Methyl iodide → Methyl 4-chloro-2-[(3-chloropropyl)amino]-3-nitrobenzoate

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A mixture of 4-chloro-2-[(3-chloropropyl)amino]-3-nitrobenzoic acid (150 mg, 0.512 mmol), methyl iodide (0.0319 mL, 0.512 mmol) and potassium carbonate (70.8 mg, 0.512 mmol) in N,N-dimethylformamide (1.5 mL) was stirred at room temperature for 12 h. After addition of ethyl acetate, the resultant mixture was washed with water and brine, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on NH silica gel eluting with a 5% ethyl acetate/n-hexane mixture to afford a yellow oil (141 mg, 0.459 mmol, 90%).

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