Orthopalladated complexes as phase-transfer catalysts for asymmetric alkylation of achiral Schiff base esters
作者:Dae Hyun Kim、Jin Kyu Im、Dae Won Kim、Hyunjoo Lee、Honggan Kim、Hoon Sik Kim、Minserk Cheong、Deb Kumar Mukherjee
DOI:10.1007/s11243-010-9416-4
日期:2010.11
benzophenone Schiff base glycine esters has been achieved using a palladium(II) chiral complex as a phase-transfer catalyst. The aromatic moiety around the metal center and various physicochemical parameters were investigated to study their effect on the asymmetric alkylation reaction under phase-transfer conditions. Moderate enantioselectivity(30–40%) was achieved under roomtemperature conditions, which is a
二苯甲酮席夫碱甘氨酸酯的不对称 C-烷基化已使用钯 (II) 手性配合物作为相转移催化剂实现。研究了金属中心周围的芳香部分和各种物理化学参数,以研究它们在相转移条件下对不对称烷基化反应的影响。在室温条件下实现了中等对映选择性(30-40%),与早先报道的手性钯-salen 络合物没有对映选择性相比,这是一个显着的改进。计算机模拟研究表明,金属中心与 Z-烯醇化物的配位形成方形平面复合物提供了有利的空间环境,其中烯醇化物的 α-碳原子可用于对映选择性烷基化。