Synthesis of chiral β-amino acid derivatives by asymmetric hydrosilylation with an imidazole derived organocatalyst
作者:Simon Jones、Xianfu Li
DOI:10.1016/j.tet.2012.04.084
日期:2012.7
hydrosilylation of a number of N-aryl and alkyl β-substituted enamino esters proceeds in generally good yield and enantioselectivity. Crucial to obtaining high yield and selectivity was the addition of benzoic acid as an additive and under these conditions, both N-alkyl and N-aryl substituents were well tolerated. β-Aryl and alkyl substituents were evaluated and a model proposed to account for the experimental
许多N-芳基和烷基β-取代的烯氨基酯的有机催化的不对称氢化硅烷化通常以良好的收率和对映选择性进行。获得高产率和选择性的关键是加入苯甲酸作为添加剂,在这些条件下,N-烷基和N-芳基取代基均具有良好的耐受性。评估了β-芳基和烷基取代基,并提出了一个模型,以基于烯胺互变异构和反应性酮亚胺中间体的构象偏爱来解释实验结果。