1: 82 percent / MeSO2Cl, Et3N / CH2Cl2 / 5 h / Ambient temperature 2: 55 percent / TBHP, SeO2 / CH2Cl2 / 48 h / Ambient temperature 3: 1N HCl / methanol / 1 h / Ambient temperature 4: BF3*Et2O / CH2Cl2 / 0.75 h 5: 90 percent / H2 / Raney Ni / ethyl acetate; methanol / 4 h / Ambient temperature 6: LDA / 0.08 h / -78 °C 7: 1) TFAA, DMSO 2) K-selectride / 1) 16h, 0 deg C; 2) Et2O, 0.5h 8: 1) imidazole 2) Jones reagent / 1) DMF View Scheme

Multi-step reaction with 7 steps 1: 82 percent / MeSO2Cl, Et3N / CH2Cl2 / 5 h / Ambient temperature2: 55 percent / TBHP, SeO2 / CH2Cl2 / 48 h / Ambient temperature3: 1N HCl / methanol / 1 h / Ambient temperature4: BF3*Et2O / CH2Cl2 / 0.75 h5: 90 percent / H2 / Raney Ni / ethyl acetate; methanol / 4 h / Ambient temperature6: LDA / 0.08 h / -78 °C7: 1) TFAA, DMSO 2) K-selectride / 1) 16h, 0 deg C; 2) Et2O, 0.5h