A convenient method for the synthesis of ethyl 6-substituted 6,7,8,9-tetrahydro-2-thia-3,5,6,9-tetraazabenz[cd]azu-lene-1-carboxylates – representing a new heterosystem – from the corresponding ethyl 4,5-diaminothieno[2,3-d]pyrimidine-6-carboxylates, by a two-step protocol is described.
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