Metallophosphite-Catalyzed Asymmetric Acylation of α,β-Unsaturated Amides
作者:Mary R. Nahm、Justin R. Potnick、Peter S. White、Jeffrey S. Johnson
DOI:10.1021/ja056018x
日期:2006.3.1
The l-menthone-derived TADDOL phosphite 6b catalyzes highly enantioselective conjugate additions of acyl silanes to α,β-unsaturated amides. p-Methoxybenzoyl cyclohexyldimethylsilane adds to a variety of N,N-dimethyl acrylamide derivatives in the presence of the lithium salt of 6b. In many instances the α-silyl-γ-ketoamide product undergoes facile enantioenrichment (to 97−99% ee) upon recrystallization