反应详情

温度

90 °C

A mixture of 2-benzyl-4-bromoisoquinolin-1(2H)-one (0.377 g, 1.20 mmol), 2-(3,4-dimethoxyphenyl)-4,4,5,5-tetramethyl-1,3-dioxolane (0.380 g, 1.44 mmol) and Na2CO3 (0.382 g, 3.60 mmol) was degassed under nitrogen. Toluene (20 mL), ethanol (20 mL) and water (2 mL) were then added. The reaction mixture was degassed again and Pd(PPh3)4 (0.139 g, 0.12 mmol) was added. The reaction was stirred at 90° C. for 16 h under nitrogen. After that time, the mixture was cooled to rt and concentrated under reduced pressure. The residue was diluted with water (50 mL) and extracted with ethyl acetate (2×100 mL). The organic phase was washed with water, brine, dried over Na2SO4 and concentrated under reduced pressure. The product was purified by flash column chromatography (silica gel, 70:30 hexanes/ethyl acetate to 60:40 hexanes/ethyl acetate) to give 2-benzyl-4-(3,4-dimethoxyphenyl)isoquinolin-1(2H)-one (0.385 g, 86%) as a pale yellow solid: mp 174-176° C.; 1H NMR (400 MHz, CDCl3): δ 8.57 (d, J=7.81 Hz, 1H), 7.47-7.66 (m, 3H), 7.24-7.42 (m, 5H), 7.06 (s, 1H), 6.85-6.98 (m, 3H), 5.27 (s, 2H), 3.93 (s, 3H), 3.87 (s, 3H). ESI MS m/z 372 [M+H]+.

1. customwas degassed under nitrogen
2. additionToluene (20 mL), ethanol (20 mL) and water (2 mL) were then added
3. customThe reaction mixture was degassed again
4. temperatureAfter that time, the mixture was cooled to rt
5. concentrationconcentrated under reduced pressure
6. additionThe residue was diluted with water (50 mL)
7. extractionextracted with ethyl acetate (2×100 mL)
8. washThe organic phase was washed with water, brine
9. dry with materialdried over Na2SO4
10. concentrationconcentrated under reduced pressure
11. customThe product was purified by flash column chromatography (silica gel, 70:30 hexanes/ethyl acetate to 60:40 hexanes/ethyl acetate)