4,5-Diamino-1-phenyl-1,7-dihydro-6H-pyrazolo[3,4-b]pyridin-6-one in the synthesis of fused tricyclic systems
2007
Starting from the substituted 4,5-diaminopyrazolo[3,4-b]pyridine, derivatives of a number of tricyclic systems, viz., imidazo[4,5-d]pyrazolo[3,4-b]pyridine, pyrazolo[3,4-b][1,2,5]thiadiazolo[3,4-d]pyridine, pyrazolo[3,4-b][1,2,3]triazolo[4,5-d]pyridine, and [1,3]oxazolo[5,4-b]pyrazolo[4,3-e]pyridine, were synthesized and reaction schemes for the processes were proposed.
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