Unexpected Recyclization of 1H-δ-Carbolines to Pyrrolo [1, 2-a] indoles

SY Ryabova, LM Alekseeva, AS Shashkov…

Index: Ryabova; Alekseeva; Shashkov; Granik Chemistry of Heterocyclic Compounds, 2003 , vol. 39, # 5 p. 654 - 659

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Abstract

Abstract When 1H-2-methyl-1-p-nitrophenyl-3-ethoxycarbonylpyrido [3, 2-b] indole (1) is heated in alcoholic solutions of ammonia, we observe a previously unknown recyclization leading to formation of 2-alkoxycarbonyl-3-methyl-9-p-nitrophenylimino-9H-pyrrolo [1, 2-a] indoles (3, 6).