Potassium Nitrate → 5-Bromo-6-nitro-7-fluoro-1,4-dihydro-2,3-quinoxalinedione

HRID 439465Notes

Reaction equation

[Br:1][C:2]1[CH:11]=[C:10]([F:12])[CH:9]=[C:8]2[C:3]=1[NH:4][C:5](=[O:14])[C:6](=[O:13])[NH:7]2.[N+:15]([O-])([O-:17])=[O:16].[K+]>OS(O)(=O)=O>[Br:1][C:2]1[C:11]([N+:15]([O-:17])=[O:16])=[C:10]([F:12])[CH:9]=[C:8]2[C:3]=1[NH:4][C:5](=[O:14])[C:6](=[O:13])[NH:7]2

Participants

Conditions

Temperature: 0 °C

Procedure

The method of Cheeseman, supra. was adapted. 5-Bromo-7-fluoro-1,4-dihydroquinoxaline-2,3-dione (77 mg, 0.30 mMol) was dissolved in concentrated H2SO4 (1 mL) at 0° C. for 30 min, and KNO3 (35 mg, 0.346 mMol, Baker) was added to this solution. The mixture was stirred at 0° C. for 3 h and then at room temperature for 30 h. The mixture was poured into ice water (10 g) and the precipitate was collected by filtration. The precipitate was dissolved in 1N NaOH (10 mL), then was acidified to pH=2 with 4N HCl to give cream precipitate, which was collected by filtration, and was dried in the air at 50° C. for 4 h affording pure (by NMR) 5-bromo-6-nitro-7-fluoro-1,4-dihydro-2,3-quinoxalinedione (81 mg, 90%), as a white amorphous solid; mp: 320°-25° C. (dec. from 290° C.). IR (KBr, cm-1): 3416, 3071, 2952, 1721, 1609, 1546. NMR (1H, DMSO-d6): δ7.146 (d, J=10.2 Hz, 1H), 11.432 (s, 1H), 12.340 (s, 1H). HRMS: calcd. for C8H3N3O4BrF (M+) m/z: 302.9290, found: 302.9290.

Workup

waitat room temperature for 30 h
filtrationthe precipitate was collected by filtration
dissolutionThe precipitate was dissolved in 1N NaOH (10 mL)
customto give cream precipitate, which
filtrationwas collected by filtration
customwas dried in the air at 50° C. for 4 h

Sources & evidence

ORD record: ord-31abc5c0b6764253905a2480b0af7808
Source dataset: uspto-grants-1996_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05514680

Reaction notes

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