2: 66 percent / Et3N / 20 h / Ambient temperature 3: 1) s-Bu3BHLi, 2) H2O2 / 1) THF, -78 deg C, 30 min, 2) THF, H2O, to r.t. 4: KOH / methanol / 2 h / 60 °C 5: 99 percent / imidazole / dimethylformamide / 3 h / 80 °C 6: VO(acac)2, tert-butylhydroperoxide / CH2Cl2 / 3 h / 0 °C 7: 89 percent / pyridine, 4-(N,N-dimethylamino)pyridine / 48 h / Ambient temperature 8: 67 percent / CrO3, AcOH / CH2Cl2; H2O / 2 h 9: 1) 2,6-lutidine, trimethylsilyl trifluoromethanesulfonate, 2) Bu4NF, AcOH / 1) CH2Cl2, -60 deg C to 10 deg C, 2 h, 2) THF, 30 min 10: 86 percent / N,N-diethyl-N<<(methoxycarbonyl)amino>sulfonyl>ethanaminium hydroxide / benzene / 0.25 h / 80 °C 11: 85 percent / Bu4NF, AcOH / tetrahydrofuran; H2O / 29 h View Scheme