“…Various reaction conditions are applied, including pyridine, toluene, CH 2 Cl 2 , CH 3 CN, THF, diglyme, xylene, CS 2, and dioxane as solvent, 0 °C to reflux as the reaction temperature, and in some cases in the presence of Al 2 O 3 (Table 1, entries 9-12), NaHCO 3 (Table 1, entries 18,19) and Et 3 N (Table 1, entry 28). The reaction is not preferentially carried out under inert atmosphere.…”