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

HRID 54401Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 54401
[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)-oneAusbeute 24 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 702EthanolLösungsmittel

Versuchsvorschrift

A solution of 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 r.t. 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 extract was dried over Na2SO4 and evaporated to yield 0.050 g of crude product which was purified by precipitation from ethanol:water (1:1) to give 30 mg (24%) of pure title compound as a light yellow powder; m.p. 172° C. (decomposed); 1H NMR (DMSO-d6): 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 extract was dried over Na2SO4
  6. customevaporated
  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-0bd0d027f7624027a3477c3a4e8dd95a
Quelldatensatz
uspto-grants-1997_04
Patentnummer
US05622952

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