反应详情

To a solution of ethyl 2-(6-methyl-3-pyridyloxy)-2-methylpropionate (Step A, 2.0 g, 8.9 mmol) in DMSO (20 mL) was added potasium hydroxide (1.0 g, 20 mmol) in 2 mL water. After stirring at room temperature for 2 h, the reaction was quenched by addition of formic acid (85%, 10 mmol) and poured into water (200 mL). The product was extracted with EtOAc (2×100 mL), and the combined extracts were dried over anhydrous sodium sulfate, filtered and concentrated to dryness to give the title compound contaminated with DMSO (molar ratio 1:5, determined by NMR). 1H NMR (500 MHz, CD3OD): δ 8.06 (d, 1H), 7.38-7.22 (m, 2H), 2.47 (s, 3H), 1.58 (s, 6H).

1. extractionThe product was extracted with EtOAc (2×100 mL)
2. dry with materialthe combined extracts were dried over anhydrous sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated to dryness