enantiomerically pure binaphthanol. This ligand possesses both binaphthyl chirality and phospholane functionality. Excellent enantioselectivities (95-99.6% ee) have been observed in hydrogenation of an isomeric mixture of (E)- and (Z)-beta-substituted-alpha-arylenamides by using a Rh-binaphane catalyst. These enantioselectivities are the highest reported to date for this transformation.
[式:见正文]一种新的手性膦,(R,R)-1,2-双[(R)-4,5-二氢-3H-二
萘并[2,1- c:1',2'-e根据实际路线,从容易获得的对映体纯的联
萘酚制备[膦]苯] [缩写为(R,R)-联
萘芬]。该
配体同时具有联
萘基手性和膦酰基官能团。在通过使用Rh-
联苯甲酰胺催化剂的(E)-和(Z)-β-取代的α-芳基酰胺的异构体混合物的氢化中,观察到了极好的对映选择性(95-99.6%ee)。这些对映选择性是迄今为止报道的最高转化率。