Microwave-Assisted One-Pot Synthesis of Pyrazolo[3,4-b]indoles and New Isoxazolo[5,4-b]indoles via Copper-Catalyzed Intramolecular C-N/C-O Bond Formation - Kumar, Arepalli Sateesh; Rao, P. V. Amulya; Nagarajan, Rajagopal (Synthesis, 2011)