A Dual Lewis Base Activation Strategy for Enantioselective Carbene-Catalyzed Annulations
作者:Javier Izquierdo、Ane Orue、Karl A. Scheidt
DOI:10.1021/ja405833m
日期:2013.7.24
activation strategy integrating N-heterocyclic carbene (NHC) catalysis and a second Lewis base has been developed. NHC-bound homoenolate equivalents derived from α,β-unsaturated aldehydes combine with transient reactive o-quinone methides in an enantioselective formal [4 + 3] fashion to access 2-benzoxopinones. The overall approach provides a general blueprint for the integration of carbene catalysis with
开发了一种结合 N-杂环卡宾 (NHC) 催化和第二路易斯碱的双重活化策略。源自 α,β-不饱和醛的 NHC 结合高烯醇化物等价物与瞬时反应性邻醌甲基化物以对映选择性形式 [4 + 3] 方式结合,得到 2-苯并氧杂吡酮。总体方法为卡宾催化与额外的路易斯碱活化模式的整合提供了总体蓝图。