Stannous chloride dihydrate → 6-Amino-7-chloro-1,4-dihydro-2,3-quinoxalinedione

HRID 54344Notes

Reaction equation

[N+:1]([C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][C:13]=1[Cl:14])[NH:10][C:9](=[O:15])[C:8](=[O:16])[NH:7]2)([O-])=O.O.O.Cl[Sn]Cl>C(O)C>[NH2:1][C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][C:13]=1[Cl:14])[NH:10][C:9](=[O:15])[C:8](=[O:16])[NH:7]2

Participants

Conditions

Temperature: 90 °C

Procedure

To a stirred mixture of 6-nitro-7-chloro-1,4-dihydro-2,3-quinoxalinedione (35 mg, 0.145 mMol) in ethanol (2 mL) was added SnCl2.2H2O (163 mg, 0.724 mMol) in one portion. The mixture was refluxed at 80° C. (oil bath 90° C.) with stirring for 0.5 h to form a clear solution and continually refluxed for another 0.5 h. It was then cooled to room temperature and the yellow precipitate was collected by filtration, followed by washing with cold ethanol (1×1 mL) to give 25 mg (82%) of crude title compound (contains minor impurities by NMR). Crystallization from DMSO/H2O gave 14 mg of pure title compound as bright yellow needles, mp: >350° C. (dec. from 335° C.). IR (KBr, cm-1): 3406, 3356, 3212, 1668, 1637, 1518, 1437. NMR (1H, DMSO-d6): d 5.306 (s, 2H); 6.551 (s, 1H); 6.940 (s, 1H); 11.606 (s, 1H); 11.788 (s, 1H). HRMS: calcd for C8H6N3O2Cl (M+) m/z: 211.0147; found 211.0159. Potency relative to DCK: 28.0%.

Workup

customto form a clear solution
temperaturecontinually refluxed for another 0.5 h
temperatureIt was then cooled to room temperature
filtrationthe yellow precipitate was collected by filtration
washby washing with cold ethanol (1×1 mL)
customto give 25 mg (82%) of crude title compound (contains minor impurities by NMR)
customCrystallization from DMSO/H2O

Sources & evidence

ORD record: ord-2237ac09ce894ccf93116907f21205f0
Source dataset: uspto-grants-1997_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05622952

Reaction notes

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