Synthesis of derivatives of 5-amino-7-oxo(6h)-1,3-dithiolo[4,5-d]pyrimidine on the basis of 2-amino-(1h,5h)pyrimidine-4,6-dione

The betaine of 2-amino-5-phenyliodonio(1H,5H)pyrimidine-4,6-dione, upon interaction with sodium diethyldithiocarbamate, forms the previously unknown 2-amino-5-diethylaminothiocarbonylthio (1H,5H)pyrimidine-4,6-dione, the cyclization of which in concentrated sulfuric acid leads to salts of 2-diethylimmonio-5-amino(6H)-1,3-dithiolo[4,5-d]pyrimidin-7-one — a new heterocyclic system. The salts serve as the starting material for obtaining 5-amino-7-oxo(6H)-1,3-dithiolo[4,5-d]pyrimidine-2-selenone and -2-thione.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1117–1121, August, 1992.