Efficient, enantioselective synthesis of a β,β-disubstituted carboxylic acid by Ru-XylPhanePhos-catalyzed asymmetric hydrogenation
作者:Gabriela A. Grasa、Antonio Zanotti-Gerosa、Shyamali Ghosh、Christopher A. Teleha、William A. Kinney、Bruce E. Maryanoff
DOI:10.1016/j.tetlet.2008.06.068
日期:2008.9
integrin antagonist intermediate was accomplished via catalytic asymmetric hydrogenation of the corresponding β,β-disubstituted α,β-unsaturated carboxylic acid bearing a 3-quinolinyl moiety. The successful application of a Ru-(R)-XylPhanePhos catalyst to this type of substrate is unprecedented. In situ NMR experiments of pre-catalyst formation/activation by CH3CO2H, and reaction parameter modification,
一个关键的α对映选择性制备v β 3整联蛋白拮抗剂的中间体通过相应的β的催化不对称氢化,β二取代的α,β不饱和羧酸轴承3-喹啉基部分来实现。Ru- (R)-XylPhanePhos催化剂在此类基材上的成功应用是前所未有的。CH 3 CO 2 H催化前催化剂形成/活化及反应参数修饰的原位NMR实验表明,[Ru(COD)(CF 3 CO 2)2 ] 2 /(R)-XylPhanePhos具有很高的活性,且高效的催化系统。