Regio- and Enantioselective Synthesis of Pyrrolidines Bearing a Quaternary Center by Palladium-Catalyzed Asymmetric [3 + 2] Cycloaddition of Trimethylenemethanes
作者:Barry M. Trost、Tom M. Lam、Melissa A. Herbage
DOI:10.1021/ja312351s
日期:2013.2.20
Herein we describe the first use of disubstituted donors in the palladium-catalyzed trimethylenemethane (TMM) cycloaddition resulting in an enantioselective synthesis of highly substituted pyrrolidines. These cyanoalkyl donors 1 form all-carbon quaternary centers in a catalytic, asymmetric, and intermolecular manner uniquely using diamidophosphite ligands L2 and L3, generating synthetically important
在本文中,我们描述了在钯催化的三亚甲基甲烷 (TMM) 环加成反应中首次使用双取代供体,导致对映选择性合成高度取代的吡咯烷。这些氰基烷基供体 1 以催化、不对称和分子间的独特方式使用二酰胺基亚磷酸酯配体 L2 和 L3 形成全碳季铵中心,以良好的产率和选择性生成合成上重要的手性结构单元。