Stereoselective Synthesis and Reactions of Secondary Alkyllithium Reagents Functionalized at the 3-Position
作者:Kohei Moriya、Dorian Didier、Meike Simon、Jeffrey M. Hammann、Guillaume Berionni、Konstantin Karaghiosoff、Hendrik Zipse、Herbert Mayr、Paul Knochel
DOI:10.1002/anie.201409165
日期:2015.2.23
Secondary alkyllithium reagents bearing an OTBS group (TBS=tert‐butyldimethylsilyl) at the 3‐position can be prepared stereoconvergently through an I/Li exchange from a diastereomeric mixture of the corresponding secondary alkyl iodides. These lithium reagents react with a range of electrophiles, including carbon electrophiles, with retention of configuration to yield various 1,3‐difunctionalized derivatives
可以通过I / Li交换从相应的仲烷基碘化物的非对映异构体混合物中立体聚合制备在3位带有OTBS基团(TBS =叔丁基二甲基甲硅烷基)的仲烷基锂试剂。这些锂试剂可与多种亲电试剂(包括碳亲电试剂)反应,并保留构型,以产生具有良好非对映选择性的各种1,3-双官能化衍生物。动力学研究表明,3-甲硅烷氧基可大大加速锂取代的碳原子上的差向异构。该方法为构建具有出色立体选择性的手性开链分子提供了新途径。