in benzene 16 h; Heating; Title compound not separated from byproducts;

in benzene 16 h; Heating;

1: 1.) lithium diisopropylamide / 1.) THF, hexane, -78 deg C, 2.) a) -78 deg C, 55 min, b) 0 deg C, 40 min 2: 1.) lithium diisopropylamide / 1.) THF, hexane, 0 deg C, 3 h, 2.) a) THF, -78 deg C, 2.5 h, b) from -50 deg C to -30 deg C, 45 min 3: 1.) 1 M Red-Al, 2.) 1 M aq. tetrabutylammonium dihydrogen phosphate / 1.) toluene, RT, 3 d, 2.) ethanol, reflux, 24 h View Scheme