1: carbon dioxide; C20H26ClNO2Si With cesium fluoride in N,N-dimethyl-formamide T=20°C; P=760.051 Torr; 1 h; 2: diazomethane With N-methyl-N'-nitro-N-nitroso-guanidine; potassium hydroxide in diethyl ether; water T=0°C; 0.166667 h;

1: carbon dioxide; N-(tert-butoxycarbonyl)-α-(phenylsulfonyl)-4-chlorobenzylamine With toluene-4-sulfonic acid; cesium fluoride; Me2PhSiBpin in N,N-dimethyl-formamide T=20°C; P=3750.38 Torr; 3 h; 2: diazomethane in diethyl ether

1: carbon dioxide; N-(tert-butoxycarbonyl)-α-(phenylsulfonyl)-4-chlorobenzylamine With TMS-SnBu3; cesium fluoride in N,N-dimethyl-formamide T=100°C; P=7500.75 Torr; 3 h; 2: diazomethane in diethyl ether

1: carbon dioxide; C24H42ClNO2Sn With cesium fluoride in N,N-dimethyl-formamide T=100°C; P=7500.75 Torr; 3 h; Autoclave; 2: With hydrogenchloride in diethyl ether; water; N,N-dimethyl-formamide T=0°C; pH=2; Inert atmosphere; 3: diazomethyl-trimethyl-silane in methanol; diethyl ether 1 h; Inert atmosphere;

1: formic acid / methanol; water / 60 h / 20 °C 2: cesium fluoride; toluene-4-sulfonic acid; Me2PhSiBpin / N,N-dimethyl-formamide / 3 h / 20 °C / 3750.38 Torr View Scheme

1: formic acid / methanol; water / 60 h / 20 °C 2: cesium fluoride; toluene-4-sulfonic acid; Me2PhSiBpin / N,N-dimethyl-formamide / 3 h / 20 °C / 3750.38 Torr View Scheme

1.1: potassium carbonate; Na(1+)*O4S(1-) / tetrahydrofuran / 7 h / |Reflux 2.1: tetrahydrofuran / 0.33 h / -78 °C 3.1: cesium fluoride / N,N-dimethyl-formamide / 1 h / 20 °C / 760.05 Torr 3.2: 0.17 h / 0 °C View Scheme

1: formic acid / methanol; water / 60 h / 20 °C 2: TMS-SnBu3; cesium fluoride / N,N-dimethyl-formamide / 3 h / 100 °C / 7500.75 Torr View Scheme

1: formic acid / methanol; water / 60 h / 20 °C 2: TMS-SnBu3; cesium fluoride / N,N-dimethyl-formamide / 3 h / 100 °C / 7500.75 Torr View Scheme