1: 136 mg / triethylamine / CH2Cl2 / 10 h / 20 °C 2: 94 percent / 1,3-propanedithiol; aq. HCl / 2,2,2-trifluoro-ethanol / 4 h / 60 °C 3: 53 percent / triethylamine / CH2Cl2 / 12 h / 20 °C 4: Dess-Martin periodinane / CH2Cl2 / 2 h / 20 °C 5: 66 mg / NaH2PO4; NaClO2; 2-methyl-2-butene / 2-methyl-propan-2-ol; H2O; tetrahydrofuran / 1.5 h / 0 °C 6: K2CO3; MeOH / 15 h / 20 °C 7: 42.5 mg / pyridine; BOPCl / acetonitrile / 2 h / 20 °C 8: 57 percent / pyridine; Ph3PCl2 / acetonitrile / 18 h / 20 °C 9: 60 percent / Dess-Martin periodinane / CH2Cl2 / 2 h / 20 °C 10: 56 percent / EXP-B1Y ketoreductase; NAD(1+); glucose dehydrogenase / glucose / dimethylsulfoxide; aq. phosphate buffer / 0.67 h / 37 - 39 °C / pH 6.9 View Scheme