作者:Fraser F. Fleming、Wang Liu
DOI:10.1002/ejoc.200801053
日期:2008.12.19
Stereoselective alkylations of acyclic, metalated nitriles are intimately controlled by a remote stereocenter. Probing the optimal steric demand through alkylations with a series of substituted pentanenitriles reveal the fundamental requirements for 1,3-asymmetric induction. Relaying these requirements into a predictive model suggests that the stereoselectivity arises from a preferential electrophilic
无环金属化腈的立体选择性烷基化由远程立体中心密切控制。通过一系列取代戊腈的烷基化探索最佳空间需求揭示了 1,3-不对称诱导的基本要求。将这些要求传递到预测模型中表明立体选择性源于对金属化腈的更稳定的金刚石晶格构象的优先亲电攻击。使用这种策略,一系列金属化链烷腈选择性地拦截烷基化中的各种亲电子试剂,从而有效地安装新的四元中心。