An efficient and practical synthesis of 2-((1H-indol-3-yl)(aryl)methyl)malononitriles under ultrasound irradiation

Synthesis of 2-((1H-indol-3-yl)(aryl)methyl)malononitrile via the Michael addition of indole with various arylmethylenemalononitriles was carried out in good yields using anhydrous zinc chloride as the catalyst under ultrasound irradiation.