1.1: 96 percent / aq. HCl / tetrahydrofuran / 6 h / Heating 2.1: NaH / tetrahydrofuran / 1 h / 0 °C 2.2: 81 percent / tetrahydrofuran / 4 h / -20 - 20 °C 3.1: 76 percent / Et3SiH; TFA / 48 h / 110 - 120 °C 4.1: 80 percent / EtMgBr / tetrahydrofuran / 3 h / 20 °C 5.1: N-fluorobenzenesulfonimide; [Pd2((S)-DM-BINAP)2(μ-OH)2](2+)*2TfO(1-) / acetone / 18 h / 0 °C 6.1: TFA / CH2Cl2 / 8 h / 20 °C View Scheme