Intramolecular base-catalysed 1,5-elecctrocyclization of aldehyde imines derived from o-aminophenyl succinimide (3) in the presence of a chiral alcohol yields chiral indolines (4) with optical purities ranging from 17 to 31%.
S. J. Veenstra and W. N. Speckamp, J. Chem. Soc., Chem. Commun., 1982, 369 DOI: 10.1039/C39820000369
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