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The nature of a substituent on the pyrrole ring of 3-indolecarbaldehyde plays a significant role in governing the regioselectivity of metalation. To confirm the structures of the products, varios indoles carrying a carbon side chain at the 4-, 5-, 6-, or 7-position were prepared by other methods.Synthesis of 5-substituted 1-hydroxyindoles is also described

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

The chemistry of indoles. XXXIII Substituent effect in regioselective metalation of 3-indolecarbaldehyde and syntheses of indoles carrying a carbon side chain at the 4-, 5-, 6-, or 7-position.