Catalytic Asymmetric Aza-Morita−Baylis−Hillman Reaction of Methyl Acrylate: Role of a Bifunctional La(O-<i>i</i>Pr)<sub>3</sub>/Linked-BINOL Complex
作者:Takafumi Yukawa、Bianca Seelig、Yingjie Xu、Hiroyuki Morimoto、Shigeki Matsunaga、Albrecht Berkessel、Masakatsu Shibasaki
DOI:10.1021/ja103294a
日期:2010.9.1
The catalytic asymmetric aza-Morita-Baylis-Hillman reaction using unactivated methyl acrylate is described. A simple Lewis acidic metal catalyst, such as La(OTf)(3), was not suitable for the reaction, but rare earth metal alkoxide/linked-BINOL complexes possessing bifunctional Lewis acid and Brønsted base properties efficiently promoted the reaction in combination with an achiral nucleophilic organocatalyst
描述了使用未活化丙烯酸甲酯的催化不对称 aza-Morita-Baylis-Hillman 反应。简单的路易斯酸性金属催化剂,如 La(OTf)(3),不适合该反应,但具有双功能路易斯酸和布朗斯台德碱性质的稀土金属醇盐/连接的 BINOL 配合物有效地促进了反应与非手性亲核有机催化剂。La(O-iPr)(3)/(S,S)-TMS-linked-BINOL 复合物与催化量的 DABCO 的组合使用促进了广泛的 N-的 aza-Morita-Baylis-Hillman 反应。二苯基膦酰基亚胺。以67-99%的产率和81-95%的ee获得来自芳基、杂芳基和烯基亚胺的产物。值得注意的是,也可以使用可异构化的烷基亚胺,得到产率为 78-89% 和 ee 为 94-98% 的产物。