A novel oxidative reaction of 2-nitro-1-phenylpropane with sodium nitrite. A new approach to prepare 1-oximino-1-phenylacetones

Article abstract of DOI:10.1016/j.tetlet.2003.09.054

A useful method for preparation of 1-oximino-1-phenylacetones via a novel oxidative reaction of 2-nitro-1-phenylpropanes with sodium nitrite was reported.

Full text of DOI:10.1016/j.tetlet.2003.09.054

TETRAHEDRON
LETTERS
Pergamon
Tetrahedron Letters 44 (2003) 8061–8062
A novel oxidative reaction of 2-nitro-1-phenylpropane with
sodium nitrite. A new approach to prepare
1-oximino-1-phenylacetones
Chongzhao Ran,a,* Genjin Yang,b Taizhi Wua and Meihua Xiea
aShanghai Institute of Pharmaceutical Industry, Shanghai 200437, PR China
bPharmacy School, Second Military Medical University, Shanghai 200433, PR China
Received 17 August 2003; revised 8 September 2003; accepted 8 September 2003
Abstract—A useful method for preparation of 1-oximino-1-phenylacetones via a novel oxidative reaction of 2-nitro-1-phenyl-
propanes with sodium nitrite was reported.
© 2003 Elsevier Ltd. All rights reserved.
Aliphatic nitro compounds are important intermediates
for organic synthesis.1 However, the transformations of
aliphatic nitro compounds to other functionalities are
very limited. The conversions to aldehydes or ketones
by the Nef reaction2 and the reduction to amines3 are
the most common transformation of nitroalkanes.
Although there are some reports concerned about the
oxidation of primary nitro compounds,4 to our knowl-
edge, there is no corresponding report about the oxida-
tion of the secondary nitro compounds except the Nef
reaction. Here we would like to report for the first time
that the secondary nitro compounds such as 2-nitro-
phenylpropanes could be oxidized into a-oximinoke-
tones with sodium nitrite under very mild conditions.
Matt et al. reported that primary nitro compounds
reacted with sodium nitrite and acetic acid in DMSO to
give the corresponding carboxylic acid (Scheme 1).4a
When secondary nitro compound 2-nitro-1-(4-
methoxylphenyl) propane was treated with sodium
nitrite under the conditions Matt reported,4a unexpect-
edly and interestingly, we found the product was nei-
ther the corresponding carboxylic acid which may arise
from the mechanism Matt proposed4a or the corre-
sponding ketone compound which may arise from the
Nef reaction.
1
According to the spectrum of H NMR and 13C NMR,
Mass spectrum, IR, the product might be 1 or 2
Scheme 1.
(Scheme 2), which were known compounds.5 Compar-
Scheme 2.
Keywords: 2-nitro-1-phenylpropanes; nitrite; oxidation; 1-oximino-1-phenylacetones.
* Corresponding author. Present address: Ben May Institute for Cancer Research, University of Chicago, IL 60637, USA. Tel.: +1-773-702-6791;
fax: +1-773-702-6260; e-mail: cran@uchicago.edu
0040-4039/$ - see front matter © 2003 Elsevier Ltd. All rights reserved.
doi:10.1016/j.tetlet.2003.09.054

