Isoindolinone Synthesis: Selective Dioxane-Mediated Aerobic Oxidation of Isoindolines

Article abstract of DOI:10.1021/acs.joc.8b01920

N-Alkyl and N-aryl-isoindolinones were prepared by a dioxane-mediated oxidation of isoindoline precursors. The transformation exhibits unique chemoselectivity for isoindonlines. A chiral tertiary (3°)-benzylic position was not racemized during oxidation, and methyl indoprofen was prepared by late stage oxidation. Mechanistic studies suggest a selective H atom transfer, which avoids many known oxidation (by-)products of isoindolinones.

Full text of DOI:10.1021/acs.joc.8b01920

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Note
Isoindolinone Synthesis: Selective Dioxane-
Mediated Aerobic Oxidation of Isoindolines
Pawan Thapa, Esai Corral, Sinjinee Sardar, Brad S. Pierce, and Frank W. Foss
J. Org. Chem., Just Accepted Manuscript • DOI: 10.1021/acs.joc.8b01920 • Publication Date (Web): 20 Dec 2018
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The Journal of Organic Chemistry
Isoindolinone Synthesis: Selective Dioxane-Mediated Aerobic Oxidation of Isoindolines
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Pawan Thapa, Esai Corral, Sinjinee Sardar, Brad S. Pierce, Frank W. Foss Jr.*
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Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington 76019, TX,
USA
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ABSTRACT: N-alkyl and N-aryl-isoindolinones were prepared by a dioxane-mediated oxidation of
isoindoline precursors. The transformation exhibits unique chemoselectivity for isoindonlines. A chiral
3º-benzylic position was not racemized during oxidation, and methyl indoprofen was prepared by late
stage oxidation. Mechanistic studies suggest a selective H-atom transfer, which avoids many known
oxidation (by)products of isoindolinones.
1-8
Isoindolinones (phthalimidines) represent a growing class of benzofused -lactam natural products.
Synthetic and natural isoindolinones are medicinally relevant,9-11 and valuable building blocks for
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materials (Figure 1).
Figure 1: Valuable Isoindolinones
Approaches to isoindolinones overcome a variety of synthetic challenges derived from desired
substitution patterns. Phthalimide mono-reductions were directed by ortho-aromatic substituents, as in
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the total syntheses of staurosporine.
A variety of cyclization strategies build the lactam ring,
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including the halogenation or direct C-H activation and cyclization of o-methylbenzamides,
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reductive/condensative cyclizations,
carbonylative strategies.
Parham acylations,
cross-
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dehydrogenative coupling, and aryne mediated substitutions. A recent Bischler-Napieralski-type
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cyclization allowed the late stage construction of an isoindolinone in the total synthesis of
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lactonamycin. Recently, a method for 1º and 2º amine oxidation prepared unsubstituted isoindolinone
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in good yield. However, the oxidation of N-substituted isoindolines, 1, as demonstrated in this note, is
an underexplored approach to isoindolinones, 2. Many isoindoline 1 preparations involve reductions,
which may caution those attempting to improve redox economy; however, the accessibility of
isoindoline precursors are rarely more elaborate than current preparations of isoindolinones and recent
[2+2+2] cycloadditions access isoindolines (and some isoindolinones) with a variety of
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functionalization patterns.
Scheme 1: Isoindoline Oxidations
The conversion of isoindolines to isoindolinones presents a variety of potential oxidation byproducts—
including overoxidation to phthalimides,11,32-37 N-oxide formation, N-dealkylation,
or isoindole
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formation (Scheme 1). Here, we describe an unexpected catalyst-free and solvent-enhanced oxidation
method that provides synthetically useful yields of isoindolinones for a range of substrates. Significant
selectivity was found over phthalimide formation, which can form aerobically under basic conditions
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from isoindolinones.
We initially considered flavoperoxide mimics to examine the catalytic oxidation of isoindoline
derivatives, since flavoproteins oxidize amines to iminium intermediates in many monoamine
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oxidases. Furthermore, flavoperoxides occupy a space in oxidation potential between alkylperoxides
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and more powerful peroxyacids. The successful oxidation of a single benzylic site of isoindoline (1i)
with isoalloxazinium FLClO4 was observed in oxygenated DMF (table 1, entry 1)—with no over-
oxidization after 48 h at 100 °C; however, control reactions gave similar results Table 1, entry 2). In
fact, many polar aprotic solvents afforded positive results without catalyst (see also Table S1). 1,4-
Dioxane was best (91% yield in eight hours, 0% neat). The addition of various terminal oxidants did not
improve the initial dioxane conditions and bases shut down the production of desired product.
Interestingly, O2 atmospheres produced greater consumption of starting materials, but lower overall
yields than open air reactions. Dioxane autoxidation is a known process sometimes involved in fine
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catalytic methods,
therefore other peroxides were investigated in dioxanes and various polar aprotic
solvents. No additive performed better than 1,4-dioxane alone (see SI).
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Table 1: Select Reaction Condition Screeninga
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Entry solvent Temp. (°C) Time (h) Atmosphere FLClO4 (equiv) Conversion
Yield
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DMF
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Dioxane
Dioxane
Dioxane
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O2
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NA
NA
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91b, 86c, 83d
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aUnless otherwise stated, substrate 1i (0.2 mmol) in given solvent (0.15 M) in open air at given condition. CH2Br2 added as
NMR internal standard for conversion and yield calculations. bACS grade dioxane 1. cACS grade dioxane 2. dextra dry
dioxane.
Several isoindolines were prepared and oxidized in the air/dioxane system (Table 2). While 2-
arylisoindolines (1a-1g) gave moderate yields, 2-alkylisoindolines (1h-1m) provided more significant
yields in eight hours. Strongly electron withdrawing substrates, (1c, 1n) and protic substrates, (1b, 1s,
and 1y) afforded trace amounts of product on these time scales. Amino-substituted substrates were
unproductive with full consumption of substrate (e.g. 1b). Ortho-substitution on 2-aryl moieties had
little effect on reactivity (1d vs. 1f). Contrary to 2-(o-nitrophenyl)isoindoline (1c), 4-nitro-2-
phenylisoindoline (1p) formed isoindolinone in moderate yields and good selectivity. 5-methyl-2-
phenylisoindolinone (2o), unlike 2p, was formed in ca. 1:1 mixture of isomers. Again, amino
substitution of isoindoline (1q) decomposed under the reaction conditions. Chiral 1r, which contains a
competing tertiary-benzylic position, was oxidized to 2r with no significant racemization of the N-
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benzyl chiral center (2r
= -164.7 (0.1, CHCl3); lit. -161.3 (c 1.33, CHCl3). While bond dissociation
[휎]퐷
energies dominate H-atom abstraction rates, the relief of strain energy and relative sterics cannot be
overlooked; 2º C-H’s within cyclopentane have enhanced reactivity, while 3º-neopentyl C-H’s in
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acyclic systems are nearly unreactive. Furthermore, changes in degrees of freedom can effect relative
activation barriers, H-atom abstraction from cumene’s benzylic position has an A factor that is ca. a log
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order lower than that of the 3º hydrogen of 3-methylpentane. The special reactivity of isoindolines is
further demonstrated by the poor reactivity of 1s-1y. Secondary amines and tertiary amines with non-
benzylic substrates (1s, 1t and 1y) were non-productive substrates. Tetrahydroisoquinoline derived
substrates, containing a 6-membered ring, (1v and 1w) and isochroman (1x) produced modest yields,
even with increased temperatures and reactions times. Dibenzylisopropylamine 1aa gave low
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conversions to amide 2aa, with loss of one benzylic group. N-methylisoindolinone 2ab was formed in
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68% after five hours at 6.0 mmol scale.
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Table 2: Substrate Scopea
aReaction conditions: Isoindoline substrates 1a-1ab (0.25 mmol) in 0.15 M extra dry 1,4-dioxane,
isolated yield in parenthesis. bO2 balloon, 12 h. cO2 balloon, 4 h. d0.5 mmol scale. e68 h, 80 °C. f30%
isoindole product observed by NMR spectroscopy. g6.0 mmol scale reaction, O2 balloon, 5 h.
To explore the synthetic use of this process, a gram scale synthesis of 2i was performed (investigating
six and 120 h reaction times) with good yields and little isolated byproduct (Scheme 2). Methyl
indoprofen (2ac), a precursor to the discontinued analgesic and potential neuronal protectants,66 was
also prepared using this selective oxidation process (Scheme 3).
