Ethanol → 5,6,7-Trifluoro-1,4-dihydro-2,3-quinoxalinedione

HRID 439513노트

반응식

HRID 439513 반응식
[F:1][C:2]1[C:3]([NH2:11])=[C:4]([NH2:10])[CH:5]=[C:6]([F:9])[C:7]=1[F:8].[C:12](O)(=[O:16])[C:13](O)=[O:14].C(O)C>Cl>[F:1][C:2]1[C:7]([F:8])=[C:6]([F:9])[CH:5]=[C:4]2[C:3]=1[NH:11][C:12](=[O:16])[C:13](=[O:14])[NH:10]2

참가 물질

5

반응물 3

HCID 702EthanolHCID 971Oxalic AcidHCID 27739583,4,5-Trifluorobenzene-1,2-diamine

생성물 1

HCID 108463705,6,7-Trifluoro-1,4-dihydro-2,3-quinoxalinedione수율 36%

시약·촉매·용매 1

HCID 313Hydrochloric Acid용매

실험 절차

To a brown solution of 3,4,5-trifluoro-1,2-phenylenediamine (285 mg, 1.75 mmol) in aqueous 2N HCl (10 mL) is added oxalic acid (221 mg, 1.75 mmol). The brown mixture is brought to reflux and stirred under N2 overnight. The mixture is filtered to yield 139 mg (37%) of crude title compound. An analytical sample is prepared by dissolving 42 mg of this brown powder in 2.5 mL boiling ethanol. Upon cooling, brown rod-like crystals were formed which are filtered and dried in vacuo to yield 15 mg (36%) of pure title compound: 1H NMR (DMSO-d6), 6.91 (m, 1H), 12.02 (s, 1H), 12.19 (s, 1H); analysis calculated for C8H3F3N2O2 : C, 44.46; H, 1.40; N, 12.96. Found: C, 44.42; H, 1.16; N, 12.76.

후처리

  1. temperatureto reflux
  2. filtrationThe mixture is filtered
  3. customto yield 139 mg (37%) of crude title compound
  4. customAn analytical sample is prepared
  5. temperatureUpon cooling
  6. custombrown rod-like crystals were formed which
  7. filtrationare filtered
  8. customdried in vacuo

출처 및 근거

ORD 기록
ord-77bc9ba18dd74687a8b2185c44b55e0c
출처 데이터셋
uspto-grants-1996_05
특허 번호
US05514680

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