1: NaBH4 / tetrahydrofuran / 2 h 2: ammonium hydrogen carbonate, H2O / CH2Cl2 / 60 h / α-chymotrypsin View Scheme

1: potassium carbonate 2: aq.-ethanolic KOH-solution View Scheme

1: NaBH4 / tetrahydrofuran / 2 h 2: ammonium hydrogen carbonate, H2O / CH2Cl2 / 60 h / α-chymotrypsin View Scheme

1: benzene / 2 h / Heating 2: 99 percent / imidazole / dimethylformamide / 5 h / 20 °C 3: K3Fe(CN)6; K2CO3; MeSO2NH2 / dihydroquinidine 1,4-anthraquinonediyl diether / 2-methyl-propan-2-ol; H2O / 24 h / 4 °C 4: 99 percent / Amberlite IR-120B (H+-form) / methanol / 38 h / Heating 5: 95 percent / KOH / methanol / 1 h / Heating View Scheme

1: NaBH4 / tetrahydrofuran / 2 h 2: ammonium hydrogen carbonate, H2O / CH2Cl2 / 60 h / α-chymotrypsin View Scheme