Enantioselective organocatalytic substitution of α-cyanoacetates on imidoyl chlorides – synthesis of optically active ketimines
作者:Stefano Santoro、Thomas B. Poulsen、Karl Anker Jørgensen
DOI:10.1039/b715810f
日期:——
The enantioselective substitution of α-cyanoacetates on imidoyl chlorides under phase-transfer catalytic conditions is presented; a simple quinidine-derived phase-transfer catalyst gives access to the products, highly substituted ketimines, in generally good yields and up to 90% ee.
Kinetic and Dynamic Kinetic Resolution of Racemic Tertiary Bromides by Pentanidium‐Catalyzed Phase‐Transfer Azidation
作者:Jingyun Ren、Xu Ban、Xin Zhang、Siu Min Tan、Richmond Lee、Choon‐Hong Tan
DOI:10.1002/anie.202000138
日期:2020.6.2
azides and bromides through pentanidium-catalyzed kinetic resolution (KR) of racemic tertiary bromides under base-free conditions. We found that the absence of water is crucial to attain a high selectivity factor (s). On the other hand, new experimental observations and DFT modeling led us to propose that enantioconvergent azidation of tertiary bromides proceeded through dynamic kinetic resolution