1: 1.) MCPBA, 2.) trimethylphosphite / 1.) CH2Cl2, -78 deg C, 2.) MeOH, reflux, 2.5 h 2: 93 percent / DEAD, Ph3P / tetrahydrofuran / 0.25 h 3: 85 percent / NaOMe / methanol / 2.5 h 4: 1.) Ac2O, Et3N, DMAP / 1.) CH2Cl2, 2.) -10 deg C 5: LiAlH4 / diethyl ether / 30 h / 0 °C 6: potassium hydride / toluene / 3 h / Heating 7: DMAP, Et3N / CH2Cl2 / 16 h / Ambient temperature 8: 1.) aq. HCl, 2.) Ag2CO3 / 1.) THF, 45 deg C, 2.) benzene, reflux, 4 h 9: 31 percent / BBr3 / CH2Cl2 / 6 h / -23 °C View Scheme