Highly stereoselective reduction of acyclic α-sulfinyl ketimines: synthesis of enantiomerically pure β-aminosulfoxides
作者:José L Garcı́a Ruano、Marta M Cifuentes、Antonio Lorente、Jesús H Rodrı́guez Ramos
DOI:10.1016/s0957-4166(99)00523-6
日期:1999.12
DIBAL reduction of enantiomerically pure α-sulfinyl ketimines can be achieved almost completely stereoselectively under ZnX2 catalysis, regardless of the alkyl or aryl substituent at nitrogen and the aliphatic (cyclic or acyclic) or aromatic character of the imine. Steric factors as well as the electrophilic character of the hydride are responsible for the stereochemical course of the reduction.
Enantiomerically pure 2-alkyl and 2,3-dialkylaziridines from 2-sulfinylimines
作者:JoséL. García Ruano、Antonio Lorente、Jesús H. Rodríguez Ramos
DOI:10.1016/s0040-4039(98)02168-6
日期:1998.12
A newentry to optically pure aziridines from N-p-methoxyphenyl derivatives of 2-p-tolylsulfinylketimines is reported. The highly stereoselective reduction of the imines with DIBAL-H/ZnX2 yielded the corresponding sulfinyl amines, which can be transformed into the N-Cbz derivatives through a two-step sequence involving reaction with BnO2CCl and subsequent oxidation with CAN. These compounds were easily