Phthalimide-N-sulfonic acid as a recyclable organocatalyst for an efficient and eco-friendly synthesis of 2-(2-oxo-2H-chromen-3-yl)-4-aryl-indeno[1,2-b]pyridine-5-one derivatives
Keywords: 2-(2-Oxo-2H-chromen-3-yl)-4-aryl-indeno[1,2-b]pyridine-5-one; Phthalimide-N-sulfonic acid; 1,3-Indandione; 3-Acetylcoumarin;