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Condensed benzopyrans. IV. Synthesis of some derivatives of 7H- and 9H-pyrano[3,2-E]indoles
Authors:Misbahul Ain Khan  Maria Lúcia De Brito Morley
Abstract:The hydrazones derived from coumarin-6-ylhydrazine and ethyl 6-hydrazinochromone-2-carboxylate undergo facile indolization to give 3H,7H-pyrano3,2-e]indol-7-ones (IIIb-IIIg) and ethyl 9-oxo-3H,9H-pyrano3,2-e]indole-7-carboxylates (IVb-IVd), respectively, in good yields. Compounds IVb-IVd are derivatives of a new ring system.
Keywords:
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