反应详情

Into 30 ml of dimethylformamide, 0.72 g (2.0 mmol) of (E) 3-(2-amino-4,5-dimethoxyphenyl)-2-methyl-2-propenoic acid p-nitrophenyl ester obtained above and 0.48 g (4.0 mmol) of 2-phenylethylamine (manufactured by Tokyo Kasei Kogyo Co., Ltd.) were dissolved; and the mixture was reacted at room temperature for one night. The reaction liquid was concentrated under a reduced pressure, and the resulting residue was dissolved in ethyl acetate. After the resulting solution was washed and was dried with magnesium sulfate anhydride, the solvent was eliminated under a reduced pressure, whereby a crude product was obtained. This product was refined by an aminopropyl-modified type silica gel column chromatography (n-hexane/ethyl acetate=1/1), whereby 0.68 g of the aimed compound was obtained (yield: quantitative).