1: 62 percent / Et3N, DMAP / CH2Cl2 / 6 h / Ambient temperature 2: 87 percent / HCl / tetrahydrofuran; H2O / 3 h / Ambient temperature 3: KBH4 / methanol / 10 h / 0 °C 4: 74 percent / H2SO4 / H2O / 0.5 h / 90 °C View Scheme

dichloromethoxy methane in dichloromethane 1.) room temperature, 20 min, 2.) 50-55 deg C, 30 min;