1: 3N HCl / methanol / 0.33 h / Ambient temperature 2: 41 percent / t-BuOOH, Ti(O-i-Pr)4, L-(+)-DIPT, molecular sieves 4 Angstroem / CH2Cl2 / 4 h / -21 °C 4: 97 percent / imidazole / dimethylformamide 5: 1) disiamylborane, 2) 2N LiOH / 2) Pd(PPh3)4 / 1) THF, 0 deg C, 1h 6: 55 percent / n-Bu4NF / tetrahydrofuran / 12 h / Ambient temperature View Scheme