反应详情

3-Bromo-4-(2-phenylethenyl)pyridine (0.74 g, 2.9 mmol) was dissolved in DMF (1.4 ml). The solution was treated with tert-butyl 4-ethynylbenzoate (0.93 g 4.6 mmol), copper (III) iodide (0.023 g, 0.21mmol) and triethylamine (0.64 g, 6.3 mmol). The reaction mixture was degassed by bubbling through argon and the catalyst, bistriphenyl phosphinepalladium dichloride (0.03 g, 0.043 mmol), was added. The reaction was heated to 90°-100° C. for 3 hours and then partitioned between ethyl acetate and water. The organic layer was washed with water (3×), dried (MgSO4) and evaporated. The residue was purified by chromatography (eluting with ethylacetate/hexane) to give tert-butyl 4-[2-(4-(2-phenylethenyl)-3-pyridyl)ethynyl]benzoate as a dark oil (0.36 g, 33%).

1. customThe reaction mixture was degassed
2. customby bubbling through argon
3. additionthe catalyst, bistriphenyl phosphinepalladium dichloride (0.03 g, 0.043 mmol), was added
4. temperatureThe reaction was heated to 90°-100° C. for 3 hours
5. custompartitioned between ethyl acetate and water
6. washThe organic layer was washed with water (3×)
7. dry with materialdried (MgSO4)
8. customevaporated
9. customThe residue was purified by chromatography (eluting with ethylacetate/hexane)