Scheme 2: N-phenylethylIsoindolinone synthesis
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aNMR conversion of 1i, bisolated yields
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Scheme 3: Synthesis of Methyl Indoprofen
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To understand the mechanism, various species were added to oxidations of substrate 1i (Scheme S1,
TEMPO, BHT, NBS, and N-tert-butyl-α-phenylnitrone (PBN)). TEMPO inhibited the transformation at
lower concentrations and formed isoindole (3i) with four equivalents. BHT, an H-atom donor capable of
suppressing autoxidation, formed no detectable product. Various sub-stoichiometric equivalents of NBS
were well tolerated. GC-MS analysis of the reaction progress revealed a 1i-O-O-PBN adduct mass (m/z
431.0 and predictable fragments (Scheme 4, entry 1). Because NMR and TLC experiments suggested
the presence of isoindoles, isoindole 3m (serendipitously isolated as a stable material from the
preparation of 1m) was resubmitted to the reaction conditions, yielding isoindolinone 2m quantitatively
(entry 2).Together, H-atom abstraction and conversion to isoindoles 3 was considered.
Scheme 4: Intermediate/Byproduct Investigation
Radical involvement was confirmed by a series of EPR experiments illustrated in Scheme 5. Reactions
carried out with excess (0.09 M) PBN spin-trap in dioxane formed a radical when heated. The
characteristic 14N-triplet (I = 1; 40.5 MHz) centered at a g-value of 2.007 (trace B) was typical of the
nitrogen-centered PBN-radical.67 Control reactions were performed in solvents where product formation
was not observed (ethyl acetate) with no PBN-radicals observed (trace C). When a reaction mixture
containing substrate 1i (0.022 mmol), dioxane (0.3 mL), and spin trap PBN (0.028 mmol) was heated,
an EPR analysis of aliquots taken from the reaction showed the PBN-radical. As compared to similar
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reactions performed at ambient temperature (AT), the amount of PBN-radical is greatly increased at
elevated temperatures (traces D and E). Double integration of these spectra indicates that the amount of
PBN-radical formed at AT is attenuated by nearly 85% relative to 50 °C reactions. Collectively, these
observations are consistent with the formation of radical reaction intermediates in reaction conditions
that lead to the isoindolinone product; while the 1i-OO-PBN adduct was detected, the exact identity of
the EPR observable radical specie has yet to be determined. A parallel kinetic isotope study (Scheme
S3) of 1i and 1,1,3,3-tetradeutero-1i (1i-D4) revealed a primary kinetic isotope effect
(KH/KD=3.88±0.11), indicating likely C1-H bond breaking in the rate determining step, which is
consistent with autoxidation processes.
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Scheme 5. EPR spectra for selected reaction conditionsa
(A) dioxane at 50 °C; (B) dioxane and PBN at 50 °C; (C) ethyl acetate, isoindoline, and PBN at 50 °C;
(D) dioxane, isoindoline, and PBN at 50 °C; (E) dioxane, isoindoline, and PBN at ambient temperature
(AT). Instrumental conditions: frequency, 9.65 GHz; modulation power, 20 mW; modulation
frequency, 0.3 mT.
Potentially operative mechanisms are summarized in Scheme 6 . Dioxane autooxidation products likely
form 8, initiating oxidation. Independent of additional solvent interactions, isoindoline radical 8 should
form 1-hydroperoxyisoindoline 12 (leading to the 1i-OO-PBN adduct). Alkylperoxide 12, like many
other secondary hydroperoxy species could proceed to the product 2 by a second H-atom transfer and
elimination of hydroxy radical, or by a non-radical intermolecular dehydration reaction between two
molecules of 12. When considering the TEMPO additive data, which shuts down product production,
one may favor a radical transformation over dimeric dehydration, which is slow in the presence of trace
protic species.68 Isoindole 3 formation is observed under autoxidation conditions. In a study of N-
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butylisoindole and O2 in methyl isopropyl ketone, a mixture of phthalimide, isoindolinone, and
hydroxyisoindolinone products were formed,69 whereas re-subjection of isoindole 3m to air/dioxane
reaction conditions quantitatively yields isoindolinone 2m. Whether isoindole 3 is part of the productive
pathway or a reversible thermodynamic sink is yet unknown.
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Dioxane is uniquely autooxidized compared to other ethers, due to the -effect from the additional ring
oxygen. This results in the relatively slow formation of bulk oxidants compared to THF and Et2O (see
SI), and rapid formation of 9 and O2 from two dioxane-OO., whereas, two THF-OO. molecules
decompose to lactone and acetal intermediates. Indeed, dioxane-O-1i adduct (10) is detected by GC-MS
of reactions, while THF reactions formed more peroxide content, a detectable dialkylperoxide THF-
OO-1i, and significantly lower yields of isoindolinone 2. Ether 10 is not isolated as a byproduct, and
could undergo elimination to 3, or a second H-atom transfer at the -C1 carbon, which can convert to 2.
Regardless, a general mechanism can be deduced from the bulk reaction investigation, leading to future
kinetic investigation.
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Scheme 6: Potential Mechanisms for Isoindoline Oxidation
In conclusion, we report a simple and synthetically useful oxidative strategy for the preparation of
isoindolinones from isoindolines. The solvent-mediated method uses O2 as the terminal oxidant and
requires no catalyst, it is selective (even over teriary-benzylic C-H’s and larger heterocyclic rings) and
avoids common (over)oxidation byproducts related to many other oxidants. Initial mechanistic studies
indicate an H-atom transfer rate-limiting process with potential for future catalyst/reagent design and
application to selective late stage oxidations of isoindolines to produce functional isoindolinones.
EXPERIMENTAL SECTION:
General Comments:
1H NMR spectra were recorded on 300 MHz and 500 MHz spectrometers and referenced to the internal
solvent signals (7.26 ppm in CDCl3). 13C NMR spectra were recorded on 75 MHz and 125 MHz
spectrometers referenced to the internal solvent signals (central peak 77.16 ppm in CDCl3).
Dibromomethane was used as internal standard for screening reaction condition (CDCl3, 4.8 ppm). NMR
data are reported as follows: chemical shift (in ppm, δ), integration, multiplicity (s = singlet, d = doublet,
t = triplet, q = quartet, m = multiplet, br = broad), coupling constant (in Hz, J). Reactions were monitored
by thin layer chromatography (TLC) on silica gel coated aluminum plates (EMD Merck F254, 250 mm
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thickness). Column chromatography was carried out with Silicycle Silicaflash P60 silica gel (mesh 230-
400). Melting points were measured in capillary tubes on a Mel-Temp II apparatus and were uncorrected.
IR spectra were collected in Bruker Alpha-P FT-IR Spectrometer by attenuated total reflectance on a
diamond sample plate. Electron Paramagnetic Spectroscopy (EPR) experiments were recorded on a
Bruker (Billerica, MA) EMX Plus spectrometer equipped with a bimodal resonator (Bruker model
4116DM). High resolution mass spectrometry (HRMS) experiments were performed in electrospray
ionization (ESI) mass spectrometry measurements using a TOF mass analyzer. GC-MS experiments were
obtained in Shimadzu Scientific Instruments, GCMS-QP2010, using electron impact ionization (EI) at
150 eV and a mass selective detector. All reagents were weighed and handled in air at room temperature.
Various grades of 1,4-Dioxane were purchased from Acros Organics, Alfa Aesar, and Sigma Aldrich, and
used without further purification, unless otherwise specified. Starting materials 1s, 1t, 1x and 1y are
commercially available and purchased from VWR and Fisher Scientific. N. B. Explosive peroxide
intermediates are known to form and accumulate due to heating and evaporation of peroxide
forming solvent. As such, appropriate safety measures should be taken into consideration. Larger scale
reactions were performed behind blast shield as a safety measure. Though reaction systems were tested at
elevated temperatures, for long periods, in oxygenated atmospheres, no explosions or accidents were
encountered during this study. All peroxide forming reagents were less than 12 months old, often freshly
purchased, and were tested with peroxide test strips prior to use.
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General Procedure for the Synthesis of Substrates 1a-n, 1r and 1ac:70
α,α’-dibromo-o-xylene (500 mg, 1.76 mmol) and aniline derivatives (1.76 mmol) were dissolved in 10
mL acetonitrile. Potassium carbonate (690 mg, 5.0 mmol) was then added to the reaction mixture. This
resulting mixture was stirred and heated at 60 °C for 18 hours under Argon atmosphere. After the
completion of reaction as indicated by TLC analysis, the precipitate was filtered, and the residue was
washed with 5 mL of acetonitrile. The filtrate was concentrated under reduced pressure, giving the
crude product, which was purified by column chromatography.
