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ChemInform Abstract: p-Sulfonic Acid Calixarenes as Efficient and Reusable Organocatalysts for the Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones/-thiones.

✍ Scribed by Daniel L. da Silva; Sergio A. Fernandes; Adao A. Sabino; Angelo de Fatima


Publisher
John Wiley and Sons
Year
2012
Weight
28 KB
Volume
43
Category
Article
ISSN
0931-7597

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## Abstract magnified image A simple and highly efficient procedure for the Biginelli condensation reaction of aldehydes, β‐ketoesters, urea, or thiourea catalyzed by Ceric ammonium nitrate (CAN) as a Lewis‐acid at ambient temperature is described. The procedure proved to be simple and of high yiel