Asymmetric Hydrogenation of 2,4-Disubstituted 1,5-Benzodiazepines Using Cationic Ruthenium Diamine Catalysts: An Unusual Achiral Counteranion Induced Reversal of Enantioselectivity
作者:Zi-Yuan Ding、Fei Chen、Jie Qin、Yan-Mei He、Qing-Hua Fan
DOI:10.1002/anie.201200309
日期:2012.6.4
highly enantioselective hydrogenation of 2,4‐disubstituted 1,5‐benzodiazepines using chiral cationic ruthenium diamine catalysts (R,R)‐1 has been developed (see scheme; BArF=tetrakis(3,5‐bistrifluoromethylphenyl)borate). Either enantiomer of 2,4‐diaryl‐2,3,4,5‐tetrahydro‐1H‐benzodiazepine derivatives could be obtained by using the same enantiomer of ligand but in the presence of a different achiral counteranion
用另一种方法解决这个问题:已开发出使用手性阳离子钌二胺催化剂(R,R)-1对2,4-二取代的1,5-苯并二氮杂进行高度对映选择性加氢反应(参见方案; BArF = tetrakis(3,5-双三氟甲基苯基)硼酸酯)。2,4-二芳基-2,3,4,5-四氢-1 H-苯并二氮杂derivatives的对映异构体可以通过使用相同的配体对映异构体但存在不同的非手性抗衡阴离子来获得。