Formic Acid → Methyl 7-fluoro-6-(phenylamino)-1H-benzo[d]imidazole-5-carboxylate

HRID 1895419Notes

Reaction equation

HRID 1895419 reaction equation
[CH3:1][O:2][C:3](=[O:22])[C:4]1[CH:9]=[C:8]([N+:10]([O-])=O)[C:7]([NH2:13])=[C:6]([F:14])[C:5]=1[NH:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.[CH:23](O)=O>C(O)C.[OH-].[OH-].[Pd+2]>[CH3:1][O:2][C:3]([C:4]1[C:5]([NH:15][C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)=[C:6]([F:14])[C:7]2[N:13]=[CH:23][NH:10][C:8]=2[CH:9]=1)=[O:22]

Participants

5

Reactant 2

HCID 284Formic AcidHCID 44122658Methyl 4-amino-3-fluoro-5-nitro-2-(phenylamino)benzoate

Product 1

HCID 11818480Methyl 7-fluoro-6-(phenylamino)-1H-benzo[d]imidazole-5-carboxylateYield 86.3%

Reagents, catalysts & solvents 2

HCID 9942167Palladium hydroxideCatalystHCID 702EthanolSolvent

Procedure

4-Amino-3-fluoro-5-nitro-2-phenylamino-benzoic acid methyl ester 26a (16.70 g, 54.71 mmol), formic acid (250 mL, 6.63 mol) and 20% Pd(OH)2/C (9.00 g, 16.91 mmol) in ethanol (250 mL) are stirred at 40° C. for two hours under N2 and then at 95° C. for 16 hours. The reaction mixture is cooled to room temperature and filtered through Celite rinsing with ethyl acetate. The filtrate is concentrated under reduced pressure to give a yellow solid. The solid is triturated with diethyl ether to give 13.47 g (86%) of the desired product as a tan solid. MS APCI (+) m/z 286 (M+1) detected; MS APCI (−) m/z 284 (M−1) detected.

Workup

  1. filtrationfiltered through Celite
  2. washrinsing with ethyl acetate
  3. concentrationThe filtrate is concentrated under reduced pressure
  4. customto give a yellow solid
  5. customThe solid is triturated with diethyl ether

Sources & evidence

ORD record
ord-88a5d5f61f924693a6bb4664e1388590
Source dataset
uspto-grants-2013_08
Patent number
US08513293B2

Reaction notes

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