1: CdCO3 / benzene 2: MeONa / methanol View Scheme

1: trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 0 °C 2: methanol; sodium methylate / dichloromethane / 1 h View Scheme

sulfuric acid in ethanol

sulfuric acid in ethanol

1: steroidal saponin-β-glucosidase from Aspergillus flavus / aq. buffer / 50 °C / pH 5 / |Enzymatic reaction 2: steroidal saponin-α-1,2-rhamnosidase from C. lunata / aq. buffer / 50 °C / pH 5 / |Enzymatic reaction View Scheme

sulfuric acid in 1,4-dioxane T=100°C; 4 h;

dioscin-α-L-rhamosidase Enzyme kinetics; Further Variations:pH-valuesTemperaturesReagents;

steroidal saponin-β-glucosidase from Aspergillus flavus in aq. buffer T=50°C; pH=5; Enzymatic reaction;

hydrogenchloride in methanol T=90°C; 1 h;

1: p-TsOH / dimethylformamide 2: 73 percent / DCC; DMAP / CH2Cl2 / 20 °C 3: 87 percent / NIS; TMSOTf / CH2Cl2 / -30 - 20 °C 4: 92 percent / HOAc / H2O / 3 h / 80 °C 5: 93 percent / imidazole; DMAP / dimethylformamide / 20 °C 6: 58 percent / BF3*Et2O / CH2Cl2 / -40 - 20 °C 7: 95 percent / CAN / CH2Cl2; methanol / 1 h / 20 °C 8: 81 percent / NaOMe / methanol / 20 °C View Scheme