1: 1.) trimethylchlorosilane, hexamethyldisilazane, 2.) trimethylsilyl triflate / 1.) reflux, 3 h, 2.) CHCl3, RT, 1 h 2: triphenylphosphine, CCl4, pyridine / dimethylformamide / Ambient temperature 3: 1N NaOEt / ethanol / 0.17 h / Ambient temperature View Scheme

1: 1.) trimethylchlorosilane, hexamethyldisilazane, 2.) trimethylsilyl triflate / 1.) reflux, 3 h, 2.) CHCl3, RT, 1 h 2: triphenylphosphine, CCl4, pyridine / dimethylformamide / Ambient temperature 3: 1N NaOEt / ethanol / 0.17 h / Ambient temperature View Scheme

1: triphenylphosphine, CCl4, pyridine / dimethylformamide / Ambient temperature 2: 1N NaOEt / ethanol / 0.17 h / Ambient temperature View Scheme