The chiral M-CsDPEN [M = Ru, Rh, Ir; CsDPEN = (R,R,R)- or (S,S,S)-N-camphorsulfonyl-1,2-diphenylethylenediamine] catalysts have been shown to be efficient for the asymmetric transfer hydrogenation (ATH) of aryl ketones by formate in neat water. Of particular note is the Ir-(R,R,R)-CsDPEN catalyst, which catalyzes the ATH of a wide range of ketones and delivers almost full conversions within a few hours at a S/C ratio of 1000 at 40 °C in most cases, with enantioselectivities up to 98% ee.
手性M-CsDPEN [M = Ru, Rh, Ir; CsDPEN = (R,R,R)- 或 (S,S,S)-N-
樟脑磺酰-1,2-二苯基
乙二胺]催化剂已被证明是在纯
水条件下用
甲酸进行
芳香酮不对称转移氢化的有效催化剂。特别值得关注的是Ir-(R,R,R)-CsDPEN催化剂,它在大多数情况下,在40°C下以1000的S/C比率催化广泛范围的酮的不对称转移氢化反应,在几个小时内几乎实现完全转化,并且最高可达98%的ee值的手性选择性。