Sulfuric Acid → 3-Isobutylamino-2-methyl-4-(methylsulfonyl)benzoic acid
Reaction equation
F[C:2]1[C:3]([CH3:15])=[C:4]([CH:8]=[CH:9][C:10]=1[S:11]([CH3:14])(=[O:13])=[O:12])[C:5]([OH:7])=[O:6].[CH2:16]([NH2:20])[CH:17]([CH3:19])[CH3:18].S(=O)(=O)(O)O>>[CH2:16]([NH:20][C:2]1[C:3]([CH3:15])=[C:4]([CH:8]=[CH:9][C:10]=1[S:11]([CH3:14])(=[O:13])=[O:12])[C:5]([OH:7])=[O:6])[CH:17]([CH3:19])[CH3:18]Participants
4
Procedure
2.0 g (9 mmol) of 3-fluoro-2-methyl-4-(methylsulfonyl)benzoic acid were dissolved in 26.5 ml (267 mmol) of isobutylamine. The mixture was heated at reflux with stirring for 8 days, cooled to RT, acidified with 10% strength sulfuric acid and extracted twice with ethyl acetate. The combined organic phases were dried over MgSO4, and the solvent was removed under reduced pressure. This gave 2.4 g of a colorless solid of a purity of 98%.