[CH3:1][Si](C=[N+]=[N-])(C)C.[NH2:8][C:9]1[C:17]([CH3:18])=[C:16]([Br:19])[CH:15]=[CH:14][C:10]=1[C:11]([OH:13])=[O:12]>C(OCC)(=O)C.C(O)C>[NH2:8][C:9]1[C:17]([CH3:18])=[C:16]([Br:19])[CH:15]=[CH:14][C:10]=1[C:11]([O:13][CH3:1])=[O:12]Add (trimethylsilyl)diazomethane (16.5 mL, 33 mmol, 2 M in hexane) to a solution of 2-amino-4-bromo-3-methyl-benzoic acid (3.8 g, 16.5 mmol) in ethyl acetate (50 mL) and ethanol (50 mL) at room temperature and stir the solution for 16 h. Remove the solvent under reduced pressure. Chromatograph the residue over silica gel, eluting with hexanes/ethyl acetate, to afford the title compound (3.54 g, 88%). MS (ES+): 245 (M+H).
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