1: 82 percent / Rh2(OAc)4*H2O / various solvent(s) / 0.5 h / 60 °C 2: 100 percent / H2O; dimethylsulfoxide / 1 h / 150 °C View Scheme

in water; dimethyl sulfoxide T=150°C; 1 h;

1.1: tetrahydrofuran / 20 °C 2.1: aq. H2SO4 / dioxane / 6 h / Heating 3.1: 135 g / H2; AcOH / Pd(OH)2/C / 12 h / 20 °C / 760 Torr 4.1: (COCl)2; DMF / toluene / 4 h / 20 °C 5.1: KHMDS / tetrahydrofuran; toluene / 1 h / -78 °C 5.2: tetrahydrofuran; toluene / 1 h / -78 °C 6.1: 106 g / 4-acetoamidobenzenesulfonyl azide; Et3N / acetonitrile / 2 h / 20 °C 7.1: 82 percent / Rh2(OAc)4*H2O / various solvent(s) / 0.5 h / 60 °C 8.1: 100 percent / H2O; dimethylsulfoxide / 1 h / 150 °C View Scheme

1.1: aq. H2SO4 / dioxane / 6 h / Heating 2.1: 135 g / H2; AcOH / Pd(OH)2/C / 12 h / 20 °C / 760 Torr 3.1: (COCl)2; DMF / toluene / 4 h / 20 °C 4.1: KHMDS / tetrahydrofuran; toluene / 1 h / -78 °C 4.2: tetrahydrofuran; toluene / 1 h / -78 °C 5.1: 106 g / 4-acetoamidobenzenesulfonyl azide; Et3N / acetonitrile / 2 h / 20 °C 6.1: 82 percent / Rh2(OAc)4*H2O / various solvent(s) / 0.5 h / 60 °C 7.1: 100 percent / H2O; dimethylsulfoxide / 1 h / 150 °C View Scheme

1.1: (COCl)2; DMF / toluene / 4 h / 20 °C 2.1: KHMDS / tetrahydrofuran; toluene / 1 h / -78 °C 2.2: tetrahydrofuran; toluene / 1 h / -78 °C 3.1: 106 g / 4-acetoamidobenzenesulfonyl azide; Et3N / acetonitrile / 2 h / 20 °C 4.1: 82 percent / Rh2(OAc)4*H2O / various solvent(s) / 0.5 h / 60 °C 5.1: 100 percent / H2O; dimethylsulfoxide / 1 h / 150 °C View Scheme

1.1: KHMDS / tetrahydrofuran; toluene / 1 h / -78 °C 1.2: tetrahydrofuran; toluene / 1 h / -78 °C 2.1: 106 g / 4-acetoamidobenzenesulfonyl azide; Et3N / acetonitrile / 2 h / 20 °C 3.1: 82 percent / Rh2(OAc)4*H2O / various solvent(s) / 0.5 h / 60 °C 4.1: 100 percent / H2O; dimethylsulfoxide / 1 h / 150 °C View Scheme