反应详情

温度

0 °C

To a solution of α-bromo-2′-acetonaphthone (386.2 g, 1.57 mol) in dichloromethane (2.5 L) at 0° C. was added Compound 3 (249.1 g, 1.65 mol) in 30 min, followed by the addition of triethylamine (220.7 mL, 1.57 mmol) in 45 min. After stirring at 0° C. for 40 min, the reaction mixture was warmed to room temperature and stirred overnight. The reaction solution was then washed with water (2×) and the aqueous layer was re-extracted with dichloromethane (2×). The combined organic extract was dried over sodium sulfate and concentrated in vacuo. The ketone, Compound 4, was obtained as a reddish oil (513.3 g, quantitative), was used in the next step without further purification: 1H NMR (CDCl3, 500 MHz) δ 8.50 (s, 1H), 8.01 (d, J=8.5 Hz, 1H), 7.92 (d, 8.0 Hz, 1H), 7.88-7.85 (m, 2H), 7.60-7.54 (m, 2H), 7.26-7.23 (m, 1H), 6.97-6.94 (m, 2H), 6.82 (dd, J=8.0, 2.5 Hz, 1H), 3.88 (s, 2H), 3.75 (s, 3H), 3.69 (s, 2H), 2.42 (s, 3H); ESI MS m/z 320 [M+H]+.

1. temperaturethe reaction mixture was warmed to room temperature
2. stirringstirred overnight
3. washThe reaction solution was then washed with water (2×)
4. extractionthe aqueous layer was re-extracted with dichloromethane (2×)
5. extractionThe combined organic extract
6. dry with materialwas dried over sodium sulfate
7. concentrationconcentrated in vacuo