1.1: Mg / tetrahydrofuran / 0.83 h / 20 °C 1.2: 73 percent / TMEDA / tetrahydrofuran / 1.5 h / -78 °C 2.1: BF3*OEt2; Ph3SiH / CH2Cl2 / 2.5 h / -78 - 20 °C 2.2: DIBAL-H / toluene / 3 h / -78 °C 2.3: 826 mg / Cs2CO3 / toluene; propan-2-ol / 17 h / 20 °C 3.1: 97 percent / NaHMDS / tetrahydrofuran / 2 h / -78 °C 4.1: 84 percent / second generation Grubbs catalyst / CH2Cl2 / 16 h 5.1: 76 percent / Et3N; OsO4 / tetrahydrofuran / 22 h / -78 - 20 °C 6.1: 95 percent / NaIO4 / tetrahydrofuran; H2O / 1.5 h / 20 °C 7.1: 99 percent / TMSI / acetonitrile / 0.33 h / -10 °C View Scheme