Methanol → Methyl 5-bromo-1H-indazole-3-carboxylate

HRID 1507112Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1507112
S(=O)(=O)(O)O.[Br:6][C:7]1[CH:8]=[C:9]2[C:13](=[CH:14][CH:15]=1)[NH:12][N:11]=[C:10]2[C:16]([OH:18])=[O:17].[CH3:19]O>>[Br:6][C:7]1[CH:8]=[C:9]2[C:13](=[CH:14][CH:15]=1)[NH:12][N:11]=[C:10]2[C:16]([O:18][CH3:19])=[O:17]

Komponenten

4

Edukt 3

HCID 887MethanolHCID 1118Sulfuric AcidHCID 71573585-bromo-1H-indazole-3-carboxylic Acid

Produkt 1

HCID 12689298Methyl 5-bromo-1H-indazole-3-carboxylateAusbeute 98 %

Versuchsvorschrift

Concentrated sulfuric acid (1 mL) was added to a suspension of 5-bromo-1H-indazole-3-carboxylic acid (CXV) (1.30 g, 5.39 mmol) in dry MeOH (50 mL) and heated to reflux for 4 h under argon. The solution was cooled to room temperature and the MeOH was evaporated under vacuum. The residue was dissolved in EtOAc and washed with water. The organic phase was dried over Na2SO4, filtered and concentrated to afford methyl 5-bromo-1H-indazole-3-carboxylate (CXVI) as a white solid (1.35 g, 5.29 mmol, 98% yield). 1H NMR (DMSO-d6) δ ppm 14.13 (s, 1H), 8.21 (d, J=1.6 Hz, 1H), 7.67 (d, J=7.2 Hz, 1H), 7.59 (dd, J=7.2, 1.2 Hz, 1H), 3.92 (s, 3H); ESIMS found for C9H7BrN2O2 m/z 256.0 (M+H).

Aufarbeitung

  1. temperatureheated
  2. temperatureto reflux for 4 h under argon
  3. customthe MeOH was evaporated under vacuum
  4. dissolutionThe residue was dissolved in EtOAc
  5. washwashed with water
  6. dry with materialThe organic phase was dried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated

Quellen und Nachweise

ORD-Eintrag
ord-d712c32b6fbc4ee7a78d44a1bc99e950
Quelldatensatz
uspto-grants-2015_12
Patentnummer
US09221793B2

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