Catalytic enantioselective cyanosilylation of ketones: improvement of enantioselectivity and catalyst turn-over by ligand tuning
作者:Yoshitaka Hamashima、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1016/s0040-4039(00)02039-6
日期:2001.1
the bifunctional catalyst 1 afforded the improved catalyst 2, which promoted the cyanosilylation of ketones with higher enantioselectivity as well as with improved catalyst turn-over with a factor of up to 10. Thus, chiral quaternary α-hydroxynitriles were obtained with excellent ee (up to 94% ee) using 1 mol% of 2 in the case of aryl ketones and 2.5 mol% of 2 in the case of aliphatic ketones.
对双官能催化剂1进行立体和电子调谐,得到了改进的催化剂2,该催化剂以较高的对映选择性和最大为10的改进的催化剂周转率促进了酮的氰基甲硅烷基化反应。在芳基酮的情况下使用1 mol%的2和在脂族酮的情况下使用2.5 mol%的2时,具有优异的ee(最高94%ee)。