Methods for directfunctionalization of C–H bonds mediated by N-oxyl radicals constitute a powerful tool in modern organic synthesis. While several N-oxyl radicals have been developed to date, the lack of structural diversity for these species has hampered further progress in this field. Here we designed a novel class of N-oxyl radicals based on N-hydroxybenzimidazole, and applied them to the direct C–H functionalization
Enantioselective Acylation of Silyl Ketene Acetals through Fluoride Anion-Binding Catalysis
作者:James A. Birrell、Jean-Nicolas Desrosiers、Eric N. Jacobsen
DOI:10.1021/ja205602j
日期:2011.9.7
A highly enantioselective acylation of silyl ketene acetals with acyl fluorides has been developed to generate useful alpha,alpha-disubstituted butyrolactone products. This transformation is promoted by a new thiourea catalyst and 4-pyrrolidinopyridine and represents the first example of enantioselective thiourea anion-binding catalysis with fluoride.