Intramolecular cyclization of hydrazides of (2-alkylthio-3,4-dihydro-6-methyl-4-oxo-3-pyrimidml)acetic acids to 1,2,3,4-tetrahydropyrimido[2,1-c]-1,2,4-triazine-3,6-diones

A method has been developed for the synthesis of 1,2,3,4-tetrahydropyrimido2, 1-c]-1,2,4-triazine-3,6-diones by intramolecullar cyclization of hydrazides of (2-alkylthio-3,4-dihydro-6-methyl-4-oxo-3-pyrimidinyl)acetic acids in benzylamine.Vilnius University, Vilnius 2734. Translated Born Khimiya Geterotsiklicheskikh Soedinenii, No, 7, pp. 967–970, July, 1994. Original article submitted April 4, 1994.