Rhodium(II,II) Dimer as an Efficient Catalyst for Aziridination of Sulfonamides and Amidation of Steroids

Unsaturated sulfonamides underwent direct intramolecular aziridination catalyzed by Rh2(OAc)4 with PhI(OAc)2 and Al2O3 to give the corresponding aziridine products in excellent yields (up to 98%) and with good to excellent conversions. High turnovers (up to 1375) were achieved. The intermolecular rhodium-catalyzed amidation of cholesteryl acetate with PhINTs or PhI(OAc)2/NH2R as the nitrogen source exhibited both excellent regio- and α-selectivity (α/β ratio up to 9:1).