SYNTHESIS OF SOME 3-SUBSTITUTED 4(3H)-QUINAZOLINONE AND 4(3H)-QUINAZOLINETHIONE DERIVATIVES AND RELATED FUSED BIHETEROCYCLIC RING SYSTEMS
The reactions of 2-phenyl-4(3H)-quinazolinone, 2-phenyl-3-amino-4(3H)-quinazolinone, and corresponding thiones with phenyl isocyanate or phenyl isothiocyanate were investigated.The resulting urea and thiourea quinazoline or quinazolinethione derivatives r