dirhodium tetraacetate in dichloromethane

Multi-step reaction with 2 steps 1: 85 percent / diisopropyl amine, n-BuLi / tetrahydrofuran / 1.) -78 deg C, 2.) r.t.2: 85 percent / methanesulfonyl azide, triethylamine / acetonitrile / 3 h / Ambient temperature