2-phenylisoindoline (1a):70
Yield 59% (202 mg); Rf = 0.44 (SiO2; hexanes: ethyl acetate, 10:1); White solid; mp 160-162 °C; IR
(neat, cm-1): 3038, 3040, 2923, 1588, 1463, 1181, 1091; 1H NMR (500 MHz, CDCl3) δ 7.39 – 7.31 (m,
6H), 6.79 (t, J = 7.1 Hz, 1H), 6.72 (d, J = 8.2 Hz, 2H), 4.68 (s, 4H); 13C NMR (125 MHz, CDCl3) δ
147.2, 138.0, 129.5, 127.2, 122.7, 116.2, 111.6, 53.8.
2-(2-amino)phenylisoindoline (1b):71
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Yield 54% (200 mg); Rf = 0.26 (SiO2; hexanes: ethyl acetate, 10:1); Pale brown solid; mp 100-101 °C;
IR (neat, cm-1): 3414, 3392, 2802, 1614, 1500, 1469; 1H NMR (500 MHz, CDCl3) δ 7.34 – 7.24 (m,
5H), 7.21 (dd, J = 8.3, 1.3 Hz, 1H), 6.99 – 6.95 (m, 1H), 6.83 – 6.76 (m, 2H), 4.48 (s, 4H), 3.99 (br,
2H); 13C NMR (125 MHz, CDCl3) δ 142.4, 139.9, 136.9, 127.0, 124.5, 122.4, 121.4, 120.5, 118.9,
115.8, 56.5.
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2-(2-nitro)phenylisoindoline (1c):71
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Yield 51% (215 mg); Rf = 0.37 (SiO2; hexanes: ethyl acetate, 10:1); Orange solid; mp 105-107 °C; IR
(neat, cm-1): 3055, 2922, 2902, 1512, 1512, 1463, 1377, 1255, 1174; 1H NMR (500 MHz, CDCl3) δ
7.70 (dd, J = 8.1, 1.7 Hz, 1H), 7.44 (ddd, J = 8.7, 7.1, 1.7 Hz, 1H), 7.29 (s, 4H), 7.02 (dd, J = 8.6, 1.0
Hz, 1H), 6.79 (ddd, J = 8.2, 7.1, 1.1 Hz, 1H), 4.66 (s, 4H); 13C NMR (125 MHz, CDCl3) δ 141.4,
138.08, 136.5, 133.0, 127.6, 126.7, 122.3, 116.4, 55.6.
2-(2-methyl)phenylisoindoline (1d):72
Yield 60% (220 mg); Rf = 0.47 (SiO2; hexanes: ethyl acetate, 10:1); White solid; mp 114-115 °C; IR
(neat, cm-1): 3043, 2911, 2852, 1520, 1371, 1254, 1163; 1H NMR (300 MHz, CDCl3) δ 7.40 – 7.32 (m,
4H), 7.30 – 7.24 (m, 2H), 7.14 (d, J = 8.0 Hz, 1H), 6.99 (t, J = 7.2 Hz, 1H), 4.69 (s, 4H), 2.53 (s, 3H);
13C NMR (75 MHz, CDCl3) δ 148.3, 139.2, 132.2, 129.4, 127.1, 126.8, 122.4, 121.2, 117.3, 56.6, 21.1.
2-(3-bromo)phenylisoindoline (1e):
Yield 49% (236 mg); Rf = 0.40 (SiO2; hexanes: ethyl acetate, 10:1); Pale yellow liquid; IR (neat, cm-1):
3045, 2966, 1589, 1489, 1479, 1467, 1388, 1217, 993; 1H NMR (500 MHz, CDCl3) δ 7.36 – 7.30 (m,
4H), 7.14 (t, J = 8.0 Hz, 1H), 6.85 (d, J = 7.8 Hz, 1H), 6.80 (s, 1H), 6.58 (d, J = 6.7 Hz, 1H), 4.63 (s,
4H); 13C NMR(125 MHz, CDCl3) δ 148.3, 137.5, 134.7, 130.6, 127.4, 122.7, 119.0, 114.4, 110.3, 53.8;
HRMS (ESI) calcd for C14H13BrN [M+H]+, 274.0226; found, 274.0232
2-benzylisoindoline (1h):72
Yield 66% (243 mg); Rf = 0.2 (SiO2; hexanes: ethyl acetate, 10:1); Pale brown liquid; IR (neat, cm-1):
3044, 2962, 1505, 1361, 1135; 1H NMR (500 MHz, CDCl3) δ 7.45 (d, J= 7.3 Hz, 2H), 7.38 – 7.34 (m,
2H), 7.31 (dt, J = 4.5, 1.8 Hz, 1H), 7.21 – 7.17 (m, 4H), 4.01 (s, 4H), 3.96 (s, 2H);13C NMR (125 MHz,
CDCl3) δ 140.3, 139.2, 128.9, 128.5, 127.2, 126.7, 122.4, 60.4, 59.0.
2-phenethylisoindoline (1i):73
Yield 69% (271 mg); Rf = 0.26 (SiO2; hexanes: ethyl acetate, 10:1); White solid; mp 60-61°C; IR (neat,
cm-1): 3026, 2949, 2882, 1495, 1357, 1120; 1H NMR (300 MHz, CDCl3-D) δ 7.85 (dd, J = 6.8, 1.0 Hz,
1H), 7.51 (td, J = 7.3, 1.4 Hz, 1H), 7.45 (td, J = 7.4, 0.9 Hz, 1H), 7.37 (d, J = 7.4 Hz, 1H), 7.33 – 7.21
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(m, 5H), 4.21 (s, 2H), 3.91 – 3.84 (m, 2H), 3.04 – 2.97 (m, 2H); 13C NMR (125 MHz, CDCl3) δ 140.3,
140.1, 128.7, 128.5, 126.7, 126.1, 122.3, 59.2, 58.0, 35.8
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2-octylisoindoline (1j):74
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Yield 63% (256 mg); Rf = 0.18 (SiO2; hexanes: ethyl acetate, 5:1); Pale brown liquid; IR (neat, cm-1):
3027, 2926, 2854, 1465, 1364, 1324, 1149; 1H NMR (500 MHz, CDCl3) δ 7.19 (m, 4H), 3.95 (s, 4H),
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2.74 – 2.70 (m, 2H), 1.63 – 1.57 (m, 2H), 1.40 – 1.25 (m, 10H), 0.89 (t, J = 7.0 Hz, 3H); 13C NMR (125
MHz, CDCl3) δ 139.8, 126.9, 122.4, 59.2, 56.4, 31.9, 29.7, 29.4, 28.8, 27.5, 22.8, 14.2.
2-butylisoindoline (1k):75
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Yield 61% (188 mg); Rf = 0.25 (SiO2; hexanes: ethyl acetate, 2:1); Pale brown liquid; IR (neat, cm-1):
3038, 2955, 2929, 1463, 1325, 1152; 1H NMR (500 MHz, CDCl3) δ 7.20 – 7.17 (m, 4H), 3.92 (s, 4H),
2.74 – 2.69 (m, 2H), 1.62 – 1.55 (m, 2H), 1.42 (m, 2H), 0.96 (t, J = 7.4 Hz, 3H); 13C NMR (125 MHz,
CDCl3) δ 140.35, 126.7, 122.3, 59.2, 56.1, 31.2, 20.7, 14.2.
2-cyclopropylIsoindoline (1l):76
Yield 46% (129 mg); Rf = 0.4 (SiO2; hexanes: ethyl acetate, 5:1); Colorless liquid; IR (neat, cm-1):
3082, 3007, 2935, 2796, 1462, 1348, 1016; 1H NMR (300 MHz, CDCl3) δ 7.19 (d, J = 0.8 Hz, 4H),
4.06 (s, 4H), 2.08 – 1.99 (m, 1H), 0.58 – 0.49 (m, 4H); 13C NMR (75 MHz, CDCl3) δ 140.3, 126.8,
122.5, 58.9, 35.6, 6.1.
