2-Fluoro-5-nitrobenzoic acid Chemical Properties

Melting point:

142-144 °C (lit.)

Boiling point:

337.7±27.0 °C(Predicted)

Density 

1.568±0.06 g/cm3(Predicted)

storage temp. 

Keep in dark place,Sealed in dry,Room Temperature

solubility 

Soluble in chloroform, ethanol.

pka

2.54±0.10(Predicted)

form 

Crystalline Powder

color 

White to pale yellow

BRN 

1912835

InChI

InChI=1S/C7H4FNO4/c8-6-2-1-4(9(12)13)3-5(6)7(10)11/h1-3H,(H,10,11)

InChIKey

ICXSHFWYCHJILC-UHFFFAOYSA-N

SMILES

C(O)(=O)C1=CC([N+]([O-])=O)=CC=C1F

CAS DataBase Reference

7304-32-7(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

HazardClass 

IRRITANT

HS Code 

29163990

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

2-Fluoro-5-nitrobenzoic acid Usage And Synthesis

Chemical Properties

white to light yellow crystal powder

Uses

2-Fluoro-5-nitrobenzoic acid may be used in the synthesis of dibenz[b,f]oxazepin-11(10H)-ones, via the nucleophilic aromatic substitution (SNAr) of fluorine in 2-fluoro-5-nitrobenzoic acid with the OH of various 2-aminophenols on solid support, synthesis of substituted dibenzazocines on solid support, via SNAr of fluorine in 2-fluoro-5-nitrobenzoic acid with the OH function of the immobilized polysubstituted phenols, in the synthesis of oxazepines.

Uses

2-Fluoro-5-nitrobenzoic acid may be used in the synthesis of:

• dibenz[b,f]oxazepin-11(10H)-ones, via the nucleophilic aromatic substitution (S_NAr) of fluorine in 2-fluoro-5-nitrobenzoic acid with the OH of various 2-aminophenols on solid support
• synthesis of substituted dibenzazocines on solid support, via S_NAr of fluorine in 2-fluoro-5-nitrobenzoic acid with the OH function of the immobilized polysubstituted phenols
• in the synthesis of oxazepines

General Description

2-Fluoro-5-nitrobenzoic acid is reported to react with an aldehyde, isonitrile and a primary amine tethered to a Boc-protected internal amino or hydroxyl nucleophile, to afford the Ugi product.

Synthesis

General procedure for the synthesis of 2-fluoro-5-nitrobenzoic acid from o-fluorobenzoic acid: Nitric acid (60% solution, 5.0 mL) was slowly added dropwise to pre-cooled concentrated sulfuric acid (5.0 mL), and the reaction temperature was controlled to not exceed 10 °C. Subsequently, o-fluorobenzoic acid (2.1 g, 15.0 mmol) was added in batches and the reaction temperature was maintained between 15 and 25 °C. The reaction mixture was stirred at room temperature for 2 hours. After completion of the reaction, the reaction was quenched by addition of ice water and the precipitate was collected by filtration. The product was dried at room temperature to give the intermediate 2-fluoro-5-nitrobenzoic acid as a white powder. Yield: 93%; Melting point: 135-137 °C; 1H NMR (300 MHz, DMSO-d6): δ=7.32 (t, 1H, H3, 3JH3_H4=JH3-F=9.2 Hz), 8.43 (dt, 1H, H4, 3JH4_H3=9.2 Hz, 4JH4_F=4JH4_H6=3.5 Hz), 8.89 (dd, 1H, H6, 4JH6_F=5.8 Hz, 4JH6_H4=3.0 Hz); 13C NMR (75 MHz, DMSO-d6): δ=118.7 (d, C1, 2JC-F=10.9 Hz), 118.7 (d, C3, 2JC-F=25.0 Hz), 128.9 (d, C6, 3JC -F=2.2 Hz), 130.6 (d, C4, 3JC-F=10.9 Hz), 143.9 (C5), 165.7 (d, C2, 1JC-F=272.0 Hz), 166.7 (d, COOH, 3JC-F=3.8 Hz).

References

[1] Patent: WO2012/85003, 2012, A1. Location in patent: Page/Page column 83
[2] Journal of Organic Chemistry, 2008, vol. 73, # 2, p. 538 - 549
[3] Journal of Heterocyclic Chemistry, 1998, vol. 35, # 6, p. 1301 - 1304
[4] Journal of Medicinal Chemistry, 2003, vol. 46, # 10, p. 1905 - 1917
[5] Australian Journal of Chemistry, 1981, vol. 34, # 5, p. 969 - 979

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