Enantioselective Intramolecular Benzylic CH Bond Amination: Efficient Synthesis of Optically Active Benzosultams

'Salen' along: The iridium(III)–salen complex 1 efficiently catalyzes the title reaction of 2-ethylbenzenesulfonyl azides to give five-membered sultams with high enantioselectivity. Other 2-alkyl-substitued substrates lead to five- and six-membered sultams with high enantioselectivity; the regioselectivity depends upon the substrate and the catalyst used. EDG=electron-donating...