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Furo[2',3':4,5]pyrrolo[1,2-d][1,2,4]triazin-8(7H)-ones 5 were synthesized either by reaction of carbohydrazide 2 with triethyl orthoesters or by acetylation of methyl 4H-furo[3,2-b]pyrrole-5-carboxylate 1 followed by thionation of 4-acetylfuro[3,2-b]pyrrole-5-carboxylate 3 and cyclisation of thione 4 with hydrazine. Triazine 5a afforded the corresponding thione 7 by reaction with P2S5. Upon reaction with alkylor acylhalogenides compounds 5 and 7 gave N(7)-substituted products 6 and 8, respectively. Finally, triazino-triazinone derivative 9 was synthesized by cyclisation of thione 8b with hydrazine. Compounds 5 9 were evaluated for their antibacterial activity.

Synthesis of furo[2',3':4,5]pyrrolo[1,2-d][1,2,4]triazine derivatives and their antibacterial activity