反应详情

温度

115 °C

To a stirred solution of trifluoro-methanesulfonic acid 4-formyl-2,6-dimethyl-phenyl ester (4.7 g, 16.7 mmol) in dry DMF (75 mL) under argon is sequentially added at rt triethylamine (3.4 g, 33.3 mmol), methyl acrylate (14.3 g, 167 mmol), 1,3-bis-(diphenylphosphino)-propane (378 mg, 0.92 mmol) and Pd(OAc)2 (187 mg, 0.83 mmol). The mixture is heated to 115° C. and stirred for 5 h. The mixture is diluted with diethyl ether (350 mL) and washed twice with aq. 1 N HCl and once with sat. aq. NaHCO3. The organic extract is dried over MgSO4, filtered and evaporated. The residue is purified by CC on silica gel eluting with heptane:EA 5:1 to give 3-(4-formyl-2,6-dimethyl-phenyl)-acrylic acid methyl ester (2.9 g) as a slightly yellow solid; LC-MS: tR=0.96 min.

1. washwashed twice with aq. 1 N HCl and once with sat. aq. NaHCO3
2. extractionThe organic extract
3. dry with materialis dried over MgSO4
4. filtrationfiltered
5. customevaporated
6. customThe residue is purified by CC on silica gel eluting with heptane:EA 5:1