Asymmetric α-Alkylation of α-Amino Esters Using Pyridoxal Derivatives Having a Chiral Ansa-Structure and a Chiral Ionophore Function: a Novel Example of Double Asymmetric Induction
作者:Kazuyuki Miyashita、Hideto Miyabe、Kuninori Tai、Hiroshi Iwaki、Takeshi Imanishi
DOI:10.1016/s0040-4020(00)00392-6
日期:2000.6
Stereoselective alkylation of aldimines, prepared from α-amino esters and a pyridoxal model having a chiral ansa-structure and an ethoxyethoxy group at C-3, proceeded in the presence of Li+ to give α,α-dialkyl amino esters after acidic hydrolysis. Double asymmetric induction effect was also observed in the alkylation reaction by combination of the chiral ansa-structure and a chiral ionophore side chain
由α-氨基酯和在C-3上具有手性ansa结构和乙氧基乙氧基的吡ido醛模型制备的醛亚胺的立体选择性烷基化在Li +存在下进行,在酸性水解后得到α,α-二烷基氨基酯。通过手性ansa结构和C-3处的手性离子载体侧链的组合,在烷基化反应中还观察到双重不对称诱导作用。