Asymmetric synthesis of oxygen- and nitrogen-substituted difluoromethylene products
作者:Pierfrancesco Bravo、Massimo Pregnolato、Giuseppe Resnati
DOI:10.1021/jo00035a035
日期:1992.4
1,1-Difluoroalkyl sulfinylmethyl ketones 3 are synthesized in enantiomerically pure form through acylation of (+)-(R)-methyl p-tolyl sulfoxide (1) with alpha,alpha-difluorocarboxylates 2. These ketones have been reduced with complete diastereoselection to give the corresponding alcohols. Removal of the auxiliary sulfinyl group and further elaborations afforded enantiomerically pure 2-(benzyloxy)-3,3-difluoro alcohols, esters, oximes, hydroxylamines, and nitriles.