Me2S(SMe)BF4 in acetonitrile 20 h; Ambient temperature;

1: 1.) sec-BuLi, Tetramethylethylenediamine / 1.) THF, a) 1h, -78 deg C, b) 1 h 40 deg C, 2.) THF, a) 0.5 h, -78 degC, b) 2 h to 0 deg C 2: 66 percent / 10percent HBF4 / tetrahydrofuran / Ambient temperature 3: 9 percent / Dimethyl(methylthio)sulfonium fluoroborate / acetonitrile / 20 h / Ambient temperature View Scheme

1: 66 percent / 10percent HBF4 / tetrahydrofuran / Ambient temperature 2: 9 percent / Dimethyl(methylthio)sulfonium fluoroborate / acetonitrile / 20 h / Ambient temperature View Scheme