Ethyl Acetate → Diethyl 2-[2-(3-methyl-4'-nitro-1,1'-biphenyl-4-yl)-2-oxoethyl]-2-(2-phenylethyl)malonate

関与物質

反応手順

To a cold suspension (0–5° C.) of 95% sodium hydride (3.53 g, 13.0 mmol) in dry tetrahydrofuran (30 mL) was slowly added diethyl 2-phenylethylmalonate (3.53 g, 13 mmol). The ice bath was removed and the reaction mixture was stirred at rt for 45 minutes. A solution of 2-bromo-1-(3-methyl-4′-nitro-1,1′-biphenyl-4-yl)ethanone (4.06 g, 12.0 mmol) in dry tetrahydrofuran (50 mL) was slowly added, and the resulting mixture was stirred at rt for about 70 h. Ethyl acetate (80 mL) and water (20 mL) were added, and the layers were separated. The organic layer was washed with water (2×30 mL), dried over magnesium sulfate, and concentrated under reduced pressure to give a dark, brown oil. This material was purified by flash chromatography (10:90 ethyl acetate/hexane) to give diethyl 2-[2-(3-methyl-4′-nitro-1,1′-biphenyl-4-yl)-2-oxoethyl]-2-(2-phenylethyl)malonate as a light yellow oil (5.30 g, 82% yield). LC-MS ret. time 4.01 min, m/z 517.9 (MH+); 1H NMR (CDCl3) δ 1.23–1.35 (m, 6H), 2.41–2.50 (m, 2H), 2.56 (s, 3H), 2.59–2.66 (m, 3.71 (s, 2H), 4.21–4.32 (m, 4H), 7.13–7.19 (m, 3H), 7.22–7.30 (m, 2H), 7.49–7.55 (m, 2H), 7.73–7.82 (m, 3H), 8.31 (d, 2H).

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