hydrogenchloride in dichloromethane 5.5 h; Ambient temperature;

1: 54 percent / methanol / 1) 1h, 5-10 deg C; 2) 48 h room temp. 2: 78 percent / NaBH4 / ethanol / 1) 7.5 h (addition); 2) 14h room temp. 3: 76 percent / 12 N HCl / CH2Cl2 / 5.5 h / Ambient temperature View Scheme

1: 78 percent / NaBH4 / ethanol / 1) 7.5 h (addition); 2) 14h room temp. 2: 76 percent / 12 N HCl / CH2Cl2 / 5.5 h / Ambient temperature View Scheme