Pyridine → HCID 69063936, compound

Participants

Reaction Steps

After dissolving 3-amino-4-tert-butoxycarbonylaminobenzoic acid methyl ester (817.3 mg, 3.07 mmol) in dichloromethane (10 ml), pyridine (0.373 ml, 4.60 mmol) and 2-nitrobenzenesulfonyl chloride (815 mg, 3.68 mmol) were added in an ice bath, and the mixture was stirred at room temperature for 4 hours. Pyridine (0.050 ml) and 2-nitrobenzenesulfonyl chloride (135 mg) were added, and stirring was continued for 2 hours. The reaction mixture was concentrated under reduced pressure, water (30 ml) was added, and then extraction was performed with ethyl acetate (20 ml×3 times). The obtained organic layer was washed with saturated brine and then dried over anhydrous magnesium sulfate. After concentration under reduced pressure, the crystallized residue was suspended in n-hexane-ethyl acetate (4:1), filtered, and dried to obtain 4-tert-butoxycarbonylamino-3-(2-nitro-benzenesulfonylamino)-benzoic acid methyl ester. The compound was identified by LC-MS.

Provenance & Evidence