Pyrazole → HCID 178515693, compound

Participants

Reaction Steps

To an eggplant type flask (20 ml), 3-iodochromone (136 mg) prepared in Example 1, pyrazole (136 mg), potassium carbonate (1382 mg), and dimethylformamide (15 ml) were added and the mixture was reacted at 80° C. for 20 hours with stirring. The reaction mixture was added to ice water and extracted with chloroform. The organic layer was separated, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purifiedby the silica gel column chromatography, and the purified compound was recrystallized from benzene/hexane to give the titled compound (75.1 mg; yield=70.8%) as white needle crystals. Melting point: 143°-144° C. 1 H-NMR(CDCl3, δ ppm): 6.90 (s, H3), 8.24 (dd, H5), 7.46-7.58 (m, H6), 7.76 (t, H7), 7.46-7.58 (m ,H8), 7.85 (d, H3'), 6.59 (dd, H4'), 8.23 (d, H5').

Provenance & Evidence