Synthesis of novel pyrazolino[3',4':5,4]cyclopent[b]indoles

摘要

Several new pyrazolino[3',4':5,4]cyclopent[b]indoles 2a-e have been synthesized from the reaction of 2-(4'-methoxy)benzyl-idene-1-oxo-1H,8H-2,3-dihydrocyclopent[b]indoles 1a-e with hdyrazine hydrate in ethanol in good yield.Indole is the main constituent unit in many of the alkaloids of the natural origin.