Stannous Chloride → Methyl 3-amino-5-(5-methylpyridin-2-yl)benzoate

HRID 736875Notes

Reaction equation

HRID 736875 reaction equation
[CH3:1][O:2][C:3](=[O:20])[C:4]1[CH:9]=[C:8]([N+:10]([O-])=O)[CH:7]=[C:6]([C:13]2[CH:18]=[CH:17][C:16]([CH3:19])=[CH:15][N:14]=2)[CH:5]=1.Cl[Sn]Cl>CO>[CH3:1][O:2][C:3](=[O:20])[C:4]1[CH:5]=[C:6]([C:13]2[CH:18]=[CH:17][C:16]([CH3:19])=[CH:15][N:14]=2)[CH:7]=[C:8]([NH2:10])[CH:9]=1

Participants

4

Reactant 2

HCID 24479Stannous ChlorideHCID 578516583-(5-Methyl-pyridin-2-yl)-5-nitro-benzoic acid methyl ester

Product 1

HCID 57851018Methyl 3-amino-5-(5-methylpyridin-2-yl)benzoateYield 100%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of 3-(5-Methyl-pyridin-2-yl)-5-nitro-benzoic acid methyl ester (410 mg, 36.9 mmol) in methanol was added SnCl2 (1.36 g, 6.03 mmol) at room temperature. The reaction mixture was refluxed for 3 hours and then cooled. Solvent was removed in vacuo and the residue was dissolved in H2O and basified by Na2CO3 to pH=9. The mixture was extracted with CH2Cl2, and the organic phase was washed with water, brine, and dried over Na2SO4. The solvent was removed under vacuum to give 3-amino-5-(5-methyl-pyridin-2-yl)-benzoic acid methyl ester (362 m g, 100%) as yellow oil. MS (M+H)=244.

Workup

  1. temperatureThe reaction mixture was refluxed for 3 hours
  2. temperaturecooled
  3. customSolvent was removed in vacuo
  4. dissolutionthe residue was dissolved in H2O
  5. extractionThe mixture was extracted with CH2Cl2
  6. washthe organic phase was washed with water, brine
  7. dry with materialdried over Na2SO4
  8. customThe solvent was removed under vacuum

Sources & evidence

ORD record
ord-937a36449a404b4ea5dd49850a7c8535
Source dataset
uspto-grants-2009_09
Patent number
US07595405B2

Reaction notes

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