Cascade Michael−Aldol Reactions Promoted by Hydrogen Bonding Mediated Catalysis
作者:Liansuo Zu、Jian Wang、Hao Li、Hexin Xie、Wei Jiang、Wei Wang
DOI:10.1021/ja067781+
日期:2007.2.1
diastereoselective tandem Michael−aldol reactions, efficiently catalyzed by a cinchona alkaloid thiourea via synergistic noncovalent hydrogen-bonding activation of both the Michael donor and acceptor, have been developed. The process affords a powerful means for the construction of versatile chiral thiochromanes with the formation of three stereogenic centers in a one-potsynthesis from simple achiral