2-adamantylisoindoline (1m):75
Yield 65% (290 mg); Rf = 0.25 (SiO2; hexanes: ethyl acetate, 5:1); White solid; mp 202-203 °C; IR
(neat, cm-1): 2900, 2846, 2770, 1486, 1356, 1282, 1149, 1081; 1H NMR (500 MHz, CDCl3) δ 7.23 –
7.16 (m, 4H), 4.11 (s, 4H), 2.14 (m, 3H), 1.82 (d, J = 2.7 Hz, 6H), 1.74 – 1.63 (m, 6H); 13C NMR (125
MHz, CDCl3) δ 139.6, 126.6, 122.6, 53.2, 50.2, 44.3, 39.2, 37.0, 36.3, 29.8, 29.5.
2-tosylisoindoline (1n):77
Prepared from corresponding monosodium salt of tosyl amide.
Yield 78% (355 mg); Rf = 0.36 (SiO2; hexanes: ethyl acetate, 10:1); White solid; mp 174-175 °C; IR
(neat, cm-1): 3074, 2974, 1720, 1469, 1344, 1170, 1080; 1H NMR (500 MHz, CDCl3) δ 7.77 (d, J = 8.3
Hz, 2H), 7.31 (d, J = 8.5 Hz, 2H), 7.25 – 7.21 (m, 2H), 7.19 – 7.15 (m, 2H), 4.62 (s, 4H), 2.40 (s, 3H);
13C NMR (125 MHz, CDCl3) δ 143.8, 136.2, 133.8, 129.9, 127.8, 127.7, 122.7, 53.8, 21.6.
(S)-2-(1-phenylethyl)isoindoline (1r):
Yield 59% (231 mg); Rf = 0.22 (SiO2; hexanes: ethyl acetate, 10:1); Pale pink solid; mp 42-44 °C; IR
(neat, cm-1): 3025, 2970, 2928, 1598, 1366, 1077; 1H NMR (500 MHz, CDCl3) δ 7.46 (d, J = 7.3 Hz,
2H), 7.38 (t, J = 7.5 Hz, 2H), 7.31 (t, J = 7.3 Hz, 1H), 7.22 – 7.16 (m, 4H), 3.98 (d, J = 11.3 Hz, 2H),
3.84 (d, J = 11.3 Hz, 2H), 3.67 (q, J = 6.5 Hz, 1H), 1.53 (d, J = 6.6 Hz, 3H); 13C NMR (125 MHz,
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CDCl3) δ 145.3, 140.1, 128.6, 127.4, 127.2, 126.7, 122.4, 65.5, 58.1, 23.4; HRMS (ESI) calcd for
C16H18N [M+H]+, 224.1434; found, 224.1434
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methyl 2-(4-(isoindolin-2-yl)phenyl)propanoate (1ac):
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Yield 62% (306 mg); Rf = 0.33 (SiO2; hexanes: ethyl acetate, 10:1); White solid; mp 124-126 °C; IR
(neat, cm-1): 3041, 2978, 2944, 1726, 1520, 1373, 1159, 1067; 1H NMR (500 MHz, CDCl3) 1H NMR
(500 MHz, CDCl3) δ 7.37 – 7.33 (m, 2H), 7.33 – 7.29 (m, 2H), 7.26 (d, J = 8.5 Hz, 2H), 6.65 (d, J = 8.6
Hz, 2H), 4.65 (s, 2H), 3.68 (q, 1H), 3.67 (s, 3H), 1.51 (d, J = 7.2 Hz, 3H); 13C NMR (125 MHz, CDCl3)
δ 175.8, 146.3, 138.0, 128.5, 128.1, 127.3, 122.7, 111.7, 53.9, 52.0, 44.6, 18.8; HRMS (ESI) calcd for
C18H20NO2 [M+H]+, 282.1489; found, 282.1485
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General Procedure for the Synthesis of Substrates 1f-g, 1o-q, 1u, 1z, and 1ab:70
An N-phenylpthalimide derivative (2.0 mmol) was dissolved in 10 mL distilled THF and stirred in an
ice/water bath at 0 °C. Over five minutes, 6 mL of 1M BH3 in THF (8 mmol) was added dropwise, to
the reaction mixture. The resulting solution was heated under reflux for 6 hours. After cooling the
reaction mixture to room temperature, methanol was carefully added dropwise until the residual solid
was dissolved. The resulting solution was diluted with 10 mL ethyl acetate. The combined organic
solution was washed with brine solution, dried with anhydrous sodium sulfate and concentrated under
reduced pressure. The crude product was purified by column chromatography.
2(4-methyl)phenylisoindoline (1f):70
Yield 71% (297 mg); Rf = 0.43 (SiO2; hexanes: ethyl acetate, 10:1); White solid; mp 120-121 °C; IR
(neat, cm-1): 3045, 2914, 2854, 1523, 1371, 1255, 1165; 1H NMR (300 MHz, CDCl3) δ 7.38 – 7.28 (m,
4H), 7.13 (d, J = 8.3 Hz, 2H), 6.64 (d, J = 8.4 Hz, 2H), 4.65 (s, 4H), 2.30 (s, 3H); 13C NMR (75 MHz,
CDCl3) δ 145.1, 142.1, 138.1, 130.0, 127.2, 122.6, 111.9, 54.3, 20.4.
2-(4-thiomethyl)phenylisoindoline (1g):
Yield 68% (328 mg); Rf = 0.32 (SiO2; hexanes: ethyl acetate, 10:1); Pale yellow solid; mp 210-211 °C;
IR (neat, cm-1): 3043, 2846, 2825, 1608, 1502, 1467, 1377, 1249, 1166; 1H NMR (500 MHz, CDCl3) δ
7.40 – 7.29 (m, 6H), 6.67 (d, J = 8.2 Hz, 2H), 4.66 (s, 4H), 2.44 (s, 3H); 13C NMR (125 MHz, CDCl3) δ
146.0, 137.6, 132.0, 127.4, 123.7, 122.7, 112.6, 54.3, 19.5; HRMS (ESI) calcd for C15H16NS [M+H]+,
241.0812; found, 241.0803
5-methyl-2-phenylisoindoline (1o):70
Yield 87% (364 mg); Rf = 0.4 (SiO2; hexanes: ethyl acetate, 10:1); White solid; mp 136-138 °C; IR
(neat, cm-1): 3060, 2951, 2853, 1596, 1496, 1374, 1160; 1H NMR (500 MHz, CDCl3) δ 7.31 (t, J = 7.9
Hz, 2H), 7.23 (d, J = 7.6 Hz, 1H), 7.16 (s, 1H), 7.12 (d, J = 8.0 Hz, 1H), 6.75 (t, J = 7.3 Hz, 1H), 6.68
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(d, J = 8.0 Hz, 2H), 4.62 (s, 4H), 2.40 (s, 3H); 13C NMR(125 MHz, CDCl3) δ 147.3, 138.2, 137.0,
135.0, 129.5, 128.1, 123.3, 122.4, 116.1, 111.6, 53.7, 53.6, 21.5.
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2-phenyl-4-nitroisoindoline (1p):70
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Yield 61% (293 mg); Rf = 0.5 (SiO2; hexanes: ethyl acetate, 5:1); Orange solid; mp 128-130 °C; IR
(neat, cm-1): 3053, 3036, 2953, 2922, 1692, 1593, 1524, 1489, 1381, 1344, 1297, 1276; 1H NMR (300
MHz, CDCl3) δ 8.19 (d, J = 8.6 Hz, 1H), 7.74 – 7.61 (m, 1H), 7.53 (m, 1H), 7.34 (m, 2H), 6.89 – 6.67
(m, 3H), 5.10 (s, 2H), 4.74 (s, 2H); 13CNMR (75 MHz, CDCl3) δ 146.4, 141.9, 135.1, 130.0, 129.6,
128.8, 123.0, 122.7, 117.0, 111.8, 55.1, 53.4; HRMS (ESI) calcd for C14H13N2O2 [M+H]+, 241.0972;
found, 241.0966
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2-methyl-2,3-dihydro-1H-benzo[de]isoquinoline (1u):78
Yield 60% (220 mg); Rf = 0.26 (SiO2; hexanes: ethyl acetate, 2:1); Pale brown solid; mp 60-61 °C; IR
(neat, cm-1): 3065, 2988, 2886, 1591, 1465, 1400, 1371, 1280; 1H NMR (500 MHz, CDCl3) δ 7.70 (d, J
= 8.2 Hz, 2H), 7.40 (dd, J = 8.1, 7.1 Hz, 2H), 7.21 (d, J = 6.8 Hz, 2H), 3.93 (s, 4H), 2.60 (s, 3H); 13C
NMR (125 MHz, CDCl3) δ 133.3, 133.2, 127.8, 126.3, 125.7, 122.1, 58.7, 45.5.
