Design, synthesis, and optical resolution of a novel non-natural chiral auxiliary, 1-(2,5-dimethoxyphenyl)ethylamine. Application to diastereoselective alkylation of aldimines
作者:Takehiro Kohara、Yukihiko Hashimoto、Kazuhiko Saigo
DOI:10.1016/s0040-4020(99)00307-5
日期:1999.5
A chiral amine, 1-(2,5-dimethoxyphenyl)ethylamine, was found to be an effective chiral auxiliary for the diastereoselective alkylation of its aldimines with alkylmetals. The 1-(2,5-dimethoxyphenyl)ethyl group of the chiral auxiliary could be removed by the acetylation and then oxidation of the resultant alkylated product, accompanying an amino-transfer from the chiral auxiliary to the final product
发现手性胺1-(2,5-二甲氧基苯基)乙胺是其醛亚胺与烷基金属的非对映选择性烷基化的有效手性助剂。手性助剂的1-(2,5-二甲氧基苯基)乙基可以通过乙酰化然后氧化得到的烷基化产物而除去,伴随着从手性助剂到最终产物的氨基转移。外消旋的1-(2,5-二甲氧基苯基)乙胺可以很容易地由1,4-二甲氧基苯合成,并通过与扁桃酸形成非对映异构体盐而拆分,从而得到两种对映体纯形式。