Water → 4-Tert-butoxycarbonylamino-3-methylaminobenzoic acid methyl ester

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Reaction Steps

After dissolving 4-tert-butoxycarbonylamino-3-[methyl-(2-nitro-benzenesulfonyl)-amino]-benzoic acid methyl ester (1.41 g, 2.73 mmol) in dimethylformamide (10 ml), potassium carbonate (1.13 g, 8.16 mmol) and thiophenol (0.307 ml, 2.99 mmol) were added in an ice bath, and the mixture was stirred at room temperature for 1 hour. Water (100 ml) was added to the reaction mixture, and extraction was performed with ethyl acetate (40 ml×3 times). The obtained organic layer was washed with saturated brine and then dried over anhydrous magnesium sulfate. The residue obtained by concentration under reduced pressure was purified by silica gel column chromatography (n-hexane/ethyl acetate=85/15) to obtain 4-tert-butoxycarbonylamino-3-methylamino-benzoic acid methyl ester. The compound was identified by LC-MS. Yield: 794.3 mg (62.7%), [M+1]=281.1.

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