6-phenethyl-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine (1z):
Yield 33% (74 mg at 1.0 mmol scale of corresponding phthalimide); Rf = 0.15 (SiO2; dichloromethane:
methanol, 19:1); Yellow viscous oil; IR (neat, cm-1): 3059, 3025, 2927, 1663, 1602, 1495; 1H NMR
(500 MHz, CDCl3) δ 8.39 (d, J = 4.6 Hz, 1H), 7.49 (d, J = 7.5 Hz, 1H), 7.33 – 7.25 (m, 4H), 7.22 (t, J =
7.1 Hz, 1H), 7.10 (dd, J = 7.5, 5.1 Hz, 1H), 4.06 (s, 2H), 4.04 (s, 2H), 3.06 – 3.00 (m, 2H), 2.97 – 2.86
(m, 2H); 13C NMR (125 MHz, CDCl3) δ 161.4, 148.1, 140.0, 133.5, 130.2, 128.7, 128.5, 126.3, 121.8,
59.6, 57.9, 57.6, 35.4; HRMS (ESI) calcd for C15H17N2 [M+H]+, 225.1386; found, 225.1382
2-methylisoindoline(1ab):73
Caution, peroxide formation was not evaluated at various scales. Though no mishaps occurred
during the presented work, all substrates may undergo oxidation differently and should be scaled
with caution. Methods for evaluating total peroxide load can be found in the SI. Yield 80% (1.06 g
at 10.0 mmol scale of corresponding phthalimide); Rf = 0.24 (SiO2; hexanes: ethyl acetate, 1:1); Brown
liquid; IR (neat, cm-1): 3029, 2945, 2919, 1466, 1354, 1177; 1H NMR (500 MHz, CDCl3) δ 7.18 (s,
4H), 3.89 (s, 4H), 2.58 (s, 3H); 13C NMR (125 MHz, CDCl3) δ 140.5, 126.4, 121.9, 60.7, 42.1
General Procedure for the Synthesis of Substrate 1q:
To a cold solution of 2-phenyl-4-nitropthalimide (536 mg, 2.0 mmol) in dry THF (15 mL), was added
lithium aluminum hydride (304 mg, 8.0 mmol) in small portion. The resulting mixture was warmed to
room temperature and then refluxed under nitrogen. After the completion of reaction in 4 hours, the
reaction mixture was cooled to 0 °C, and carefully quenched with water (0.5 mL) and saturated Na2CO3
solution (1 mL). The white precipitate formed was filtered out and the filtrate was concentrated under
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reduced pressure. The crude product was purified by column chromatography (SiO2; hexanes: ethyl
acetate; 5:1; Rf =0.34) which afforded 58% (244 mg, 1.16 mmol) of 2-phenylsoindolin-4-amine (1q) as
brown solid.
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Similarly, deuterated substrate 1i-D4 was synthesized using LiAlD4 (1.0 mmol) reducing agent and
corresponding phthalimide (0.25 mmol) following similar procedure described above.
2-phenylisoindolin-4-amine (1q):
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Yield 58% (244 mg); Rf = 0.34 (SiO2; hexanes: ethyl acetate, 5:1); Brown solid; mp 120-122 °C; IR
(neat, cm-1): 3422, 3374, 3203, 3047, 3020, 2805, 1592, 1458, 1377, 1342, 1155; 1H NMR (500 MHz,
CDCl3) δ 7.43 – 7.38 (m, 2H), 7.20 (t, J = 7.7 Hz, 1H), 6.85 (dd, J = 15.8, 7.5 Hz, 2H), 6.74 (dd, J = 8.7,
0.9 Hz, 2H), 6.65 (dd, J = 7.9, 0.7 Hz, 1H), 4.66 (s, 2H), 4.51 (s, 2H), 3.64 (br, 2H); 13C NMR (125
MHz, CDCl3) δ 147.1, 141.2, 139.1, 129.3, 128.5, 123.0, 116.0, 113.4, 112.7, 111.5, 54.1, 51.4; HRMS
(ESI) calcd for C14H15N2 [M+H]+, 211.1120; found, 211.1124
1,1,3,3-tetradeuterated-2-phenethylisoindoline (1i-D4):
Yield 87% (49 mg); White solid; mp 71-72 °C; IR (neat, cm-1): 3057, 2948, 2901, 2387, 2171, 1600,
1454, 1303, 1260; 1H NMR (500 MHz, CDCl3) δ 7.41 – 7.27 (m, 4H), 3.12 – 3.03 (m, 2H), 3.02 – 2.95
(m, 2H); 13C NMR (125 MHz, CDCl3) δ 140.1, 139.7, 128.8, 128.5, 126.9, 126.3, 122.4, 57.9, 35.6;
HRMS (ESI) calcd for C16H14D4N [M+H]+, 228.1690; found, 228.1677
General Procedure for the Synthesis of Substrate 1v:79
CuI (95 mg, 0.5 mmol), K3PO4 (2.1 g, 10 mmol), and a stir bar were charged into a flame-dried (100
mL) round-bottom flask. The flask was evacuated and back filled with argon. This process was repeated
three times. At room temperature, 5 mL of isopropanol, ethylene glycol (560 μL, 10 mmol),
tetrahydroisoquinoline (1.0 g, 950 μL, 7.5 mmol) and iodobenzene (1.0 g, 557 μL, 5 mmol) were then
added successively via syringe. The reaction mixture was heated to 90 °C and stirred for a day. After
completion of the reaction, 10 mL diethyl ether followed by 10 mL water was added to the reaction
flask. The aqueous layer was extracted by Et2O (2x10 mL). The combined organic phase was washed
with brine solution, dried over anhydrous MgSO4, filtered and then concentrated under reduced pressure.
The crude residue was purified by column chromatography (SiO2; hexanes: ethyl acetate, 15:1; Rf =
0.33) to afford 82% (257.3 mg, 4.1 mmol) of N-phenyl-1,2,3,4-tetrahydroisoquinoline (1v) as colorless
liquid.
N-phenyl-1,2,3,4-tetrahydroisoquinoline (1v):79
Yield 82% (257.3 mg); Rf = 0.33 (SiO2; hexanes: ethyl acetate, 15:1); Colorless liquid; 1H NMR (500
MHz, CDCl3) δ 7.31 (dd, J = 11.7, 4.3 Hz, 1H), 7.22 – 7.16 (m, 2H), 7.00 (d, J = 8.6 Hz, 1H), 6.85 (t, J
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= 7.3 Hz, 1H), 4.43 (s, 0H), 3.58 (t, J = 5.7 Hz, 1H), 3.01 (t, J = 5.9 Hz, 1H); 13C NMR (125 MHz,
CDCl3) δ 150.6, 135.0, 134.6, 129.3, 128.6, 126.6, 126.4, 126.1, 118.7, 115.2, 50.8, 46.6, 29.2.
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General Procedure for the Synthesis of Substrate 1w:80
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To a mixture of 2-(3,4-dimethoxyphenyl)-N-methylethanamine (975 mg, 5.0 mmol) and 37% aqueous
solution of formaldehyde (1.4 mL, 29.0 mmol), was added 5 mL formic acid at room temperature. The
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resulting mixture was heated at 100 °C for 4 hours. The solution was poured into ice-water and adjusted
to pH =11 by the addition of 2M sodium hydroxide solution. The solid formed was extracted with
dichloromethane (15 mL x 2). The combined organic phase was dried with anhydrous Na2SO4 and
concentrated under reduced pressure. The crude product was purified with column chromatography
(SiO2; ethyl acetate: methanol, 4:1; Rf = 0.24) to afford 88% (910 mg, 4.4 mmol) of (1w) as pale-yellow
solid.
