Ca(IO3)2 nanoparticles: fabrication and application as an eco-friendly and recyclable catalyst for the green synthesis of quinoxalines, pyridopyrazines, and 2,3-dicyano pyrazines

In this paper, calcium iodate nanoparticles were first synthesized by the modified reaction of Ca(NO3)2 and KIO3 in an aqueous medium under ultrasonic irradiation. The structure nanocatalyst was then characterized FT-IR, FESEM, EDX, XRD, BET techniques. Afterward, fabricated Ca(IO3)2 applied as a facile synthesis heterocycles including quinoxalines, 5,6-dicyano pyrazines, pyrido[2,3-b]pyrazines. For purpose, feasibility presence different catalyst amounts, solvents, temperatures investigated. Next, target compounds obtained condensation aryl-1,2-diamines or 2,3-diaminomaleonitrile with 1,2-diketones catalytic amount ethanol acetic acid solvents at ambient temperature good to excellent yields. One salient advantages work is chemical precipitation method its application heterogeneous for time organic compounds. other important benefits process are use inexpensive, safe, stable recyclable catalyst, high product yields, short times, easy isolation pure form.