Aminopyrazoles. Part 3. Synthesis of the novel ring systems pyrazolo[4′,3′:5,6]pyrido[2,3-b][1,5]benzoxazepine and [1,5]benzothiazepine†

Two-step synthesis of the novel fused heterocycles pyrazolo[4′,3′:5,6]pyrido[2,3-b][1,5]benzoxazepine (8) and pyrazolo[4′,3′:5,6]pyrido[2,3-b][1,5]benzothiazepine (9) from the pyrazolo[3,4-b]pyridine derivative 1 is described.