1.1: Et3SiH; TFA / CH2Cl2 / 12 h / 20 °C 1.2: 91 percent / H2 / PtO2 / ethanol / 0.5 h / 750.06 Torr 2.1: i-PrMgCl*LiCl / tetrahydrofuran / 5 h / 20 °C 2.2: 87 percent / tetrahydrofuran / 20 h / 20 °C 3.1: 92 percent / aq. HCl / 4 h / Heating 4.1: 90 percent / BSA; TMS triflate / acetonitrile / 3.5 h / -45 - 20 °C View Scheme

1.1: Et3SiH; TFA / CH2Cl2 / 12 h / 20 °C 1.2: 91 percent / H2 / PtO2 / ethanol / 0.5 h / 750.06 Torr 2.1: i-PrMgCl*LiCl / tetrahydrofuran / 5 h / 20 °C 2.2: 87 percent / tetrahydrofuran / 20 h / 20 °C 3.1: 92 percent / aq. HCl / 4 h / Heating View Scheme