Carbonyl compounds having asymmetric carbon center at β position and phenylthio group on γ carbon were produced by the reaction of optically active 2-hydroxyalkyl phenyl sulfides with enolsilylethers in the presence of Lewis acid through “chiral episulfonium ions”.
Retention of configuration in the ritter-type substitution reaction of chiral β-arylthio alcohols through the anchimeric assistance of the arylthio group
作者:Akio Toshimitsu、Chitaru Hirosawa、Kohei Tamao
DOI:10.1016/s0040-4020(01)85367-9
日期:1994.1
In chiral alcohols bearing a phenylthio group at the β carbon atom. the hydroxy group is replaced by nitriles through the anchimericassistance of the phenylthio group to afford chiral amides with retention of configuration. This stereospecific Ritter-type reaction has been utilized in the conversion of chiral glycidol derivatives to chiral cyclic imino ethers such as oxazolines bearing an arylthio
Chiral oxiranes are converted into chiral aziridines viaβ-hydroxyalkly aryl sulfides and then β-tosylaminoalkyl aryl sulfides without loss of optical purity and with overall retention of configuration.
Ritter-type substitution reaction of optically active β-hydroxyalkyl phenyl sulfides was found to proceed with retention fo configuration through the participation of phenylthio group to afford optically active amides.