A new electronically deficient atropisomeric diphosphine ligand (S)-CF3O-BiPhep and its application in asymmetric hydrogenation
作者:De-Yang Zhang、Chang-Bin Yu、Min-Can Wang、Kai Gao、Yong-Gui Zhou
DOI:10.1016/j.tetlet.2012.03.036
日期:2012.5
A new electronically deficient atropisomeric diphosphine ligand (S)-CF3O-BiPhep was synthesized from 1-bromo-3-(trifluoromethoxy)benzene in high yield. The key steps included oxidative coupling with anhydrous ferric chloride and optical resolution by (+)-DMTA. The ligand afforded high performance for Ir-catalyzed asymmetric hydrogenation of quinolines with ee up to 92% and TON up to 25,000. It was
以1-溴-3-(三氟甲氧基)苯为原料,高收率合成了一种新的电子缺陷的阻转异构二膦配体(S)-CF 3 O-BiPhep。关键步骤包括与无水氯化铁的氧化偶联和(+)-DMTA的光学拆分。该配体为ir高达92%的ee和TON高达25,000的Ir催化喹啉的不对称加氢提供了高性能。它也成功地应用于ee高达87%的Pd催化的简单吲哚的不对称加氢和ee高达97%的Rh催化的苯基硼酸向2-环己烯酮的不对称1,4-加成反应。