Ammonium formate → Methyl 4,5-diamino-3-fluoro-2-(phenylamino)benzoate

HRID 1010065Notes

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.C([O-])=O.[NH4+]>C(O)C.[OH-].[OH-].[Pd+2]>[CH3:1][O:2][C:3](=[O:22])[C:4]1[CH:9]=[C:8]([NH2:10])[C:7]([NH2:13])=[C:6]([F:14])[C:5]=1[NH:15][C:16]1[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=1

Participants

Conditions

Temperature: 95 °C

Procedure

4-Amino-3-fluoro-5-nitro-2-phenylamino-benzoic acid methyl ester 26a (11.44 g, 37.48 mmol) is suspended in ethanol (400 mL) and ammonium formate (11.80 g, 187.0 mmol) and 20% Pd(OH)2/C (10.00 g, 18.79 mmol) are added. The reaction mixture is stirred at 95° C. under N2 for 30 minutes. The reaction mixture is cooled to room temperature and then filtered through celite, rinsing with ethanol. The filtrate is concentrated under reduced pressure to give 9.63 g (93%) of the pure desired product as a purple/red solid. MS ESI (+) m/z 276 (M+1) detected.

Workup

temperatureThe reaction mixture is cooled to room temperature
filtrationfiltered through celite
washrinsing with ethanol
concentrationThe filtrate is concentrated under reduced pressure

Sources & evidence

ORD record: ord-2aef82c0840e462fbc388bca99d0868e
Source dataset: uspto-grants-2011_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07973170B2

Reaction notes

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