Ultrasound-promoted synthesis of 2-aminothiophenes accelerated by DABCO utilizing PEG-200 as solvent

Chengyuan Liang, Zhishu Tang,

Abstract

An expeditious and greener one-pot procedure was developed for the synthesis of multisubstituted 2-aminothiophene derivatives. In the presence of catalytic amount of DABCO, ketones or aldehydes, dicyanomethane and elemental sulfur were converted into the corresponding 2-aminothiophene derivatives in moderate to high yields in PEG-200 under sonication.