Pyrazolo[3,4-d]thiazolo[3,2-a]pyrimidines were formed on halogenation of 5-allyl-6-thioxopyrazolo[3,4-d]-pyrimidin-4-one, whereas 5-ethylsulfanyl-2-halomethyl[1,3]oxazolo[3,2-c]pyrazolo[4,3-e]pyrimidinium tri-halogenides were formed from 5-allyl-6-ethylsulfanyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, 526–531, March, 2013.
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Svaljavyn, O.V., Onysko, M.Y., Turov, A.V. et al. Peculiar electrophilic heterocyclization of 5-allyl-6-thioxopyrazolo[3,4-d]pyrimidin-4-one. Chem Heterocycl Comp 49, 491–495 (2013). https://doi.org/10.1007/s10593-013-1273-6
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DOI: https://doi.org/10.1007/s10593-013-1273-6