4-Nitrophenol → 3-(2-Amino-benzo[d]phenyl)-2-methyl-2-propenoic acid p-nitrophenyl ester

Participants

Reaction Steps

Into 20 ml of dichloromethane, 0.57 g (2.5 mmol) of (E) 3-(2-amino-benzo[d]phenyl)-2-methyl-2-propenoic acid and 0.52 g (3.8 mmol) of p-nitrophenol (manufactured by Wako Pure Chemical Industries, Ltd.) were dissolved; and 20 mg of dimethylaminopyridine (manufactured by Wako Pure Chemical Industries, Ltd.) were added thereto. Further, while the mixture was stirred under cooling with ice, 0.71 g (3.8 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (EDC-HCl) (manufactured by Wako Pure Chemical Industries, Ltd.) was added thereto in portions. The mixture was returned to room temperature and then was stirred for 20 hours. After the end point of this reaction was verified by TLC, the reaction liquid was concentrated under a reduced pressure and then was dissolved in 100 ml of ethyl acetate. This solution was washed several times with a 5% aqueous sodium hydrogencarbon ate solution and then with a saturated aqueous sodium chloride solution, and was dried with magnesium sulfate anhydride. Thereafter, the solvent was evaporated, whereby a crude product was obtained. This product was recrystallized from ethanol, whereby 0.69 g of the aimed product was obtained as a crystal (yield: 80%).

Provenance & Evidence