Enantioselective and Diastereoselective Tsuji-Trost Allylic Alkylation of Lactones: An Experimental and Computational Study
作者:Panos Meletis、Mahendra Patil、Walter Thiel、Walter Frank、Manfred Braun
DOI:10.1002/chem.201101406
日期:2011.9.26
The Tsuji–Trost protocol has been successfully employed for the allylic alkylation of preformed lactone enolates. It has been demonstrated that this Pd‐catalyzed reaction can be carried out in an enantio‐ and diastereoselective manner. The use of additives, such as LiCl, was found to be crucial for reaching high levels of product selectivity. For one particular pair of reactants, density functional
Tsuji–Trost协议已成功用于预制内酯烯醇盐的烯丙基烷基化。已经证明该钯催化的反应可以对映和非对映选择性的方式进行。发现使用添加剂(例如LiCl)对于达到高水平的产品选择性至关重要。对于一对特定的反应物,使用密度泛函理论研究亲核加成的机理。在五个途径考虑,一个(烯丙基)的Pd(BINAP)配合物和之间的反应的氯化锂,烯醇化锂加合物被预测为对C的最可能的路线C键形成。LiCl作为贵金属和烯醇化物在动力学上有利的过渡态之间的连接键起着关键作用。计算的非对映选择性比与实验观察值非常吻合。