NMR (400 MHz, CDCl3):
d
¼5.76 (m, 1H, H–
Me–C(4)). 13C NMR (100.6 MHz, CDCl3):
d¼146.0, 142.8,128.7,128.6,
C(4)), 5.10 (m, 2H, H–C(5)), 3.74 (s, 3H, OMe), 3.54 (t, J¼7.1 Hz, 1H,
H–C(2)), 2.59 (m, 2H, H–C(3)), 2.21 (s, 3H, Me–C(O)). CIMS (NH3):
m/z¼174 (5, [Mþ18]), 156 (100, [M]), 142 (9, [Mꢁ14]).
126.0,110.3, 37.6, 35.7, 29.6, 22.7. CIMS (NH3): m/z¼160 (9, [M]), 144
(4, [Mꢁ26]), 104 (100, [Mꢁ56]).

510
C.M. Rao Volla et al. / Tetrahedron 65 (2009) 504–511
4.20. (E)-1-(But-2-enyl)-2-methylbenzene (5a)131 and 1-(but-
(m, 1H, H–C(4)), 5.03 (m, 2H, H–C(5)), 3.71 (s, 3H, OMe), 3.37 (d,
J¼9.50 Hz, 1H, H–C(2)), 2.96 (m, 1H, H–C(3)), 2.18 (s, 3H, Me), 1.09
(d, J¼6.66 Hz, 3H, Me–C(3)). CIMS (NH3): m/z¼171 (10, [Mþ1]þ),
170 (100, [M]þ), 151 (5, [Mꢁ19]þ), 126 (12, [Mꢁ44]þ).
3-en-2-yl)-2-methylbenzene (6a)101
Using the general procedure 1 for the reaction using 1.0 M soln
of o-tolylmagnesium chloride (1.0 mL, 1.0 mmol, 1.5 equiv) with 2c
(0.1 g, 0.65 mmol, 1 equiv): 65 mg (69%), colorless oil. Using the
general procedure 1 for the reaction using 1.0 M soln of o-tol-
ylmagnesium chloride (1.0 mL, 1.0 mmol, 1.5 equiv) with 2d (0.1 g,
0.65 mmol, 1 equiv): 71 mg (75%), colorless oil. 1H NMR (400 MHz,
Acknowledgements
We are grateful to the Swiss National Science Foundation (Bern)
and the Roche Research Foundation (Basel) for financial support.
We thank also Mr. F. Sepulveda, M. Rey and A. Razaname for their
technical help.
CDCl3) of 5a:
d
¼7.21 (s, 4H, arom.), 5.62 (m, 1H, H–C(2)), 5.48 (m,
1H, H–C(3)), 3.33 (d, 2H, 6.61 Hz, H–C(1)), 2.33 (s, 3H, Me–arom.),
1.71 (d, 3H, 6.38 Hz, H–C(4)). 1H NMR (400 MHz, CDCl3) of 6a:
d
¼7.21 (s, 4H, arom.), 6.02 (m, 1H, H–C(3)), 5.10 (m, 2H, H–C(4)),
References and notes
3.73 (qn, 1H, 6.98 Hz, H–C(2)), 2.33 (s, 3H, Me–arom.), 1.38 (d, 3H,
6.98 Hz, H–C(1)). CIMS (NH3): m/z¼147 (8, [Mþ1]), 146 (54, [M]),
105 (100, [Mꢁ41]), 91 (36, [Mꢁ55]).
1. Heck, R. F. Palladium Reagents in Organic Synthesis; Academic: New York, NY,
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4.21. (E)-1-(But-2-enyl)-3-methylbenzene (5b)132 and 1-(but-
3-en-2-yl)-3-methylbenzene (6b)133
Using the general procedure 1 for the reaction using 1.0 M soln
of m-tolylmagnesium chloride (1.0 mL, 1.0 mmol, 1.5 equiv) with 2c
(0.1 g, 0.65 mmol, 1 equiv): 53 mg (56%), colorless oil. Using the
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ylmagnesium chloride (1.0 mL, 1.0 mmol, 1.5 equiv) with 2d (0.1 g,
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CDCl3) of 5b:
d¼7.22–7.17 (m, 2H, arom.), 7.07–7.01 (m, 2H, arom.),
5.66 (m, 2H, H–C(2) and H–C(3)), 3.30 (d, 2H, J¼6.06 Hz, H–C(1)),
2.35 (s, 3H, Me–arom.), 1.70 (d, 3H, 5.76 Hz, H–C(4)). 1H NMR
(400 MHz, CDCl3) of 6b:
d
¼7.22–7.17 (m, 2H, arom.), 7.07–7.01 (m,
2H, arom.), 6.03 (m, 1H, H–C(3)), 5.07 (m, 2H, H–C(4)), 3.45 (qn, 1H,
J¼6.72 Hz, H–C(2)), 2.34 (s, 3H, Me-arom.), 1.37 (d, 3H, J¼6.96 Hz,
H–C(1)). CIMS (NH3): m/z¼147 (11, [Mþ1]), 146 (92, [M]), 131 (100,
[Mꢁ15]), 105 (19, [Mꢁ41]), 91 (28, [Mꢁ55]).
4.22. (E)-Dimethyl 2-(but-2-enyl)malonate (5c)129 and
dimethyl 2-(but-3-en-2-yl)malonate (6c)129
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Using the general procedure 2 for the reaction using NaH
(40 mg, 0.97 mmol, 1.5 equiv), dimethyl malonate (0.11 g,
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101 mg (84%), colorless oil. 1H NMR (400 MHz, CDCl3) of 5c:
d¼5.53
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J¼7.25 Hz, 1H, CHX2), 2.56 (m, 2H, H–C(1)), 1.62 (d, J¼6.45 Hz, 3H,
H–C(4)). 1H NMR (400 MHz, CDCl3) of 6c:
d
¼5.75 (m, 1H, H–C(3)),
5.04 (m, 2H, H–C(4)), 3.72 (s, 3H, OMe), 3.69 (s, 3H, OMe), 3.30 (d,
J¼8.53 Hz, 1H, CHX2), 2.94 (m, 1H, H–C(2)), 1.09 (d, J¼6.72 Hz, 3H,
H–C(1)). CIMS (NH3): m/z¼204 (12, [Mþ18]þ), 186 (100, [M]þ), 171
(15, [Mꢁ15]þ), 126 (57, [Mꢁ60]þ).
4.23. (E)-Methyl 2-acetylhex-4-enoate (5d)134 and methyl 2-
acetyl-3-methylpent-4-enoate (6d)134
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0.97 mmol, 1.5 equiv) with 2c (0.1 g, 0.65 mmol, 1 equiv): 87 mg
(79%), colorless oil. Using the general procedure 2 for the reaction
using NaH (40 mg, 0.97 mmol, 1.5 equiv), methyl acetoacetate
(0.13 g, 0.97 mmol, 1.5 equiv) with 2d (0.1 g, 0.65 mmol, 1 equiv):
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