n-butyllithium; diisopropylamine 1.) THF, hexane, -78 deg C, 50 min, 2.) -30 deg C, 16 h; Yield given. Multistep reaction;

N,N,N',N',N'',N''-hexamethylphosphoric triamide; lithium amide 1.) liq. NH3, from -50 deg C to -40 deg C, 0.5 h, 2.) THF, liq. NH3, a) -33 deg C, 1 h, b) RT, 4 h; Yield given. Multistep reaction;

1: 90 percent / AgBF4 / 72 h / Ambient temperature 2: 18 percent / K2CO3 / acetonitrile / 12 h / Heating View Scheme

sulfuric acid in dichloromethane 48 h;