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

HRID 1878276Notes

Reaction equation

[F:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1[F:12])[N:8]=[C:7]([O:13][CH3:14])[C:6]([NH:15][C:16](=[O:20])OCC)=[N:5]2.[CH3:21][O:22][C:23]1[CH:24]=[C:25]([N:29]2[CH2:34][CH2:33][NH:32][CH2:31][CH2:30]2)[CH:26]=[CH:27][CH:28]=1.C1CCN2C(=NCCC2)CC1>O1CCCC1>[F:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1[F:12])[N:8]=[C:7]([O:13][CH3:14])[C:6]([NH:15][C:16]([N:32]1[CH2:31][CH2:30][N:29]([C:25]3[CH:26]=[CH:27][CH:28]=[C:23]([O:22][CH3:21])[CH:24]=3)[CH2:34][CH2:33]1)=[O:20])=[N:5]2

Participants

Conditions

Temperature: 70 °C

Procedure

Ethyl N-(6,7-di fluoro-2-methoxyquinoxalin-3-yl)carbamate (25 mg, 0.088 mmol) and 1-(3-methoxy phenyl)piperazine (35 mg, 0.18 mmol) were dissolved in tetrahydrofuran (2 ml) at room temperature and thereto DBU (28 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 29 mg of the titled compound (yield, 76%). 1H NMR (300 MHz, CDCl3) δ 3.28-3.30 (m, 4H), 3.76-3.77 (m, 4H), 3.81 (s, 3H), 4.12 (s, 3H), 6.48-6.49 (m, 2H), 6.56-6.58 (m, 1H), 7.20-7.23 (m, 1H), 7.29-7.30 (m, 1H), 7.50-7.53 (m, 1H), 7.60-7.62 (m, 1H).

Workup

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

Sources & evidence

ORD record: ord-119ea4e5f50a4bdea870c25b2ed82459
Source dataset: uspto-grants-2012_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08314100B2

Reaction notes

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