Chiral Indoline Synthesis via Enantioselective Intramolecular Copper-Catalyzed Alkene Hydroamination

An enantioselective copper-catalyzed hydroamination/cyclization of N-sulfonyl-2-allylanilines for the synthesis of chiral 2-methylindolines is reported. Chiral 2-methylindolines are important subunits in drugs and bioactive compounds. This method provides chiral N-sulfonyl-2-methylindolines in up to 90% ee.