Microwave assisted solvent-free synthesis of pyrazolo[3,4-b]quinolines and pyrazolo[3,4-c]pyrazoles using p-TsOH

Pyrazolo[3,4-b]quinolines and pyrazolo[3.4-c]pyrazoles have been synthesized from beta -chlorovinylaldehydes and hydrazine hydrate/phenylhydrazine using p-TsOH under microwave irradiation. (C) 2001 Elsevier Science Ltd. All rights reserved.