sodium ethanolate in ethanol Ambient temperature;

1: 1.) trimethylchlorosilane, hexamethyldisilazane, 2.) trimethylsilyl triflate / 1.) reflux, 3 h, 2.) CHCl3, RT, 1 h 2: 83 percent / 1N NaOEt / ethanol / Ambient temperature View Scheme

1: 1.) trimethylchlorosilane, hexamethyldisilazane, 2.) trimethylsilyl triflate / 1.) reflux, 3 h, 2.) CHCl3, RT, 1 h 2: 83 percent / 1N NaOEt / ethanol / Ambient temperature View Scheme

1: 1.) triphenylphosphine, 2.) carbon tetrachloride, pyridine / 1.) DMF, 10 min, 2.) DMF, RT, 1.5 h 2: 1.) trimethylchlorosilane, hexamethyldisilazane, 2.) trimethylsilyl triflate / 1.) reflux, 3 h, 2.) CHCl3, RT, 1 h 3: 83 percent / 1N NaOEt / ethanol / Ambient temperature View Scheme

pyridine; tetrachloromethane; triphenylphosphine 1.) DMF, 10 min, 2.) DMF, RT, 1.5 h; Multistep reaction;