Potassium Carbonate → Diethyl 2,6-diisopropyl-4-(2-ethynylphenyl)pyridine-3,5-dicarboxylate

関与物質

反応手順

A solution of 5.68 g (11.9 mmole) of the intermediate obtained in Step B in 800 mL ethanol was treated with 2.8 g (20.3 mmole) of potassium carbonate and the reaction mixture was allowed to stir at room temperature for 16 hours. The mixture was diluted with ethyl acetate and washed with saturated aqueous solution of ammonium chloride, brine and separated. The organic layer was dried over magnesium sulfate, filtered and concentrated under reduced pressure. The crude material was purified by flash silica gel chromatography, eluting with 10 ethyl acetate/n-hexane, to give 3.95 g (9.6 mmole) of the product. 1H NMR (300 MHz, CDCl3): δ 0.90 (t, J=7.0 Hz, 6 H), 1.32 (m, 12 H), 2.97 (s, 1 H), 3.21 (septet, J=6.6, 2 H), 3.90 (q, J=7.0, 4 H), 7.2-7.6 (m, 4 H).

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