A novel series of chromone analogs were synthesized and evaluated for their inhibitory activity against interleukin-5. Among them compounds 5-Cyclohexylmethoxy-3-(4- hydroxybenzyl)-4H-chromen-4-one (6a, 98% inhibition at 30 μM, IC50< 3.0 μM) and 5- Cyclohyxylmethoxy-3-(hydroxymethyl)-4H-chromen-4-one (8a, 84% inhibition at 30 μM, IC50= 7.6 μM) showed most potent activity. The structural requirement of chromone ...