Synthesis of 2-Phenyl-4,5-Substituted Oxazoles by Copper-Catalyzed Intramolecular Cyclization of Functionalized Enamides
作者:S. Vijay Kumar、B. Saraiah、N. C. Misra、H. Ila
DOI:10.1021/jo3021192
日期:2012.12.7
An efficient two-step synthesis of 2-phenyl-4,5-substituted oxazoles involving intramolecularcopper-catalyzed cyclization of highly functionalized novel β-(methylthio)enamides as the key step has been reported. These enamides are obtained by nucleophilic ring-opening of newly synthesized 4-[(methylthio)hetero(aryl)methylene]-2-phenyl-5-oxazolone precursors by alkoxides, amines, amino acid esters and