反应详情

温度

70 °C

Ethyl N-(6-chloro-2-methoxyquinoxalin-3-yl)carbamate (27 mg, 0.10 mmol) and 1-phenylpiperazine (24 mg, 0.15 mmol) were dissolved in tetrahydrofuran (2 ml) at room temperature and thereto DBU (23 mg, 0.15 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 (2:1) mixture and concentration gave 36 mg of the titled compound (yield, 91%). 1H NMR (300 MHz, CDCl3): δ 3.22-3.30 (m, 4H), 3.75-3.78 (m, 3H), 4.08-4.13 (m, 4H), 6.89-6.96 (m, 3H), 7.19-7.44 (m, 5H), 7.64-7.80 (m, 1H).

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 (2:1) mixture and concentration