We first examined the reaction in different solvents including acetonitrile, ethanol, dioxane, toluene and solvent-free at 100 C. The best results were obtained under solvent-free conditions (entry 5).
We first examined the reaction in different solvents includingacetonitrile, ethanol, dioxane, toluene and solvent-free at 100 C.The best results were obtained under solvent-free conditions(entry 5).