J. Svetlik
Dec 16, 1987
Citations
0
Influential Citations
3
Citations
Journal
European Journal of Organic Chemistry
Abstract
Pyrazolo[3,4-d]thiazolo[3,2-a]pyrimidine 3a, 5 and 6, pyrazolo[3′,4′:4,5]pyrimido[2,1-b][1,3]thiazine 3b, and pyrazolo-[3′,4′:4,5]pyrimido[2,1-b][1,3]thiazepine 3c representing novel heterocyclic systems were prepared by cyclization of 2,5-dihydro-6-mercapto-2-methyl-4H-pyrazolo[3,4-d]pyrimidin-4- one (1) with dibromoalkanes and bromoacetaldehyde diethyl acetal.