Denmark’s chiral bisphosphoramide/silicon tetrachloride system performs as an excellent Lewis base-Lewis acid catalyst for the vinylogous Mukaiyama aldol reaction of pyrrole- and furan-based dienoxy silanes with aromatic and heteroaromatic aldehydes. This asymmetric methodology provides a powerful synthetic entry to a variety of δ-hydroxylated γ-butenolide-type frameworks with high efficiency and valuable
Asymmetric Vinylogous Aldol Reaction of Silyloxy Furans with a Chiral Organic Salt
作者:Ravi P. Singh、Bruce M. Foxman、Li Deng
DOI:10.1021/ja103331t
日期:2010.7.21
significance there is a general lack of asymmetric vinylogous aldolreactions that tolerate variations of both the silyloxy furans and aldehydes. We have developed a newchiral organic catalyst based on a carboxylate-ammonium salt preparedfrom a thiourea-amine and a carboxylic acid. This newcatalyst enabled us to develop an efficient asymmetric vinylogous aldolreaction of unprecedented scope with respect