Imines of (2-aminophenyl)acetic acid give 2-substituted indole-3-carboxylic acids under mild conditions; the cyclisation is thought to involve a 1,5-dipole and initially to give the corresponding indolines.
R. Grigg and H. Q. N. Gunaratne, J. Chem. Soc., Chem. Commun., 1984, 661 DOI: 10.1039/C39840000661
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