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Condensed benzopyrans. IV. Synthesis of some derivatives of 7H- and 9H-pyrano[3,2-E]indoles |
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| 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. |
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