Acetic Anhydride → HCID 178474341, compound

HRID 1625059Notes

Reaction equation

HRID 1625059 reaction equation
[NH:1]1[CH:5]=[CH:4][C:3]([NH2:6])=[N:2]1.C([O-])(O)=O.[Na+].[C:12](OC(=O)C)(=[O:14])[CH3:13]>O>[NH:1]1[CH:5]=[CH:4][C:3]([NH:6][C:12](=[O:14])[CH3:13])=[N:2]1

Participants

5

Reactant 3

HCID 7918Acetic AnhydrideHCID 516892Sodium BicarbonateHCID 178418806HCID 178418806, compound

Product 1

HCID 178474341HCID 178474341, compoundYield 49%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

1H-pyrazol-3-amine (ALDRICH, 11.32 g, 0.136 mol) was dissolved in 100 mL of distilled water. NaHCO3 (34 g, 0.408 mol) was slowly added. Acetic anhydride was then added dropwise and the resulting suspension was heated at reflux overnight. Then, the mixture was allowed to cool down to room temperature and the solid obtained was filtered off and characterized as the title compound (8.4 g, 0.067 mol, 49% yield). After concentration of the filtrate, a second precipitate was obtained (2.7 g, 0.021 mol, 16% yield), also characterized as the title compound. 1H NMR (300 MHz, DMSO-d6) δ ppm: 12.23 (br s, 1H), 10.30 (br s, 1H), 7.55 (br s, 1H), 6.45 (br s, 1H), 1.97 (s, 3H). [ES+MS] m/z 126 (MH+).

Workup

  1. temperaturethe resulting suspension was heated
  2. temperatureat reflux overnight
  3. customthe solid obtained
  4. filtrationwas filtered off

Sources & evidence

ORD record
ord-daca43609ab7447b8fce4f8b7a26a85f
Source dataset
uspto-grants-2014_07
Patent number
US08779153B2

Reaction notes

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