Original Articles
Abdulkarim M. A. Al-Kadasi, G.
Abstract
A facile and efficient ultrasound assisted Chlorosulfonic acid catalyzed one pot synthesis of benzopyranopyrimidines under solvent free condition via three-component condensation of 4-Hydroxy-coumarin with various substituted benzaldehydes and urea/thiourea was developed. This method gives the desired product in excellent yields in short reaction time with ease of work up.