Synthesis of 1,4-dihydropyrimido[2,1-c][1,2,4]triazin-6-ones involving a new ring expansion
Abstract
The reaction of hydrazine with various thiazolo[3,2-a]pyrimidin-5-ones and an oxazolo[3,2-a]pyrimidin-5-one to give 1,4-dihydropyrimido[2,1-c][1,2,4]triazin-6-ones has been studied. The position of alkylation in the products was determined.