反应详情

温度

92.5 °C

45 mg (0.2 mmol) of palladium acetate and then 140 mg (0.4 mmol) of 2-(dicyclohexylphosphino)biphenyl are added to a mixture of 1.65 g (4 mmol) of ethyl (E)-3-(3-ethoxy-4-trifluoromethanesulfonyloxyphenyl)-2-methylacrylate, 1.1 g (4.8 mmol) of methyl[3-(4,4,5,5-tetramethyl[1.3.2]dioxaborolan-2-yl)phenyl]amine (prepared as described in Example 28a) and 2 mL of aqueous 2 M potassium phosphate solution in 8 mL of dimethylformamide. The reaction mixture is heated at 90-95° C. for 4 hours. The medium is hydrolyzed with saturated ammonium chloride solution and extracted with ethyl acetate. The organic phases are combined, washed with saturated sodium chloride solution and dried over sodium sulfate. The solvent is evaporated off and the brown oil obtained (2.7 g) is purified by chromatography on a column of silica eluted with a 90/10 heptane/ethyl acetate mixture. 346 mg (17%) of ethyl (E)-3-(2-ethoxy-3′ methylaminobiphenyl-4-yl)-2-methylacrylate are obtained in the form of a yellow oil.

1. extractionextracted with ethyl acetate
2. washwashed with saturated sodium chloride solution
3. dry with materialdried over sodium sulfate
4. customThe solvent is evaporated off
5. customthe brown oil obtained (2.7 g)
6. customis purified by chromatography on a column of silica
7. washeluted with a 90/10 heptane/ethyl acetate mixture