反应详情

Ethyl 3-(2-butylcarbamoylphenyl)-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, 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 366 mg (5.0 mmol) of n-butylamine and 0.69 cm3 (5.0 mmol) of triethylamine in 10 cm3 of dimethylformamide. 1.13 g of ethyl 3-(2-butyl-carbamoylphenyl)-2-methylacrylate are thus obtained in the form of a yellowish oil, which can be reacted in the following step without further purification.