1: With Ru2(esp)2SbF6 in dichloromethane 0.25 h; Molecular sieve; 2: With PhI(O2CtBu)2 in dichloromethane T=40°C; 24 h; chemoselective reaction;

1: 76 percent / formic acid; chlorosulfonyl isocyanate / CH2Cl2; pyridine / 25 °C 2: 84 percent / MgO; PhI(OAc)2 / Rh2(oct)4 / CH2Cl2 / 40 °C View Scheme

dirhodium tetraacetate in dichloromethane T=23°C;

silver hexafluoroantimonate; iron(III) phthalocyanine chloride; PhI(OPiv)2 in toluene; acetonitrile T=20°C; 6 h; Inert atmosphere; chemoselective reaction;

1.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 20 °C / Inert atmosphere 1.2: 20 °C / Inert atmosphere 2.1: silver hexafluoroantimonate; iron(III) phthalocyanine chloride; PhI(OPiv)2 / toluene; acetonitrile / 6 h / 20 °C / Inert atmosphere View Scheme