1: p-toluenesulfonyl chloride, Et3N / CH2Cl2 / 12 h / Ambient temperature 2: 85 percent / Na / liquid ammonia; tetrahydrofuran / 0.75 h / -78 °C View Scheme

1: p-toluenesulfonyl chloride, Et3N / CH2Cl2 / 12 h / Ambient temperature 2: 8 percent / Mg / methanol / 0.5 h / Ambient temperature; ultrasonication View Scheme