Aliphatic nitro groups are replaced by hydrogen on treatment with tributyltin hydride which proceeds via freeradical chain processes. As the nitro group is selectively denitrated and other reducible groups are not affected with tributyltin hydride, this reaction can be used as a method for removing the nitro group from polyfunctional compounds. The radical intermediates generated via denitration can
Conjugate addition of alkyl groups to α,β-unsaturated sulfoxides via Michael addition of nitroparaffins and subsequent denitration with tributyltin hydride
Michael addition of nitroparaffins to α,β-unsaturated sulfoxides is well effected in the presence of DBU. The nitro group in the adduct is replaced by hydrogen with Bu3SnH without influence to the sulfinyl function. The overall reations provide an efficient method for the conjugateaddition of alkyl groups to α,β-unsaturated sulfoxides.
Ono, Noboru; Hamamoto, Isami; Kaji, Aritsune, Journal of the Chemical Society. Chemical communications, 1982, # 15, p. 821 - 822
作者:Ono, Noboru、Hamamoto, Isami、Kaji, Aritsune
DOI:——
日期:——
Asymmetric reduction of nitroalkenes with baker's yeast
作者:Yasushi Kawai、Yoshikazu Inaba、Norihiro Tokitoh
DOI:10.1016/s0957-4166(01)00029-5
日期:2001.2
Various alpha,beta -disubstituted and trisubstituted nitroalkenes were chemoselectively reduced with baker's yeast to the corresponding nitroalkanes. Stereoselectivities of the reduction of alpha,beta -disubstituted nitroalkenes were modest to low, and e.e.s up to 52% were obtained. Trisubstituted nitroalkenes could be reduced to the corresponding nitroalkanes with excellent enantioselectivities, moderate diastereoselectivities and in good yield. (C) 2001 Elsevier Science Ltd. All rights reserved.