1: 1) THF, diethylether, a) -78 deg C, 1h, b) to -10 deg C, 2) room temp., 30 min 3: 85 percent / bis(trifluoroacetoxy)-iodobenzene / acetonitrile; H2O / Ambient temperature 4: 89 percent / trifluoroacetic acid, sodium borohydride / ethanol / Ambient temperature View Scheme