作者:Laëtitia Palais、Alexandre Alexakis
DOI:10.1002/chem.200901577
日期:2009.10.12
they can be highly functionalised. Herein we report the copper‐catalysed asymmetric conjugate addition of diethyl zinc and trialkylaluminium reagents with SimplePhos ligands, which gives high enantioselectivity with cyclic enones, acyclic enones and nitro‐olefins, with up to 98.6 % ee. Of particular interest is the reaction of trialkylaluminium reagents with a wide range of 3‐substituted enones, thus
SimplePhos配体基于磷原子上的手性胺部分和柔性二芳基,代表一类新型的单齿手性配体。它们可以通过两种不同的途径轻松制备,并且可以高度功能化。在本文中,我们报告了具有SimplePhos配体的铜催化的二乙基锌和三烷基铝试剂的铜催化不对称共轭加成反应,它与环烯酮,无环烯酮和硝基烯烃的对映选择性很高,ee高达98.6% 。特别令人感兴趣的是三烷基铝试剂与各种3-取代的烯酮的反应,从而可以形成立体异构的季碳中心。