| Summary: | A chromeno[4,3-<i>d</i>]pyrazolo[3,4-<i>b</i>]pyridinone derivative <b>3</b> bearing thieno[2,3-<i>d</i>]pyrimidine moiety, 5-methyl-1-phenyl-3-(thieno[2,3-<i>d</i>]pyrimidin-4-yl)chromeno[4,3-<i>d</i>]pyrazolo[3,4-<i>b</i>]pyridin-6(3<i>H</i>)-one, was efficiently prepared in 75% yield by the reaction of 3-phenyl-1-(thieno[2,3-<i>d</i>]pyrimidin-4-yl)-1<i>H</i>-pyrazol-5-amine <b>1</b> with 3-acetyl-2<i>H</i>-chromen-2-one <b>2</b> in the presence of FeCl<sub>3</sub>-SiO<sub>2</sub> as a catalyst in refluxing ethanol for 6 h. The structure of the new synthesized compound was characterized by <sup>1</sup>H-, <sup>13</sup>C- NMR, IR spectroscopy, mass-spectrometry, and elemental analysis.
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