Electrooxidative coupling of salts of nitro compounds with halide, nitrite, cyanide, and phenylsulfinate anions
作者:A. I. Ilovaisky、V. M. Merkulova、Yu. N. Ogibin、G. I. Nikishin
DOI:10.1007/s11172-006-0007-7
日期:2005.7
salts of primary and secondary nitrocompounds (nitroethane, 1- and 2-nitropropanes, nitrocyclohexane, and nitrocycloheptane) in the presence of excess halide, nitrite, cyanide, and phenylsulfinate anions under undivided and divided amperostatic electrolysis conditions in a two-phase medium (CH2Cl2/H2O) produces geminal nitrohalides (35–85% yields), dinitro compounds (15–51%), nitronitriles (6–27%)
Sodiumethanethiolate in methanol is an efficient reducing agent for gem-bromonitro compounds; treatment of the resultant nitronates with a protic acid or with N-chlorosucccinimide gives high yields of the corresponding nitro or gem-chloronitro compounds, respectively.
Various β-nitro ketones, including those bearing a β-tertiary carbon, were prepared from geminal bromonitroalkanes and trimethylsilyl enol ethers of a broad range of ketones by visiblelightphotoredoxcatalysis, which were then easily converted into β-amino ketones, 1,3-amino alcohols, α,β-unsaturated ketones, β-cyano ketones and γ-nitro ketones.