The condensation of 4-oxo-4H-1-benzopyran-3-carbaldehydes with 3-methyl-1-phenylpyrazolin-5-(4H)-ones in dioxane to afford 3-methyl-4-[(chromon-3-yl)methylene]-1-phenylpyrazolin-5-(4H)-ones was performed using MCM-41-SO3H as a catalyst.
Synthesis of 3-methyl-4-[(chromon-3-yl)methylene]-1-phenylpyrazolin-5-(4H)-ones catalysed by MCM-41-SO3H
R. V. Hangarge, S. A. Siddiqui, S. Shengule and M. S. Shingare, Mendeleev Commun., 2002, 12, 209 DOI: 10.1070/MC2002v012n05ABEH001611
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