Assisted Tandem Catalysis: Metathesis Followed by Asymmetric Hydrogenation from a Single Ruthenium Source
作者:Marc Renom-Carrasco、Piotr Gajewski、Luca Pignataro、Johannes G. de Vries、Umberto Piarulli、Cesare Gennari、Laurent Lefort
DOI:10.1002/adsc.201500359
日期:2015.7.6
Here we report the first example of a tandem metathesis–asymmetric hydrogenation protocol where the prochiral olefin generated by metathesis is hydrogenated with high enantioselectivity by an in situ formed chiral ruthenium catalyst. We show that either the ruthenium metathesis catalysts or the ruthenium species formed during the metathesis reaction can be converted into an efficient asymmetric hydrogenation
在这里,我们报道了串联复分解-不对称氢化方案的第一个例子,其中由复分解生成的前手性烯烃通过原位形成的手性钌催化剂以高对映选择性进行氢化。我们表明,在添加手性配体和醇后,钌复分解催化剂或在复分解反应过程中形成的钌物种都可以转化为有效的不对称氢化催化剂。不对称氢化的性能似乎非常依赖于溶剂,手性配体和前手性底物。