Enantioselective Acylation of Silyl Ketene Acetals through Fluoride Anion-Binding Catalysis
摘要:
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.
Enantioselective Acylation of Silyl Ketene Acetals through Fluoride Anion-Binding Catalysis
摘要:
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.