Abstract
A facile and environmentally benign protocol has been developed for the one-pot three-component synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones from the cyclocondensation reaction of aldehyde, ethyl acetoacetate (β-dicarbonyl compound) and urea or thiourea using polyvinylsulfonic acid as a reusable homogeneous Brønsted acid- and metal-free organocatalyst in water and ethanol. This new protocol has the advantages of easy availability, stability, reusability and eco-friendly of the catalyst, high to excellent yields, simple experimental and work-up procedure.
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Rahmatpour, A. Polyvinylsulfonic Acid: An Efficient, Water-Soluble and Reusable Brønsted Acid Catalyst for the Three-Component Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones/thiones in Water and Ethanol. Catal Lett 142, 1505–1511 (2012). https://doi.org/10.1007/s10562-012-0873-6
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DOI: https://doi.org/10.1007/s10562-012-0873-6