N-Benzyl-norephedrine derivatives as new, efficient ligands for ruthenium-catalyzed asymmetric transfer hydrogenation of functionalized ketones
作者:Kathelyne Everaere、Jean-François Carpentier、André Mortreux、Michel Bulliard
DOI:10.1016/s0957-4166(99)00465-6
日期:1999.10
activities (up to 600 h−1 at 20°C) and enantiomeric excesses ranging from 56 to 89% for the asymmetric transfer hydrogenation of β-ketoesters, methoxyacetone and 2-acetylpyridine to the corresponding alcohols are achieved in the presence of catalytic combinations of [RuCl2(η6-arene)]2 and N-substituted derivatives of (1S,2R)-norephedrine such as N-benzyl-norephedrine and N-(4-biphenyl)methyl-norephedrine.
在催化作用下,β-酮酸酯,甲氧基丙酮和2-乙酰基吡啶不对称转移氢化为相应的醇,具有显着的催化活性(在20°C时可达600h -1)和对映体过量为56%至89%的组合将[RuCl 2(η 6 -arene)] 2和ñ取代的衍生物(1小号,2 - [R )-降麻黄碱如ñ -苄基去甲麻黄碱和ñ - (4-联苯基)甲基-降麻黄碱。