[CH2:1]([O:3][C:4](=[O:15])[C:5]1[CH:10]=[CH:9][CH:8]=[C:7]([N+:11]([O-])=O)[C:6]=1[OH:14])[CH3:2].[H][H].C([O-])=O.[NH4+]>CO.[Pd]>[CH2:1]([O:3][C:4](=[O:15])[C:5]1[CH:10]=[CH:9][CH:8]=[C:7]([NH2:11])[C:6]=1[OH:14])[CH3:2]To a solution of 2-hydroxy-3-nitrobenzoic acid ethyl ester 8.4 g (40 mmol) of step 1 in methanol 100 mL was added 5% Pd/C 0.84 g, after which the reactor was filled hydrogen gas, followed by stirring at room temperature for 5 hrs. Ammoniumformate 0.5 g was added to the reaction mixture before re-filling with hydrogen gas and re-stirring at room temperature for 24 hrs. The catalyst was removed by celite filtration, followed by vacuum concentration to afford the title compound 7.2 g (yield 99%).
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