boron trifluoride diethyl etherate; ethanethiol 1 h; Ambient temperature;

1: 86 percent / CF3COOH, Et3SiH / Ambient temperature 2: 57 percent / K2CO3, NaI / acetone / 15 h / Heating 3: 92 percent / tetrahydrofuran; ethanol; methanol / 12 h / Heating 4: 65 percent / EtSH, BF3*Et2O / 1 h / Ambient temperature View Scheme

1: 92 percent / tetrahydrofuran; ethanol; methanol / 12 h / Heating 2: 65 percent / EtSH, BF3*Et2O / 1 h / Ambient temperature View Scheme

in acetonitrile