1: tetrahydrofuran 2: LiN(iPr)2 / tetrahydrofuran 3: LiCl, methanesulfonyl chloride / dimethylformamide 4: K2CO3, CuI, Bu4NBr / dimethylformamide 5: 90 percent / H2 / Lindlar catalyst 6: 83 percent / Bu4NF, H2O / tetrahydrofuran 7: Dess-Martin periodinane, NaOAc / CH2Cl2 8: TiCl3*DME1.5, Zn-Cu / 1,2-dimethoxy-ethane / 36 h / 0 °C 9: 1.) MsCl, pyridine 2.) Bu4NOH / 1.) ether; 2.) THF 10: LiN(iPr)2 / tetrahydrofuran 11: 84 percent / Dess-Martin periodinane View Scheme