1: NaBH4 / ethanol / 0.5 h / Ambient temperature 2: 55 percent / PPh3, I2, imidazole / CH2Cl2 / 0.75 h / Ambient temperature 3: 2 h / 120 °C 4: 1.) borane methyl sulfide, 2.) 3 N aq. NaOH, 30percent aq. H2O2 / 1.) THF, 0 deg C, 2 h; r.t., 2.5 h, 2.) EtOH, 0 deg C, 30 min; r.t., 2 h 5: 1.) DMSO, oxalyl chloride, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 15 min, 2.) -78 deg C, 45 min 6: NaH / tetrahydrofuran / 1.) r.t., 30 min, 2.) 0 deg C, 45 min View Scheme