反应详情

Ethyl 3-[2-(2-hydroxyethylcarbamoyl)phenyl]-2-methylacrylate is prepared as described in Example 30, starting with 1.17 g (5.0 mmol) of 2-(2-ethoxycarbonylpropen-1-yl)benzoic acid in 10 cm3 of dimethylformamide, a solution of 0.69 cm3 (5.0 mmol) of triethylamine and 1.64 g (5.0 mmol) of O-[(cyano(ethoxycarbonyl)methylene)amino]1,1,3,3-tetramethyluronium tetrafluoroborate (“TOTU”) in 6 cm3 of dimethylformamide, and a second solution consisting of 306 mg (5.0 mmol) of ethanolamine and 0.69 cm3 (5.0 mmol) of triethylamine in 10 cm3 of dimethylformamide. 1.14 g of ethyl 3-[2-(2hydroxyethylcarbamoyl)phenyl]-2-methacrylate are thus obtained in the form of a yellowish oil, which can be reacted in the following step without further purification.