Pyridine → Methyl 3-chloro-4-{[(4-nitrophenoxy)carbonyl]amino}benzoate

関与物質

反応手順

To a solution of 5.43 g of 4-nitrophenyl chloroformate in 100 mL of dichloromethane was added 2.4 mL of pyridine under ice-cooling, and 5 g of methyl 4-amino-3-chlorobenzoate was added to the obtained mixture, followed by stirring at room temperature overnight. The reaction mixture was concentrated under reduced pressure, and ethyl acetate was added to the residue, followed by washing with 1 M hydrochloric acid, water, a saturated aqueous sodium hydrogen carbonate solution, water, and a saturated aqueous sodium chloride solution in this order. The organic layer was dried over anhydrous sodium sulfate, and after filtration, the filtrate was concentrated under reduced pressure. The obtained solid was dissolved in 200 mL of toluene under heating, and left to be cooled to room temperature, and further cooled in an ice bath. The precipitated solid was collected by filtration, and dried under reduced pressure to obtain 5.59 g of methyl 3-chloro-4-{[(4-nitrophenoxy)carbonyl]amino}benzoate as a white solid.

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