1.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C 1.2: BF3*Et2O / tetrahydrofuran; hexane / 1 h 2.1: 69 mg / TBAF / tetrahydrofuran / 5 h / 0 - 20 °C 3.1: Et3N / CH2Cl2 / 0.17 h / -10 °C 4.1: AD mix α; methanesulfonamide / 2-methyl-propan-2-ol; H2O / 48 h / 0 °C 5.1: 18 mg / Triton B / methanol / 24 h 6.1: 66 percent / Et3N; CuI / Pd(PPh3)4 / benzene; tetrahydrofuran / 2 h / 20 °C 7.1: H2 / Rh(PPh3)3Cl / benzene / 8 h 8.1: 1.0 mg / Me2S; BF3*Et2O / 0.08 h / 0 °C View Scheme