作者:Sobia Tabassum、Oksana Sereda、Peddiahgari Vasu Govardhana Reddy、René Wilhelm
DOI:10.1039/b908899g
日期:——
KHMDS and KOtBu are well established as strong, hindered, non-nucleophilic Brønsted bases. However, in the present work these bases are applied as highly active Lewis base catalysts for the formal [2+2] cycloaddition of ketenes with aldehydes and imines.
Enantiopure imidazolinium-dithiocarboxylates as highly selective novel organocatalysts
作者:Oksana Sereda、Amélie Blanrue、René Wilhelm
DOI:10.1039/b817991c
日期:——
Asymmetric imidazolinium-dithiocarboxylates have been found for the first time to be highly selective catalysts; in the present case, the novel organocatalysts were able to catalyze the Staudinger reaction in up to 96% ee and 99% yield.
首次发现不对称咪唑啉鎓-二硫代羧酸盐是高选择性催化剂;在本例中,新型有机催化剂能够以高达 96% ee 和 99% 的产率催化施陶丁格反应。