Asymmetric Synthesis of Functionalized Tetrasubstituted α-Aminophosphonates through Enantioselective Aza-Henry Reaction of Phosphorylated Ketimines
作者:Javier Vicario、Pablo Ortiz、José M. Ezpeleta、Francisco Palacios
DOI:10.1021/jo502233m
日期:2015.1.2
Bifunctional Cinchona alkaloid thioureas efficiently catalyze asymmetric nucleophilic addition of nitromethane to ketimines derived from alpha-aminophosphonic acids to afford tetrasubstituted alpha-amino-beta-nitro-phosphonates. Catalytic hydrogenation of (S)-alpha-amino-beta-nitro-phosphonate 2d gives enantiopure (S)-alpha,beta-diaminophosphonate 3.