Lactam and amide acetals. 56. Synthesis of pyrimidines from N-carbamoylamidines

N-Carbamoyl-N,N-dimethylformamidine reacts with ethyl anthranilate to give quinazoline-2,4-dione, and with cyanoacetamide to give 4-amino-5-carbamoylpyrimidin-2-one. The reaction of dimethylacetamide diethyl acetal with urea proceeds via N-carbamoyl-N,N-dimethylacetamidine with the subsequent formation of 4-dimethylamino-6-methyl-pyrimidin-2-one and 4,6-dimethyl-sym-triazin-2-oneFor Communication 55, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 81–84, January, 1990.