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6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinoline (1w):80
Yield 88% (910 mg); Rf = 0.24 (SiO2; ethyl acetate: methanol, 4:1); Pale yellow solid; mp 70-71 °C; IR
(neat, cm-1): 3045, 2968, 1485, 1375, 1220, 1004; 1H NMR (500 MHz, CDCl3) δ 6.57 (s, 1H), 6.48 (s,
1H), 3.81 (s, 3H), 3.80 (s, 3H), 3.49 (s, 2H), 2.82 (t, J = 5.8 Hz, 2H), 2.64 (t, J = 5.9 Hz, 2H), 2.43 (s,
3H); 13C NMR (125 MHz, CDCl3) δ 147.5, 147.1, 126.4, 125.6, 111.3, 109.2, 57.5, 55.9, 55.9, 52.9,
46.0, 28.7
General procedure for synthesis of isoindolinone derivatives:
To a flame dried and cooled to room temperature 10 mL round bottomed flask was added isoindoline
(0.25 mmol) followed by 1.5 mL 1,4-dioxane. The reaction mixture was heated for 8 hours at 50 °C in
open air. After the completion of the reaction, as determined by thin layered chromatography, the
mixture was directly concentrated under reduced pressure. The crude product was purified by column
chromatography.
Note: In one particular example of isoindolinone 2i, work up procedure was slightly modified. After the
reaction was complete, the reaction solution was diluted by adding 2 mL deionized water. The resulting
solution was extracted using 2 mL dichloromethane twice. The combined organic layer was dried in
anhydrous Na2SO4. The dried organic layer was concentrated and purified by column chromatography
in silica gel using hexanes and ethyl acetate as mobile phase to afford 2i in 63% isolated yield.
Reactions under O2 balloon were set up like the procedure described above except that the flask was
purged with O2 for three cycles and sealed properly with the septum.
For a gram scale reaction with substrate 1i, 1i (1.78 g, 8.0 mmol) was added into flame-dried 100 mL
round bottom flask. 50 mL of 1,4-dioxane was added in the flask. The resulting solution was then heated
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in oil bath at 50 °C in open air for 6 hours. The solution was concentrated under reduced pressure and
the crude product was purified by column chromatography (SiO2; hexanes: ethyl acetate; 5:1; Rf = 0.1)
to afford 59% (1.12 g, 4.72 mmol) of 2-phenethylisoindolin-1-one (2i) as white solid.
2-phenylisoindolin-1-one (2a):12
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Yield 55% (28.7 mg); Rf = 0.25 (SiO2; hexanes: ethyl acetate, 10:1); White solid; mp 161-162 °C; IR
(neat, cm-1): 3042, 2924, 1683, 1594, 1491,1329, 1265, 1222,1151; 1H NMR (500 MHz, CDCl3) δ 7.93
(d, J = 7.4 Hz, 1H), 7.87 (dd, J = 8.8, 1.1 Hz, 2H), 7.62 – 7.58 (m, 1H), 7.53 – 7.49 (m, 2H), 7.45 – 7.41
(m, 2H), 7.18 (tt, J = 7.6, 1.1 Hz, 1H), 4.87 (s, 2H); 13C NMR (125 MHz, CDCl3) δ 167.6, 140.2, 139.5,
133.3, 132.1, 129.2, 128.4, 124.5, 124.2, 122.7, 119.5, 50.8.
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2-(o-tolyl)isoindolin-1-one (2d):12
Yield 64% (35.7 mg); Rf = 0.28 (SiO2; hexanes: ethyl acetate; 10:1); White solid; mp 129-130 °C; IR
(neat, cm-1): 3053, 2955, 2924, 1685,1602, 1451, 1388, 1302, 1213, 1123; 1H NMR (300 MHz, CDCl3)
δ 7.95 (dd, J = 7.1, 1.2 Hz, 1H), 7.60 (ddd, J = 6.9, 6.5, 1.3 Hz, 1H), 7.55-7.48 (m, 2H), 7.33-7.23 (m,
4H), 4.72 (s, 2H), 2.25 (s, 3H); 13C NMR (75 MHz, CDCl3) δ 167.7, 141.6, 137.0, 136.4, 132.5, 131.7,
131.3, 128.3, 128.3, 127.5, 126.9, 124.3, 122.9, 53.1, 18.3.
2-(3-bromophenyl)isoindolin-1-one (2e):12
Yield 49% (35.2 mg); Rf = 0.41 (SiO2; hexanes: ethyl acetate; 10:1); Pale brown solid; mp 178-180 °C;
IR (neat, cm-1): 3113, 3044, 2950, 1689, 1561,1432, 1374, 1299, 1197, 1091; 1H NMR (500 MHz,
CDCl3) δ 8.07 – 8.04 (m, 1H), 7.92 (dd, J = 8.0, 1.4 Hz, 1H), 7.89 (dt, J = 6.8, 2.2 Hz, 1H), 7.64 – 7.60
(m, 1H), 7.54 – 7.50 (m, 2H), 7.31 – 7.28 (m, 2H), 4.84 (s, 2H); 13C NMR(125 MHz, CDCl3) δ 167.6,
140.9, 139.9, 132.9, 132.5, 130.5, 128.6, 127.3, 124.4, 123.0, 122.7, 122.0, 117.7, 50.6.
2-(p-tolyl)isoindolin-1-one (2f):81
Yield 61% (34 mg); Rf = 0.24 (SiO2; hexanes: ethyl acetate; 10:1); White solid; mp 125-126 °C; IR IR
(neat, cm-1): 3140, 2918, 1660, 1512, 1390, 1305; 1H NMR (500 MHz, CDCl3) δ 7.92 (d, J = 7.3 Hz,
1H), 7.74 (d, J = 8.5 Hz, 2H), 7.62 – 7.56 (m, 1H), 7.53 – 7.48 (m, 2H), 7.23 (d, J = 8.3 Hz, 2H), 4.84
(s, 2H), 2.36 (s, 3H); 13C NMR (125 MHz, CDCl3) δ 167.4, 140.2, 137.0, 134.3, 133.4, 132.0, 129.7,
128.4, 124.2, 122.6, 119.7, 50.9, 20.9.
2-(4-(methylthio)phenyl)isoindolin-1-one (2g):12
Yield 63% (80.3 mg); Rf = 0.19 (SiO2; hexanes: ethyl acetate; 5:1); Pale yellow solid; mp 168-170 °C;
IR (neat, cm-1): 2922, 1685, 1492, 1440, 1386, 1336, 1222, 1155, 1060; 1H NMR (500 MHz, CDCl3) δ
7.92 (dd, J = 6.8, 1.7 Hz, 1H), 7.81 (d, J = 8.9 Hz, 2H), 7.62 – 7.58 (m, 1H), 7.51 (m, 2H), 7.34 (d, J =
8.9 Hz, 2H), 4.84 (s, 1H), 2.51 (s, 1H); 13C NMR (125 MHz, CDCl3) δ 167.5, 140.1, 137.2, 134.0,
133.3, 132.2, 128.5, 128.1, 124.2, 122.7, 120.1, 50.8, 16.7.
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2-benzylisoindolin-1-one (2h):10
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Yield 61% (34 mg); Rf = 0.15 (SiO2; hexanes: ethyl acetate; 10:1); White solid; mp 86-87 °C; IR (neat,
cm-1): 3028, 2977, 1670, 1567,1494, 1316, 1255, 1158; 1H NMR (500 MHz, CDCl3) δ 7.90 (d, J = 7.5
Hz, 1H), 7.52 (td, J = 7.5, 1.0 Hz, 1H), 7.47 (t, J = 7.3 Hz, 1H), 7.38 (d, J = 7.4 Hz, 1H), 7.35 – 7.27 (m,
5H), 4.81 (s, 2H), 4.27 (s, 2H); 13C NMR (125 MHz, CDCl3) δ 168.6, 141.3, 137.1, 132.7, 131.4, 128.9,
128.3, 128.1, 127.8, 124.0, 122.8, 49.5, 46.5.
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2-phenethylisoindolin-1-one (2i):82
Yield 68% (40.3 mg); Rf = 0.1 (SiO2; hexanes: ethyl acetate; 5:1); White solid; mp 93-95 °C; IR (neat,
cm-1): 3059, 2913, 1671, 1448, 1409, 1303, 1211, 1127; 1H NMR (300 MHz, CDCl3) δ 7.85 (d, J = 7.2
Hz, 1H), 7.51 (td, J = 7.3, 1.4 Hz, 1H), 7.45 (t, J = 7.1 Hz, 1H), 7.37 (d, J = 7.3 Hz, 1H), 7.33 – 7.21 (m,
5H), 4.21 (s, 2H), 3.88 (t, J = 7.3 Hz, 2H), 3.00 (t, J = 7.3 Hz, 2H); 13C NMR (125 MHz, CDCl3) δ
168.6, 141.2, 138.9, 133.0, 131.3, 128.8, 128.7, 128.1, 126.6, 123.7, 122.7, 50.7, 44.2, 35.0.
