Water → 1-[5-(6-Ethoxy-2-methylsulfanyl-pyrimidin-4-yl)-thiophen-2-yl]-ethanone

関与物質

反応条件

反応手順

The crude product of Preparation 27, 4-chloro-6-ethoxy-2-methylsulfanylpyrimidine, (525 mg, 2.56 mmol) was dissolved in DMF (4 mL). To this solution was added 5-acetyl-2-thiopheneboronic acid (523 mg, 3.08 mmol), PdCl2dppf (209 mg, 0.26 mmol), potassium carbonate (1.06 g, 7.69 mmol) and water (0.4 mL). The reaction mixture was heated at 80° C. under nitrogen atmosphere for overnight. The reaction mixture was cooled and poured into 30 mL of water and was then extracted with diethyl ether (20 mL×3) three times. The ether layer was separated and dried with anhydrous MgSO4 and concentrated in vacuo. The resulting crude product was purified by flash silica column chromatography (20% ethyl acetate in hexane) to give product 1-[5-(6-ethoxy-2-methylsulfanyl-pyrimidin-4-yl)-thiophen-2-yl]-ethanone (210 mg, 28% yield over two steps). 1H-NMR (CDCl3): δ 7.67 (m, 2H), 6.68 (s, 1H), 4.46 (q, J=7.1 Hz, 2H), 2.60 (s, 3H), 2.59 (s, 3H), 1.40 (t, J=7.1 Hz, 3H).

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