反应详情

温度

70 °C

Ethyl N-(2,6,7-trimethoxyquinoxalin-3-yl)carbamate (28 mg, 0.091 mmol) and 1-(3-methoxy phenyl) piperazine (27 mg, 0.18 mmol) were dissolved in tetrahydrofuran (2 ml) at room temperature and thereto DBU (27 mg, 0.18 mmol) was added. The resulting mixture was stirred at 70° C. for 7 hours and concentrated under the reduced pressure to remove the solvent, and purified by SiO2 column chromatography. Extraction of the residue with a n-hexane:ethyl acetate (1:2) mixture and concentration gave 26 mg of the titled compound (yield, 64%). 1H NMR (300 MHz, CDCl3) δ 3.27-3.29 (m, 4H), 3.78-3.81 (m, 7H), 3.94 (s, 3H), 3.97-3.98 (m, 1H), 4.00 (s, 3H), 4.15 (s, 3H), 6.47-6.49 (m, 2H), 6.56-6.58 (m, 1H), 7.11 (s, 1H), 7.14-7.27 (m, 3H).

1. concentrationconcentrated under the reduced pressure
2. customto remove the solvent
3. custompurified by SiO2 column chromatography
4. extractionExtraction of the residue
5. concentrationwith a n-hexane:ethyl acetate (1:2) mixture and concentration