2-octylisoindolin-1-one (2j):33
Yield 69% (42.3 mg); Rf = 0.2 (SiO2; hexanes: ethyl acetate; 5:1); Pale yellow liquid; IR (neat, cm-1):
3038, 2923, 1680, 1468, 1226, 1105; 1H NMR (500 MHz, CDCl3) δ 7.84 (dd, J = 7.4, 1.0 Hz, 1H), 7.51
(td, J = 7.5, 1.2 Hz, 1H), 7.46 – 7.42 (m, 2H), 3.60 (t, J = 7.4 Hz, 2H), 1.71 – 1.60 (m, 2H), 1.34 – 1.23
(m, 10H), 0.86 (t, J = 7.0 Hz, 3H); 13C NMR (125 MHz, CDCl3) δ 168.5, 141.2, 133.2, 131.1, 128.0,
123.7, 122.7, 50.0, 42.5, 31.9, 29.4, 29.3, 28.5, 27.0, 22.7, 14.2.
2-butylisoindolin-1-one (2k):75
Yield 63% (30 mg); Rf = 0.2 (SiO2; hexanes: ethyl acetate; 5:1); Pale yellow liquid; IR (neat, cm-1):
3047, 2957, 1675, 1469, 1377, 1210, 1172, 1094; 1H NMR (500 MHz, CDCl3) δ 7.84 (dd, J = 7.5, 2.2
Hz, 1H), 7.52 (td, J = 7.5, 1.2 Hz, 1H), 7.47 – 7.42 (m, 2H), 4.37 (s, 2H), 3.62 (t, J = 7.3 Hz, 2H), 1.70 –
1.59 (m, 2H), 1.44 – 1.32 (m, 2H), 0.95 (t, J = 7.4 Hz, 3H); 13C NMR (125 MHz, CDCl3) δ 168.5,
141.2, 133.2, 131.2, 128.1, 123.7, 122.7, 50.0, 42.2, 30.6, 20.2, 13.9.
2-cyclopropylisoindolin-1-one (2l):75
Yield 70% (30.2 mg); Rf = 0.28 (SiO2; hexanes: ethyl acetate; 5:1); Pale yellow solid; mp 51-52 °C; IR
(neat, cm-1): 3088, 3014, 2914, 2868, 1678,1409, 1371, 1213, 1155, 1056; 1H NMR (500 MHz, CDCl3)
δ 7.81 (d, J = 7.6 Hz, 1H), 7.50 (td, J = 7.4, 1.2 Hz, 1H), 7.45 – 7.38 (m, 2H), 4.31 (s, 2H), 2.96 – 2.90
(m, 1H), 0.94 – 0.89 (m, 2H), 0.88 – 0.83 (m, 2H); 13C NMR (75 MHz, CDCl3) δ 169.8, 141.1, 133.3,
131.4, 128.1, 123.6, 122.7, 50.5, 25.2, 5.7.
2-(adamantan-1-yl)isoindolin-1-one (2m):
Yield 85% (56 mg); Rf = 0.18 (SiO2; hexanes: ethyl acetate; 5:1); White solid; mp 221-222 °C; IR
(neat, cm-1): 2940, 2892, 1688, 1483, 1402, 1330; 1H NMR (500 MHz, CDCl3) δ 7.78 (d, J = 7.5 Hz,
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1H), 7.49 (td, J = 7.4, 1.2 Hz, 1H), 7.41 (m, 2H), 4.46 (s, 2H), 2.31 (d, J = 2.7 Hz, 6H), 2.18 – 2.14 (m,
3H), 1.80 – 1.69 (m, 6H); 13C NMR (125 MHz, CDCl3) δ 168.9, 141.0, 134.8, 130.9, 127.9, 123.3,
122.4, 55.6, 47.6, 40.2, 36.5, 29.7; HRMS (ESI) calcd for C18H21NONa [M+Na]+, 290.1515; found,
290.1509
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5(6)-methyl-2-phenylisoindolin-1-one (2o):12
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Yield 66% (36.8 mg) (45:55); Rf = 0.38 (SiO2; hexanes: ethyl acetate; 5:1); White solid; IR (neat, cm-1):
3060, 3041, 2923, 1679, 1620, 1493, 1453, 1375, 1294, 1165, 1122;
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I: 6-methyl-2-phenylisoindolin-1-one: H NMR (500 MHz, CDCl3) δ 7.89 – 7.85 (m, 2H), 7.73 (s,
1H), 7.45 – 7.41 (m, 4H), 7.20 – 7.15 (m, 1H), 4.82 (s, 2H), 2.49 (s, 3H); 13C NMR (125 MHz,CDCl3) δ
167.8, 139.8, 138.5, 137.4, 133.5, 133.2, 129.5, 124.4, 124.4, 122.4, 119.5, 50.7, 22.1.
1
II: 5-methyl-2-phenylisoindolin-1-one: H NMR (500 MHz, CDCl3) δ 7.89 – 7.85 (m, 2H), 7.81 (d, J =
8.2 Hz, 1H), 7.40 (s, 2H), 7.31 (d, J = 6.4 Hz, 2H), 7.20 – 7.15 (m, 1H), 4.82 (s, 2H), 2.47 (s, 3H); 13C
NMR (125 MHz,CDCl3) δ 167.7, 142.9, 140.6, 139.7, 130.8, 129.2, 124.5, 124.1, 123.2, 120.4, 119.5,
50.7, 21.5.
4-nitro-2-phenylisoindolin-1-one (2p):
Yield 55% (34.9 mg); Rf = 0.22 (SiO2; hexanes: ethyl acetate; 5:1); Orange solid; mp 142-143 °C; IR
(neat, cm-1): 3051, 3036, 2919, 2851, 1692, 1523, 1344, 1145; 1H NMR (500 MHz, CDCl3) δ 8.47 (d, J
= 8.0 Hz, 1H), 8.28 (d, J = 7.5 Hz, 1H), 7.91 (d, J = 7.8 Hz, 2H), 7.76 (t, J = 7.8 Hz, 1H), 7.48 (t, J = 8.0
Hz, 2H), 7.25 (t, J = 7.4 Hz, 2H), 5.35 (s, 2H); 13C NMR (125 MHz, CDCl3) δ 164.9, 138.6, 136.7,
135.9, 130.5, 130.2, 129.5, 127.4, 126.7, 125.5, 119.9, 51.9; HRMS (ESI) calcd for C14H11N2O3
[M+H]+, 255.0764; found, 255.0763
(S)-2-(1-phenylethyl)isoindolin-1-one (2r):63
Yield 58% (34.4 mg); Rf = 0.18 (SiO2; hexanes: ethyl acetate; 5:1); Pale brown solid; mp 144-145 °C;
IR (neat, cm-1): 3087, 2986, 1668, 1497, 1347,1161; 1H NMR (500 MHz, CDCl3) δ 7.88 (d, J = 7.4 Hz,
1H), 7.50 (td, J = 7.4, 1.3 Hz, 1H), 7.45 (t, J = 7.3 Hz, 1H), 7.39 – 7.32 (m, 5H), 7.28 (dt, J = 4.7, 2.1
Hz, 1H), 5.82 (q, J = 7.3 Hz, 1H), 4.33 (d, J = 17.0 Hz, 1H), 4.00 (d, J = 17.0 Hz, 1H), 1.70 (d, J = 7.1
Hz, 3H); 13C NMR (125 MHz, CDCl3) δ 168.2, 141.4, 140.8, 133.0, 131.3, 128.8, 128.1, 127.7, 127.2,
123.9, 122.9, 49.2, 45.7, 17.4; [α]D -167 (c 0.1, CH2Cl2) and -164.7 (c 0.1, CHCl3) {Ref: -161.3 (c 1.33,
CHCl3)}46
2-methyl-1H-benzo[de]isoquinoline-1,3(2H)-dione (2u):83
Yield 37% (39 mg); Rf = 0.3 (SiO2; hexanes: ethyl acetate; 5:1); White solid; mp 206-207 °C; IR (neat,
cm-1): 3070, 2954,1697,1588,1439, 1397,1279, 1232, 1201, 1182, 1033; 1H NMR (500 MHz, CDCl3) δ
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8.61 (dd, J = 7.3, 1.1 Hz, 2H), 8.21 (dd, J = 8.4, 1.0 Hz, 2H), 7.76 (dd, J = 8.2, 7.2 Hz, 2H), 3.57 (s,
3H); 13C NMR (125 MHz, CDCl3) δ 164.6, 134.1, 131.7, 131.3, 128.1, 127.0, 122.7, 27.1.
