1: 89 percent / Bu4NF / tetrahydrofuran / 0.17 h / 20 °C 2: 65 percent / NH3; Na / tetrahydrofuran / 0.25 h / -78 °C View Scheme

1: 89 percent / Bu4NF / tetrahydrofuran / 0.17 h / 20 °C 2: 65 percent / NH3; Na / tetrahydrofuran / 0.25 h / -78 °C 3: 55 percent / Et3N / tetrahydrofuran / 3 h / 20 °C View Scheme