Stannous chloride dihydrate → 7-bromo-6-fluoro-3,4-dihydroquinoxalin-2(1H)-one

HRID 1857399Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1857399
[Br:1][C:2]1[C:7]([F:8])=[CH:6][C:5]([NH:9][CH2:10][C:11](O)=[O:12])=[C:4]([N+:14]([O-])=O)[CH:3]=1.BrC1C=C([N+]([O-])=O)C(F)=CC=1NCC(O)=O.O.O.[Sn](Cl)Cl>C(O)C>[Br:1][C:2]1[CH:3]=[C:4]2[C:5]([NH:9][CH2:10][C:11](=[O:12])[NH:14]2)=[CH:6][C:7]=1[F:8]

Komponenten

5

Edukt 3

HCID 61436Stannous chloride dihydrateHCID 100857532-[(4-Bromo-5-fluoro-2-nitrophenyl)amino]acetic AcidHCID 10469611N-(2-Bromo-5-fluoro-4-nitrophenyl)glycine

Produkt 1

HCID 100374907-bromo-6-fluoro-3,4-dihydroquinoxalin-2(1H)-one

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 702EthanolLösungsmittel

Versuchsvorschrift

A solution of a mixture of N-(4'-bromo-5'-fluoro-2'-nitrophenyl)glycine and N-(2'-bromo-5'-fluoro-4'-nitrophenyl)glycine (0.150 g, 0.512 mmol, as prepared above) and tin (II) chloride dihydrate (0.346 g, 1.53 mmol, Aldrich, used as received) in ethanol (3.0 mL) was refluxed for 30 min. It was then cooled to room temperature and the solvent was removed under vacuum. The residue was diluted, with water (10 mL) and basified with saturated NaHCO3 (3.0 mL) to pH~8. The resulting white suspension was extracted with ethyl acetate (30 mL). The ethyl acetate was dried over anhydrous Na2SO4 and removed under vacuum to yield 0.050 g of crude product, which was purified by precipitation from ethanol:water (1:1) to give 30 mg (24%) of the pure (1H NMR) title compound as a light yellow powder; m.p. 172° C. (decomposed); 1H NMR (DMSO-d6): δ 3.73 (s, 2H), 6.37 (s, 1H), 6.551 (d, 1H, J=10.2 Hz), 6.825 (d, 1H, J=6.6 Hz), 10.303 (s, 1H).

Aufarbeitung

  1. temperaturewas refluxed for 30 min
  2. customthe solvent was removed under vacuum
  3. additionThe residue was diluted, with water (10 mL)
  4. extractionThe resulting white suspension was extracted with ethyl acetate (30 mL)
  5. dry with materialThe ethyl acetate was dried over anhydrous Na2SO4
  6. customremoved under vacuum
  7. customto yield 0.050 g of crude product, which
  8. customwas purified by precipitation from ethanol:water (1:1)

Quellen und Nachweise

ORD-Eintrag
ord-9a329c960a7f43f4a3df64c14106cbfc
Quelldatensatz
uspto-grants-2000_11
Patentnummer
US06147075

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