2-phenyl-3,4-dihydroisoquinolin-1(2H)-one (2v):84
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Yield 46% (25.7 mg); Rf =0.13 (SiO2; hexanes: ethyl acetate; 5:1); Pale brown solid; mp 100-101 °C;
IR (neat, cm-1): 3059, 3036, 2926, 1647, 1594, 1466, 1456, 1407, 1316, 1307, 1276, 1254, 1220, 1169,
9
1064; 1H NMR (500 MHz, CDCl3) δ 8.16 (d, J = 7.7 Hz, 1H), 7.47 (td, J = 7.5, 1.3 Hz, 1H), 7.44 – 7.36
(m, 5H), 7.28 – 7.23 (m, 2H), 3.99 (t, J = 6.5 Hz, 2H), 3.14 (t, J = 6.5 Hz, 2H); 13C NMR (125 MHz,
CDCl3) δ 164.3, 143.2, 138.4, 132.1, 129.8, 129.0, 128.8, 127.2, 127.0, 126.3, 125.4, 49.5, 28.7.
6,7-dimethoxy-2-methyl-3,4-dihydroisoquinolin-1(2H)-one (2w):85
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Yield 31% (17 mg); Rf = 0.15 (SiO2; hexanes: ethyl acetate; 2:1); White solid; mp 123-125 °C; IR
(neat, cm-1): 2924, 2886, 1640, 1508, 1435, 1275, 1016; 1H NMR (301 MHz, CDCl3) δ 7.59 (s, 1H),
6.62 (s, 1H), 3.92 (s, 3H), 3.91 (s, 3H), 3.54 (t, J = 6.8 Hz, 2H), 3.13 (s, 3H), 2.93 (t, J = 6.7 Hz, 2H);
13C NMR (125 MHz, CDCl3) δ 165.1, 151.8, 148.0, 131.7, 121.9, 110.6, 109.3, 56.2, 56.1, 48.5, 35.4,
27.6.
isochroman-1-one (2x):86
Yield 32% (11.8 mg); Rf = 0.35 (SiO2; hexanes: ethyl acetate; 5:1); Pale yellow liquid; IR (neat, cm-1):
3071, 2990,1714, 1605, 1470, 1391, 1291, 1193, 1118, 1089; 1H NMR (500 MHz, CDCl3) δ 8.09 (dd, J
= 7.8, 1.3 Hz, 1H), 7.53 (td, J = 7.5, 1.4 Hz, 1H), 7.41 – 7.36 (m, 1H), 7.26 (d, J = 7.6 Hz, 1H), 4.55 –
4.51 (m, 2H), 3.06 (t, J = 6.0 Hz, 2H); 13C NMR (125 MHz, CDCl3) δ 165.2, 139.6, 133.7, 130.5,
127.8, 127.3, 125.4, 67.4, 27.9.
N-isopropylbenzamide (2aa):87
Yield 28% (11.4 mg); Rf = 0.1 (SiO2; hexanes: ethyl acetate; 5:1); White solid; mp 100-101 °C; IR
(neat, cm-1): 3292, 3029, 2930, 1627, 1577, 1346, 1168; 1H NMR (500 MHz, CDCl3) δ 7.75 (d, J = 7.2
Hz, 2H), 7.49 (t, J = 7.3 Hz, 1H), 7.42 (t, J = 7.4 Hz, 2H), 4.34 – 4.26 (m, 1H), 1.27 (d, J = 6.6 Hz, 6H);
13C NMR (125 MHz, CDCl3) δ 166.8, 135.1, 131.4, 128.6, 126.9, 42.0, 23.0.
2-methylisoindolin-1-one (2ab):10
Yield= 68% (600 mg, 0.6 mmol scale); Rf = 0.18 (SiO2; hexanes: ethyl acetate; 2:1); Pale brown solid;
mp 106-108 °C; IR (neat, cm-1): 3053, 2953, 2918,1665, 1590, 1480,1396,1275, 1053; 1H NMR (500
MHz, CDCl3) δ 7.83 (d, J = 7.5 Hz, 1H), 7.52 (td, J = 7.4, 1.2 Hz, 1H), 7.46 – 7.41 (m, 2H), 4.37 (s,
2H), 3.20 (s, 3H); 13C NMR (125 MHz, CDCl3) δ 168.8, 141.1, 133.0, 131.3, 128.1, 123.7, 122.7, 52.1,
29.6.
methyl 2-(4-(1-oxoisoindolin-2-yl)phenyl)propanoate (2ac):12
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Yield 54% (40 mg); Rf = 0.16 (SiO2; hexanes: ethyl acetate; 2:1); Pale brown solid; mp 120-122 °C; IR
(neat, cm-1): 3039, 2978, 2950, 1730, 1683, 1608, 1513, 1467, 1442, 1245, 1015; 1H NMR (500 MHz,
CDCl3) δ 7.92 (dd, J = 7.5, 1.2 Hz, 1H), 7.83 (d, J = 8.7 Hz, 2H), 7.62 – 7.58 (m, 1H), 7.53 – 7.49 (m,
2H), 7.36 (d, J = 8.5 Hz, 2H), 4.85 (s, 2H), 3.74 (q, J = 7.2 Hz, 1H), 3.67 (s, 3H), 1.52 (d, J = 7.2 Hz,
3H); 13C NMR (125 MHz, CDCl3) δ 175.1, 167.6, 140.2, 138.6, 136.7, 133.2, 132.2, 128.5, 128.3,
124.3, 122.7, 119.8, 52.2, 50.8, 44.9, 18.6.
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2-phenethylisoindole (3i):
Yield 54% (30 mg); Rf = 0.9 (SiO2; hexanes: ethyl acetate; 5:1); Pale brown liquid; 1H NMR (500
MHz, CDCl3) δ 7.50 (dd, J = 6.4, 3.1 Hz, 2H), 7.32 – 7.22 (m, 3H), 7.12 – 7.07 (m, H), 7.04 (s, 2H),
6.91 (dd, J = 6.6, 3.0 Hz, 2H), 4.40 (t, J = 7.5 Hz, 2H), 3.19 (t, J = 7.4 Hz, 2H); 13C NMR (125 MHz,
CDCl3) δ 128.7, 128.7, 126.9, 124.4, 123.3, 120.7, 119.6, 110.6, 52.7, 38.7; GC/MS: tR= 7.89 min,
221.0 m/z
Note: This compound is highly sensitive to heat, light, and moisture. As such, other analytical data were
not presented due to inconsistent results.
2-((3s,5s,7s)-adamantan-1-yl)-2H-isoindole (3m):
Substrate 3m was obtained in first fraction during preparation of substrate 1m.
Yield 17% (75 mg); Pale pink solid; mp 170-172 °C; IR (neat, cm-1): 3058, 2915, 2848, 1627, 1585,
1458, 1347, 1154; 1H NMR (300 MHz, CDCl3) δ 7.54 (dd, J = 6.4, 3.0 Hz, 2H), 7.33 (s, 2H), 6.91 (dd,
J = 6.5, 2.9 Hz, 2H), 2.25 (m, 9H), 1.82 (m, 6H); 13C NMR (75 MHz, CDCl3) δ 123.5, 120.4, 119.7,
106.8, 44.4, 40.1, 36.3, 29.8; Anal. Calcd for C18H21N: C, 86.01; H, 8.42; N, 5.57. Found: C, 85.97; H,
8.38; N, 5.5
ASSOCIATED CONTENT
Supporting Information
NMR spectra of starting compounds and final products, details of the EPR sample preparation, detailed
screening of reaction conditions, GC-MS sample preparation, and deuterium KIE measurement. This
material is available free of charge via the Internet at http://pubs.acs.org.
AUTHOR INFORMATION
Corresponding Author
* Frank W. Foss Jr. ffoss@uta.edu
ACKNOWLEDGEMENT
Partial support for this work from the National Science Foundation, CHE-1303803 (ICC) and CHE-
0840509 (CRIF: MU), and from the University of Texas at Arlington is acknowledged. We thank Delphin
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Gout for performing X-ray crystallography experiments in UTA’s Shimadzu Center for Nanostructured
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