1.1: NaH; imidazole / tetrahydrofuran / 0.5 h / 20 °C 1.2: tetrahydrofuran / 2 h / 60 °C 1.3: 99 percent / tetrahydrofuran / 1 h / 0 - 20 °C 2.1: 91 percent / n-Bu3SnH; AIBN / benzene / 2 h / 80 °C 3.1: 49 percent / HCl / methanol / 0.5 h / 40 °C 4.1: 50 percent / Ph3P; DEAD / tetrahydrofuran / 1.5 h / 20 °C View Scheme