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Paper | Regular issue | Vol 24, No. 1, 1986, pp.93-100
Published online, 1st January, 1970
DOI: 10.3987/R-1986-01-0093
s-Triazolo[4,3-a][1,3]diazacycloalkanes III. A Novel Synthesis of 2-Aryl-3-oxo-2,3,5,6,7,8-hexahydro-s-triazolo[4,3-a]pyrimidines

Izabella Krezel*

*Department of Pharmaceutical Chemistry, 90-145, Lodz, Narutowicza 120a, Poland


A novel synthesis of s-triazolo[4,3-a]pyrimidines is described. Arylhydrazine hydrochlorides react easily with 1-ethoxycarbonyl-2-methylthio-1,4,5,6-tetrahydropyrimidine to form hydrochlorides of cyclic arylaminoguanidines, which are then cyclized in aqueous K2CO3 medium into s-triazolo[4,3-a]pyrimidines.