Microwave Induced Stereoselective Conversion of Dialkyl 2-(Imido-N-yl)-3-(Triphenylphosphoranylidene)butanedioates to Electron-poor(Z)-N-Vinylimides in the Presence of Silica Gel Powder in Solvent-free Conditions

摘要

Silica gel was found to catalyze Stereoselective conversion of dialkyl 2-(imido-N-yl)-3-(triphenylphosphoranylidene)butanedioates to electron-poor(Z)-N-vinylimides in solvent-free conditions under microwave irradiation.beta-Additions of nucleophiles to the vinyl group of vinylic phosphonium salts leading to the formation of new alkylidenephosphoranes has attracted much attention as a very convenient and synthetically useful method in organic synthesis.