Barium Hydroxyapatite Ba10(PO4)6(OH)2 and Barium Nitrate: New Recyclable Catalysts for the Synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones

In this paper, we report an efficient synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones (DHPMs) from the Biginelli condensation reaction of ethyl acetoacetate, aromatic aldehydes and urea or thiourea catalysed by barium (II) nitrate and barium hydroxyapatite Ba10(PO4)6(OH)2 (BaHAp). These new catalysts exhibited an important reactivity and proved reusable