Brønsted Acid-Catalyzed, Enantioselective, Vinylogous Mannich Reaction of Vinylketene Silyl <i>N</i>,<i>O</i>-Acetals
作者:David S. Giera、Marcel Sickert、Christoph Schneider
DOI:10.1021/ol8017374
日期:2008.10.2
Vinylketene silyl N,O-acetals undergo chiral phosphoric acid-catalyzed, vinylogous Mukaiyama-Mannich reactions with imines and afford delta-amino-alpha,beta-unsaturated amides in typically good yields, complete gamma-regioselectivity, and up to 92% ee with catalyst loadings of as low as 1 mol %. The Mannich products can be readily manipulated to furnish valuable synthetic intermediates.