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2-amino-4-bromo-3-methylbenzoic acid synthesis

4synthesis methods
6-bromo-7-methyl-1H-indole-2,3-dione

129833-54-1
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2-amino-4-bromo-3-methylbenzoic acid

129833-29-0
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Yield: 65%

Reaction Conditions:

with water;dihydrogen peroxide;sodium hydroxide at 20; for 1 h;

Steps:

17 2-Amino-4-bromo-3-methyl-benzoic acid
H2O2 (37%, 9.5 mL, 0.075 mol) in H2O (83 mL) is slowly added to a solution of 6-Bromo-7-methyl-1H-indole-2,3-dione (8.4 g, 0.035 mol) and NaOH (9.6 g, 0.24 mol) in H2O (185 mL) then stirred at room temperature for 1 h, After reaction, the mixture is filtered and the solid is dried under vacuum to give product. Yield: 5.24 g (65%)

References:

Boehringer Ingelheim International GmbH;ENGELHARDT, Harald;GIANNI, Davide;MANTOULIDIS, Andreas;SMETHURST, Christian US2014/296229, 2014, A1 Location in patent:Paragraph 0300; 0301