Water → 3,6-dimethyl-5-(thiophen-3-yl)-1-(3-trifluoromethylphenyl)pyrimidin-2,4(1H,3H)-dione

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Reaction Steps

To a solution of 5-iodo-3,6-dimethyl-1-(3-trifluoromethylphenyl)pyrimidin-2,4(1H,3H)-dione (prepared in Reference Example 60) (60.0 mg), 2-thiophen boronic acid (84.6 mg), sodium carbonate (84.6 mg) in tetrahydrofuran (2.0 ml)/water (0.3 ml) was added tetrakis(triphenylphosphine)palladium (25.2 mg) and the resulting mixture was stirred with heating under reflux for five hours. The reaction mixture was filtered through Celite (trade mark) and thereto was added water (10 ml), and the resulting mixture was extracted with ethyl acetate (10 ml×2). The organic layer was washed with saturated saline (20 ml), dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate) and further purified by silica gel column chromatography (eluent: chloroform/methanol) to afford 3,6-dimethyl-5-(thiophen-3-yl)-1-(3-trifluoromethylphenyl)pyrimidin-2,4(1H,3H)-dione (27.3 mg).

Provenance & Evidence