the workup. Amino alcohol 2b, that gave the best enantioselectivities in the stoichiometric reaction, was also applied in a catalytic process, and ee's up to 85% were achieved using 0.25 equiv of the ligand, which is the highest ee obtained so far using that catalytic amount of the ligand. Addition products 3 could be converted into the free amines 4 without racemization by acidic hydrolysis. The utility
已经制备了一组具有2-
氮杂
降冰片烯骨架的新的β-
氨基醇2,并评估了其作为促进二烷基
锌试剂向N-(
二苯基膦酰基)
亚胺1的对映选择性加成的
促进剂。 ee最高可达92%。尽管使用了
化学计量的
配体,但在后处理期间可以回收约90%的
配体。在
化学计量反应中具有最佳对映选择性的
氨基醇2b也用于催化过程,使用0.25当量的
配体可达到ee的85%,这是迄今为止使用该催化量的ee获得的最高ee。
配体。加成产物3可以不通过酸
水解外消旋地转化为游离胺4。