C(O[C:5](=[O:7])[CH3:6])(=O)C.[CH3:8][C:9]1[CH:10]=[C:11]([CH:13]=[C:14]([CH3:16])[CH:15]=1)[NH2:12].NC1C=CC=CC=1.[OH-].[Na+]>C1COCC1>[CH3:8][C:9]1[CH:10]=[C:11]([NH:12][C:5](=[O:7])[CH3:6])[CH:13]=[C:14]([CH3:16])[CH:15]=1Acetic anhydride (2.84 mL, 30 mmol) was dissolved in dry THF (10 mL), purged with N2 and brought to 0° C. 3,5-Dimethylaniline (1.25 mL, 10 mmol) was then added dropwise. After the addition of the aniline, the reaction was allowed to warm to room temperature and stirred for an additional hour. The solution was then poured over ice and 1 M NaOH (aq) was added until the pH was between 12 and 14. The precipitate was filtered, dissolved in DCM and dried over Na2SO4. The drying agent was filtered and solvent was removed under reduced pressure to afford pure product in 99% yield as a white solid.
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