反应详情

To a solution of ethyl (E)-3-{[(trifluoromethyl)sulfonyl]-oxy}-2-propenoate (390 mg, 1.49 mmol) in 5 ml anhydrous dioxane was added potassium phosphate (474 mg, 2.24 mmol), 3-cyanophenyl boronic acid (217 mg, 1.49 mmol), and tetrakis (triphenylphosphine)palladium(0) (43 mg, 0.038 mmol). Reaction mixture was heated to reflux and stirred overnight. Mixture was filtered through a pad of Celite, diluted with 50 ml ethyl acetate, washed with 2×50 ml water, 2×50 ml saturated brine solution, dried over magnesium sulfate, filtered and concentrated in vacuo. Residue was chromatographed on silica gel using 5% EtOAc in hexane as the eluent to give ethyl (E) 3-(3-cyanophenyl)-2-propenoate (240 mg, 71%) as a clear yellow oil after drying. H1NMR (CDCl3): 1.2-1.32 (t, 3H); 2.547 (s, 3H); 4.18-4.24 (m, 2H); 6.113 (s, H); 7.47-7.725 (m, 4H). NOE confirmed stereo orientation.

1. customReaction mixture
2. temperaturewas heated
3. temperatureto reflux
4. filtrationMixture was filtered through a pad of Celite
5. additiondiluted with 50 ml ethyl acetate
6. washwashed with 2×50 ml water, 2×50 ml saturated brine solution
7. dry with materialdried over magnesium sulfate
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customResidue was chromatographed on silica gel using 5% EtOAc in hexane as the eluent