The Configurational Stability of an Enantioenrichedα-Thiobenzyllithium Derivative and the Stereochemical Course of Its Electrophilic Substitution Reactions; Synthesis of Enantiomerically Pure, Tertiary Benzylic Thiols[1,2]
作者:Oliver Stratmann、Bernd Kaiser、Roland Fröhlich、Oliver Meyer、Dieter Hoppe
DOI:10.1002/1521-3765(20010119)7:2<423::aid-chem423>3.0.co;2-y
日期:2001.1.19
The lithium compound (S)-7, formed by deprotonation of the (S)-S-1-phenylethyl thiocarbamate (S)-10, is configurationally stable at -70 degrees C. Even at elevated temperatures it racemizes only very slowly. It represents the first essentially enantiopure alpha-thiocarbanion derivative and can be utilized in asymmetric synthesis. Most electrophiles (except proton acids) add to (S)-7 with complete stereoinversion
通过 (S)-S-1-苯基乙基硫代氨基甲酸酯 (S)-10 脱质子形成的锂化合物 (S)-7 在 -70 摄氏度时构型稳定。即使在升高的温度下,它的外消旋化也非常缓慢。它代表了第一个基本上对映体纯的 α-硫代碳阴离子衍生物,可用于不对称合成。大多数亲电试剂(质子酸除外)与 (S)-7 完全立体反转。取代产物的裂解导致实际上对映纯的叔 1-苯基链烷硫醇。