α-Hydroxylactams (8), formed by regioselective reduction or Grignard addition to pyridine-2,3-dicarboximides (7), undergo acid-catalysed cyclodehydration to give the new pyrido[2′,3′ : 3,4]-pyrrolo fused heterocyclic systems (10)–(13).
G. J. Hitchings and J. M. Vernon, J. Chem. Soc., Chem. Commun., 1988, 623 DOI: 10.1039/C39880000623
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