5-Aminosalicylic Acid → 2-Hydroxy-5-(2,3,5,6-tetrafluoro-4-trifluoromethyl-benzylamino)benzoic acid
Reaction equation
[NH2:1][C:2]1[CH:10]=[C:6]([C:7]([OH:9])=[O:8])[C:5]([OH:11])=[CH:4][CH:3]=1.C(N(CC)CC)C.[F:19][C:20]1[C:27]([F:28])=[C:26]([C:29]([F:32])([F:31])[F:30])[C:25]([F:33])=[C:24]([F:34])[C:21]=1[CH2:22]Br>CN(C=O)C>[OH:11][C:5]1[CH:4]=[CH:3][C:2]([NH:1][CH2:22][C:21]2[C:24]([F:34])=[C:25]([F:33])[C:26]([C:29]([F:30])([F:32])[F:31])=[C:27]([F:28])[C:20]=2[F:19])=[CH:10][C:6]=1[C:7]([OH:9])=[O:8]Participants
Procedure
To a solution of 5-aminosalicylic acid (1.02 g, 6.66 mmole, purchased from Aldrich Chemical Company, USA, A7, 980-9) and triethylamine (1 ml) in dried DMF (80 ml) was added 2,3,5,6-tetrafluoro-4-trifloromethylbenzyl bromide (1.23 g, 7.18 mmole) (Aldrich, 40, 640-6) at room temperature under a nitrogen atmosphere. The reaction mixture was stirred for 2 hr at room temperature and then solvent was removed in vacuo. The reaction mixture was diluted with ethyl acetate and then extracted with ethyl acetate. The organic layer was washed with water and brine, and then dried over anhydrous MgSO4. After evaporation of the solvent, the residue was recrystallized from ether/hexane (1:10) to give 1.60 g (64% yield) of 2-hydroxy-5-(2,3,5,6-tetrafluoro-4-trifluoromethylbenzylamino)benzoic acid as a white solid.
Workup
- customsolvent was removed in vacuo
- additionThe reaction mixture was diluted with ethyl acetate
- extractionextracted with ethyl acetate
- washThe organic layer was washed with water and brine
- dry with materialdried over anhydrous MgSO4
- customAfter evaporation of the solvent
- customthe residue was recrystallized from ether/hexane (1:10)
Sources & evidence
- ORD record
- ord-1fd346ee2ba144769333c7ab07fca1b5
- Source dataset
- uspto-grants-2005_08
- Patent number
- US06927303B2
Reaction notes
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