Asymmetric chemical oxidations of aryl and alkyl 2-(trimethylsilyl)ethyl sulfides
作者:Adrian L. Schwan、Mark F. Pippert
DOI:10.1016/0957-4166(94)00368-l
日期:1995.1
A collection of aryl and alkyl 2-(trimethylsilyl)methyl sulfides have been converted to their respective sulfoxides by four different asymmetric oxidizing agents. The chemical yields range from 44–98% while the enantiomeric excesses range from 0–89%. The Davis oxazaziridine (3′S,2R)-(−)-N-(phenylsulfonyl)-(3,3-dichlorocamphoryl)oxaziridine was shown to be superior to the. Modified Sharpless Reagent
Stereoselective Reaction of α-Sulfinyl Carbanion Derived from Chiral 2-(Trialkylsilyl)ethyl Sulfoxides: Evidence for a Novel Silicon−Oxygen Interaction
Reactions of alpha-sulfinyl carbanions, derivedfrom p-tolyl sulfoxides bearing various alkyl groups, with various electrophiles were examined. The reaction of alpha-sulfinyl carbanions, derivedfrom the beta-silylethyl sulfoxides, with ketones or trimethyl phosphate, gave the syn products with high stereoselectivity. Interaction between the silicon in the trialkylsilyl group and the carbonyl oxygen