1.1: 83 percent / BuLi / tetrahydrofuran / 2 h / -78 - 20 °C 2.1: 63 percent / piperidine / CuI; (PPh3)4Pd / 1 h / 20 °C 3.1: borane*THF; cyclohexene / tetrahydrofuran / 1 h / 0 °C 3.2: 82 percent / HOAc / tetrahydrofuran / 2 h / 0 °C View Scheme

n-butyllithium in tetrahydrofuran; hexane T=-78°C; 2 h;