1: 1H-benzo[d]imidazole With sodium hydride in tetrahydrofuran; mineral oil T=0°C; 0.333333 h; Inert atmosphere; 2: benzenesulfonyl chloride in tetrahydrofuran; mineral oil T=0 - 20°C; Inert atmosphere;

triethylamine in acetone T=20°C; 4 h;

1: ethanol / 2 h / 75 - 85 °C 2: triethylamine / acetone / 4 h / 20 °C View Scheme

tetrabutylammomium bromide; caesium carbonate in toluene T=20°C; Inert atmosphereReflux;