8062
C. Ran et al. / Tetrahedron Letters 44 (2003) 8061–8062
Scheme 3.
Table 1. The yields of 1-oximino-1-phenylacetones from
Groups, Methods of Formation of Nitro Group in
Aliphatic and Alicyclic Systems; Pata¨ı, S., Ed.; Inter-
science Publishers: New York, 1969; Part 1, pp. 301–348.
2. (a) Nef, J. V. Ann. Chem. 1899, 308, 264–333; (b) Korn-
blum, N.; Brown, R. A. J. Am. Chem. Soc. 1965, 87,
1742–1747; (c) Review of the Nef reaction, see: Pinnick,
H. W. Org. React. 1990, 38, 655–792.
3. (a) Ran, C.; Wu, T. Chin. Chem. Lett. 2000, 11, 855–
856; (b) Stilles, M.; Finkbeiner, H. L. J. Am. Chem. Soc.
1959, 81, 505–506; (c) Corey, E. J.; Andersen, N. H.;
Carlson, R. M.; Paust, J.; Vedejs, E.; Vlattas, I.; Winter,
R. E. K. J. Am. Chem. Soc. 1968, 90, 3245–3247.
4. (a) Matt, C.; Mioskowski, C. J. Org. Chem. 1997, 62,
234–235; (b) Cundall, R. B.; Locke, A. W. J. Chem.
Soc. B 1968, 98–103; (c) Galobardes, M. R.; Pinnick, H.
W. Tetrahedron Lett. 1981, 22, 5235–5338; (d) Saville-
Stones, E. A.; Lindell, S. D. Synlett 1991, 591–592.
5. Fitton, A.; Muzanila, C. N.; Odusanya, O. M. J. Chem.
Res. Miniprint 1988, 11, 2701–2719.
2-nitro-1-phenylpropanes
Entries
R
Products
Yield (%)*
3a
3b
3c
3d
p-OCH3
3,4-OCH2O-
p-Cl
1a
1b
1c
1d
74
85
82
85
p-NO2
* The yield was not optimized.
1
ing the H NMR data of the product with literatures,5
we confirmed the product structure was 1. To further
verify the configuration of this compound, we treated
this compound with irradiation in chloroform, the con-
version of E-isomer to Z-isomer was observed,8 which
was in agreement with the reported literature.6 There-
fore, we confirmed that the product was E-isomer
(Scheme 2). NOE experiment results also supported this
conclusion.
6. Bass, P.; Cerfontain, H. J. Chem. Soc., Perkin 2 1979,
156–162.
7. Naphthol-Chemie Offenbach; 1950, DE 869205.
8. General procedure for 1a–1d from 3a–3d (1a from 3a):
acetic acid was added to a solution of 3a (0.56 g, 2.88
mmol) and NaNO2 (0.20 g, 2.89 mmol) in DMSO solu-
tion (2.5 ml) under stirring. This resulting mixture was
stirred for 1.5 h at 35°C, cooled to room temperature,
poured into ice-water 100 ml with vigorous stirring, a
white precipitate was formed, which was collected by
filtration to afford 1a (0.42 g, 74.0%): m/z (LR-EI) 193;
mp: 150–152°C,5 1H NMR l (DMSO, ppm) 12.40 (s,
1H, -OH), 7.24 (dd, J1=2.7, J2=11.6, 1H, Ar-H), 7.24
(d, J=4.8, 1H, Ar-H), 6.94 (dd, J1=2.7, J2=11.8, 1H,
Ar-H), 6.94 (d, J=4.8, 1H, Ar-H), 3.77 (s, 3H, -OCH3),
2.43 (s, 3H, CH3). After irradiation under 254 nm for 48
h, 1H NMR l (DMSO, ppm) 12.45 (s, 0.82H, -OH),
11.60 (s, 0.18H, -OH), 7.36 (d, J=9.0, 0.36H, Ar-H),
7.19 (d, J=9.0, 1.54H, Ar-H), 6.95 (d, J=9.0, 0.36H,
Ar-H), 6.92 (d, J=9.0, 1.54H, Ar-H), 3.83 (s, 1.08H),
3.74 (s, 1.92H), 2.39 (s, 1.08H), 2.38 (s, 1.92H); 13C
NMR l (DMSO, ppm) 196.8 (-CꢀO), 159.6 (CꢀN),
154.9, 131.2, 121.5, 113.1 (Ar-C), 55.3 (OCH3), 26.3
(CH3); IR (KBr, g cm−1): 2500–3500 (br, -OH), 1710 (s,
-CꢀO), 1620 (m, -CꢀN).
Meanwhile, a by-product, p-methoxylbenzonitrile, was
separated from the filtrate. It may arise from Beckmann
rearrangement of Z-isomer.7
Other secondary nitro compounds were also tested
under this condition,8 the results were listed in Table 1
(Scheme 3).
In conclusion, we have described one novel and conve-
nient method to prepare 1-oximino-1-phenylacetones
from 2-nitro-1-phenylpropanes.
Acknowledgements
Financial supports from the New Drug Foundation of
Shanghai Institute of Pharmaceutical Industry are
gratefully acknowledged.
References
1. Larson, J. H. The Chemistry of Nitro and Nitroso