Ammonium formate → Methyl 3-amino-5-fluoro-4-methylbenzoate

HRID 2070760Notes

Reaction equation

HRID 2070760 reaction equation
[CH3:1][O:2][C:3](=[O:16])[C:4]1[CH:9]=[C:8]([F:10])[C:7]([CH3:11])=[C:6]([N+:12]([O-])=O)[C:5]=1Cl.C([O-])=O.[NH4+]>C(O)C.[Pd]>[CH3:1][O:2][C:3](=[O:16])[C:4]1[CH:9]=[C:8]([F:10])[C:7]([CH3:11])=[C:6]([NH2:12])[CH:5]=1

Participants

5

Reactant 2

HCID 2723923Ammonium formateHCID 866615862-Chloro-5-fluoro-4-methyl-3-nitro-benzoic acid methyl ester

Product 1

HCID 47002571Methyl 3-amino-5-fluoro-4-methylbenzoateYield 88.5%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 702EthanolSolvent

Conditions

Temperature
75 °C

Procedure

2-Chloro-5-fluoro-4-methyl-3-nitro-benzoic acid methyl ester (Example 252d, 53 g), 5% Pd/C (9 g) and ammonium formate (80 g) were stirred together in ethanol (500 mL) at 75° C. for 32 h. The reaction was filtered through celite and filtrate evaporated to a solid. This solid residue was dissolved in dichloromethane, washed with water. The separated aqueous layer was further extracted with dichloromethane (3×100 mL) and the combined organics dried (MgSO4) and evaporated. Analysis showed significant unreacted starting material. The reaction was repeated by new 5% P/C (9 g) and ammonium formate (80 g) together in ethanol (500 mL) and heating at 75° C. for 20 h. Further 5% Pd/C (9 g) and ammonium formate (80 g) were added and heating continued for 10 h. The mixture was is filtered through celite and the filter cake was washed with further ethanol. The combined filtrates were evaporated, the residue dissolved in dichloromethane, washed with water. The separated aqueous layer was further extracted with dichloromethane (3×100 mL) and the combined organics dried (MgSO4) and evaporated to afford the subtitle compound (34.7 g).

Workup

  1. filtrationThe reaction was filtered through celite and filtrate
  2. customevaporated to a solid
  3. dissolutionThis solid residue was dissolved in dichloromethane
  4. washwashed with water
  5. extractionThe separated aqueous layer was further extracted with dichloromethane (3×100 mL)
  6. dry with materialthe combined organics dried (MgSO4)
  7. customevaporated
  8. additionFurther 5% Pd/C (9 g) and ammonium formate (80 g) were added
  9. temperatureheating
  10. filtrationThe mixture was is filtered through celite
  11. washthe filter cake was washed with further ethanol
  12. customThe combined filtrates were evaporated
  13. dissolutionthe residue dissolved in dichloromethane
  14. washwashed with water
  15. extractionThe separated aqueous layer was further extracted with dichloromethane (3×100 mL)
  16. dry with materialthe combined organics dried (MgSO4)
  17. customevaporated

Sources & evidence

ORD record
ord-9bb4b71a8fb3427ca65a6be02bb29c0d
Source dataset
uspto-grants-2012_10
Patent number
US08299246B2

Reaction notes

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