New Approach to Oximes through Reduction of Nitro Compounds Enabled by Visible Light Photoredox Catalysis
作者:Shunyou Cai、Shaolong Zhang、Yaohong Zhao、David Zhigang Wang
DOI:10.1021/ol4009443
日期:2013.6.7
A range of nitro compounds are smoothly reduced to their corresponding oximes under the synergistic effects of visiblelight irradiation, the Ru(bpy)3Cl2 photocatalyst, Hünig’s base, Mg(ClO4)2 activation, and MeCN solvent. This remarkably mild and environmentally benign protocol, when orchestrated with classical Beckmann rearrangement, enables such high-value industrial feedstock as caprolactam to
direct reductive N‐functionalization of aliphatic nitro compounds is presented. The nitro group is partially reduced to a nitrenoid, with a mild and readily available combination of B2pin2 and zinc organyls. Thereby, the formation of an unstable nitroso intermediate is avoided, which has so far severely limited reductive transformations of aliphatic nitro compounds. The reaction is concluded by an electrophilic
Sodium Borohydride Reduction of Nitrostyrenes by Reverse Addition: A Simple and Efficient Method for the Large-Scale Preparation of Phenylnitroethanes
作者:Anup Bhattacharjya、Ranjan Mukhopadhyay、Satyesh C. Pakrashi
DOI:10.1055/s-1985-31372
日期:——
Reverse addition of nitrostyrenes 1 to sodium borohydride in dioxan/ethanol gives phenylnitroethanes 3 in very good yields.
将硝基苯乙烯1与硼氢化钠在二氧六环/乙醇中进行逆加成反应,可高收率地得到苯基硝基乙烷3。
Reduction of conjugated nitroalkenes with zinc borohydride. A mild method for converting monosubstituted nitroalkenes to nitroalkanes and disubstituted ones to oximes
作者:Brindaban C. Ranu、Rupak Chakraborty
DOI:10.1016/s0040-4020(01)89028-1
日期:——
Mono-β-substituted conjugatednitroalkenes are readily reduced by zinc borohydride in 1,2-dimethoxyethane to the corresponding nitroalkanes, whereas the disubstituted ones furnish the corresponding oximes in excellent yields.
Highly selective reduction of conjugated nitroalkenes with zinc borohydride in DME
作者:Brindaban C. Ranu、Rupak Chakraborty
DOI:10.1016/0040-4039(91)80839-x
日期:1991.7
Zinc borohydride in 1,2-dimethoxvethane reduces α-substituted conjugated nitroalkenes to the corresponding oximes and non-α-substituted ones to the corresponding nitroalkanes in excellent yields.