Stereodivergent α-Allylation of Linear Aldehydes with Dual Iridium and Amine Catalysis
作者:Simon Krautwald、Michael A. Schafroth、David Sarlah、Erick M. Carreira
DOI:10.1021/ja5003247
日期:2014.2.26
linear aldehydes. The reaction proceeds via direct iridium-catalyzed substitution of racemic allylic alcohols with enamines generated in situ. The use of an Ir(P,olefin) complex and a diarylsilyl prolinol ether as catalysts in the presence of dimethylhydrogen phosphate as the promoter proved to be crucial for achieving high enantio- and diastereoselectivity (>99% ee, up to >20:1 dr). The utility of the
我们描述了线性醛的完全立体发散的双催化 α-烯丙基化。该反应通过用原位生成的烯胺直接铱催化取代外消旋烯丙醇而进行。在磷酸二甲酯作为促进剂的情况下,使用 Ir(P,烯烃)配合物和二芳基甲硅烷基脯氨醇醚作为催化剂被证明对于实现高对映选择性和非对映选择性(>99% ee,高达 >20:1)至关重要博士)。该方法的实用性在抗抑郁药 (-)-帕罗西汀的简明对映选择性合成中得到了证明。