1: 30percent H2O2, KHCO3 / methanol; tetrahydrofuran / Heating 2: 100 percent / imidazole / dimethylformamide 3: iPrEtN, DMAP / CH2Cl2 4: TBAF / tetrahydrofuran 5: SO3*Py, Et3N / dimethylsulfoxide 6: NaClO2, NaH2PO4*2H2O, 2-methyl-2-butene / 2-methyl-propan-2-ol; H2O 7: CH2Cl2 8: 98 percent / AcCl / methanol View Scheme

1: 30percent H2O2, KHCO3 / methanol; tetrahydrofuran / Heating 2: 100 percent / imidazole / dimethylformamide 3: iPrEtN, DMAP / CH2Cl2 4: TBAF / tetrahydrofuran 5: SO3*Py, Et3N / dimethylsulfoxide 6: NaClO2, NaH2PO4*2H2O, 2-methyl-2-butene / 2-methyl-propan-2-ol; H2O 7: CH2Cl2 8: 98 percent / AcCl / methanol 9: 96 percent / aq. 1 M NaOH / tetrahydrofuran; H2O View Scheme