Easy Routes towards Chiral Lithium Binaphthylamido Catalysts for the Asymmetric Hydroamination of Amino-1,3-dienes and Aminoalkenes
作者:Julia Deschamp、Jacqueline Collin、Jérôme Hannedouche、Emmanuelle Schulz
DOI:10.1002/ejoc.201001596
日期:2011.6
The preparation of chiral lithium salts of N,N′-disubstituted binaphthyldiamines and their use as catalysts for asymmetric hydroamination/cyclisation of amino-1,3-dienes and aminoalkenes are reported. Several straightforward methods involving the combination of ligand with solutions of methyl- or [(trimethylsilyl)methyl]lithium (LiCH2TMS) by ex situ or in situ preparation have been investigated. The
报道了 N,N'-二取代联萘二胺的手性锂盐的制备及其作为氨基-1,3-二烯和氨基烯烃的不对称加氢胺化/环化催化剂的用途。已经研究了几种直接的方法,包括通过异位或原位制备将配体与甲基或 [(三甲基甲硅烷基) 甲基] 锂 (LiCH2TMS) 溶液组合。通过微调碱量,在原位程序中使用 LiCH2TMS 被证明是最容易进行反应并获得可靠结果的方法。对各种配体的筛选导致选择了苄基、吡啶基或萘基修饰的联萘二胺,用于在吡咯烷或哌啶中环化共轭氨基二烯,具有迄今为止所描述的最高立体和对映选择性(分别高达 61 % 和 72 % ee) )。