S(=O)(=O)(O)O.CO.[NH2:8][C:9]1[CH:17]=[C:16]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C:15]([O:24][CH3:25])=[CH:14][C:10]=1[C:11]([OH:13])=[O:12].[C:26](=O)(O)[O-].[Na+]>C(Cl)(Cl)Cl>[NH2:8][C:9]1[CH:17]=[C:16]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C:15]([O:24][CH3:25])=[CH:14][C:10]=1[C:11]([O:13][CH3:26])=[O:12]Under ice-cooling, concentrated sulfuric acid (1 mL) was added to a methanol (10 mL) suspension of the obtained 2-amino-5-methoxy-4-phenylbenzoic acid, followed by heating to reflux for 6 hours. The reaction mixture was cooled to room temperature and was adjusted to a pH of 8.0 with a saturated aqueous solution of sodium bicarbonate, and chloroform was added thereto. The organic layer was separated and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. Hexane was added to the obtained residue, and the solid substance was collected by filtration to obtain 0.24 g of methyl 2-amino-5-methoxy-4-phenylbenzoate as a brown solid.
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