lithium aluminium tetrahydride; aluminium trichloride in diethyl ether; dichloromethane 6 h;

1: 79 percent / pyridine / 1.33 h / 0 °C 2: 57 percent / Et4NF / acetonitrile / 0.33 h / 50 °C / various fluorides, temp. 3: 18 percent / methanesulfonic acid / H2O / 0.5 h / Heating View Scheme