A simple and green protocol for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones using 11-molybdo-1-vanado phosphoric acid as a catalyst under ultrasound irradiation

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Abstract

A one-pot three-component reaction of ethyl acetoacetate, aldehydes and urea has efficiently been carried out in the presence of 11-molybdo-1-vanadophosphoric acid in ethanol at room temperature under ultrasound irradiation to form the corresponding 3,4-dihydropyrimidin 2(1H)-ones in high yields. The 11-molybdo-1-vanadophosphoric acid (H4PMo11V1O40) was prepared and characterized by FT-IR spectroscopy, TG-DTA analysis and XRD analysis techniques. The presence of Keggin structure and incorporation of vanadium into the Keggin structure of synthesized H4PMo11V1O40 catalyst was confirmed by FT-IR and powder XRD analysis techniques. TG-DTA analysis results indicated that H4PMo11V1O40 catalyst was thermally stable up to the temperature 434 °C. The present catalytic system is recyclable and can be reused without greater loss of reactivity.

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Chavan, L. D., Deshmukh, S. N., & Shankarwar, S. G. (2019). A simple and green protocol for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones using 11-molybdo-1-vanado phosphoric acid as a catalyst under ultrasound irradiation. Orbital, 11(5), 314–320. https://doi.org/10.17807/orbital.v11i5.1423

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