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Synthesis of tetrahetrocyclic systems including pyrido[2′,3′:3, 4]pyrazolo[1,5-a]pyrimidine fused with pyrazole derivatives and isolated with 1,3,4-oxa-, thiadiazole, and 1,2,4-tetrazole derivatives
El-Essawy, Farag A.
experimental part, p. 318 - 323 (2010/06/13)
(Chemical Equation Presented) A series of isolated and fused tetracyclic compounds, containing pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine linked with 1,3,4-oxa-, thiadiazole, 1,2,4-tetrazole, and pyrazole derivatives were prepared by the reaction of 1,8,10-trimethyl-4-oxo-1,4- dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine-3-carboxylate and some common reagents to provide the product in satisfactory yields.
