Treatment of bromo alkylidenemalonates (1)–(4) with ammonia or amines afforded 3,4-condensed heteroaromatic pyrroles (5)–(8) in excellent yields; benzotripyrroles (19)–(21) were synthesized by the same method.
C. Sha, C. Tsou, Y. Li, R. Lee, F. Tsai and R. Yeh, J. Chem. Soc., Chem. Commun., 1988, 1081 DOI: 10.1039/C39880001081
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