α-methoxy isopropyl hydroperoxide in methanol

lithium diisopropyl amide in tetrahydrofuran a) -65 deg C -> 0 deg C, 2 h, b) 0 deg C, 0.5 h;

1: 1.) lithium diisopropylamide / 1) THF, -60 deg C, 10 min; 2) THF, -60 deg C, 10 min 2: 38 percent / lithium diisopropylamide / tetrahydrofuran / 1) -65 --> 0 deg C, 2 h; 2) 0 deg C, 0.5 h View Scheme

zinc(II) iodide in acetonitrile r.t. 1 h., 70 deg C. 14 h.;

methanesulfonic acid; acetic anhydride in dichloromethane