1: 94 percent / PhSH; imidazole / 1-methyl-pyrrolidin-2-one / 25 °C 2: 90 percent / BF3*Et2O / CH2Cl2 / 20 °C 3: 100 percent / K2CO3 / methanol; tetrahydrofuran / 4 h / 40 °C View Scheme

1H-imidazole; thiophenol in 1-methyl-pyrrolidin-2-one T=25°C;