4-Oxo-(4H)-1-benzopyran-3-carboxaldehydes are condensed with 3-methyl-1-phenyl pyrazolin-5-(4H)-one under microwave activation to afford different 3-methyl-4-[(chromon-3-yl)- methylene]-1-phenyl pyrazolin-5-(4H)-ones (1–13) with alumina support and in solvent free conditions. The structures of the synthesized compounds have been established on the basis of their spectral data.
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Karale et al. (2002) studied this question.
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