SYNTHESIS OF NOVEL 5-ALKOXYCARBONYL-5,6-DIHYDROPYRIMIDIN-4(3H)-ONES FROM 3-SUBSTITUTED 2-ALKOXYCARBONYL-2-PROPENOATES AND AMIDINES
A cyclization of 3-substituted 2-alkoxycarbonyl-2-propenoates with acetamidine, benzamidine, guanidine, or 1,1-dimethylguanidine hydrochloride in the presence of 1-2 eq of metal alkoxide afforded novel 5-alkoxycarbonyl-5,6-dihydropyrimidin-4(3H)-ones in g