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Intramolecular propargylic amination of propargylic acetates bearing an amino group at the suitable position in the presence of chiral copper-pybox complexes proceeds enantioselectively to give optically active 1-ethynyl-isoindolines (up to 98% ee). The method described in this communication provides a useful synthetic approach to the enantioselective preparation of nitrogen containing heterocyclic compounds with an ethynyl group at the α-position.

Enantioselective intramolecular propargylic amination using chiral copper–pybox complexes as catalysts