Melamine trisulfonic acid: A new, efficient and recyclable catalyst for the synthesis of 3,4-dihydro

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Melamine trisulfonic acid (MTSA) can be used as an efficient and recyclable catalyst for the promotion of the synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones (DHPMs) in the absence of solvent. All reactions were performed at 80 ℃ in good to high yields.
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