1,8-Diazabicyclo(5.4.0)undec-7-ene → 1-[(6,7-Dichloro-2-methoxyquinoxalin-3-yl)aminocarbonyl]-4-(3-methoxyphenyl)piperazine

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Ethyl N-(6,7-dichloro-2-methoxyquinoxalin-3-yl)carbamate (28 mg, 0.089 mmol) and 1-(3-methoxy phenyl)piperazine (35 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 (1:1) mixture and concentration gave 27 mg of the titled compound (yield, 66%). 1H NMR (300 MHz, CDCl3) δ 3.28-3.30 (m, 4H), 3.74-3.76 (m, 4H), 3.81 (s, 3H), 4.19 (s, 3H), 6.47-6.49 (m, 3H), 6.53-6.57 (m, 1H), 7.30 (br s, 1H), 7.85 (s, 1H), 7.92 (s, 1H).

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