Catalytic, Enantioselective Alkylation of α-Imino Esters: The Synthesis of Nonnatural α-Amino Acid Derivatives
作者:Dana Ferraris、Brandon Young、Christopher Cox、Travis Dudding、William J. Drury、Lev Ryzhkov、Andrew E. Taggi、Thomas Lectka
DOI:10.1021/ja016838j
日期:2002.1.1
Methodology for the practical synthesis of nonnatural amino acids has been developed through the catalytic, asymmetric alkylation of α-imino esters and N,O-acetals by enol silanes, ketene acetals, alkenes, and allylsilanes using chiral transition metal-phosphine complexes as catalysts (1−5 mol %). The alkylation products, which are prepared with high enantioselectivity (up to 99% ee) and diastereoselectivity
使用手性过渡金属-膦配合物作为催化剂,通过烯醇硅烷、乙烯酮缩醛、烯烃和烯丙基硅烷对 α-亚氨基酯和 N,O-缩醛进行催化不对称烷基化,开发了用于实际合成非天然氨基酸的方法。 1-5 摩尔%)。以高对映选择性(高达 99% ee)和非对映选择性(高达 25:1/anti:syn)制备的烷基化产物是受保护的非天然氨基酸,代表天然产物和药物的潜在前体。烯烃与α-亚氨基酯催化反应的动力学分析被提出以阐明该反应的机理。