A practical method for the synthesis of α-nitroamines by Michael addition of azide to nitroalkene has been developed. This reaction proceeds in high yields under very mild conditions (phase-transfer catalysis) and is found to be general; good yields are obtained with both aryl and alkyl derivatives as well as with 1,1-disubstituted ones. azides - amines - Michael addition - nitroalkenes - nitroamines
Asymmetric Neutral Amination of Nitroolefins Catalyzed by Chiral Bifunctional Ammonium Salts in Water-Rich Biphasic Solvent
作者:Lijia Wang、Seiji Shirakawa、Keiji Maruoka
DOI:10.1002/anie.201101307
日期:2011.5.27
It′s just a phase: Environmentally benign title reaction was achieved under neutral phase‐transfer conditions in the presence of 0.05 mol % of a chiral bifunctional ammonium bromide. The importance of bifunctional design of the chiral phase‐transfer catalysts (PTC) was clearly shown in the transition‐state model of the reaction based on the single‐crystal X‐ray structure. Bn=benzyl, Boc=tert‐butoxycarbonyl