Br[C:2]1[N:7]=[C:6]([C:8]([O:10][CH3:11])=[O:9])[CH:5]=[CH:4][CH:3]=1.C([O-])(=O)C.[Na+].[C:17]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])(=[O:20])[CH:18]=[CH2:19]>C1(C)C=CC=CC=1.[CH2-]C=C.[CH2-]C=C.Cl[Pd+].Cl[Pd+]>[CH3:11][O:10][C:8]([C:6]1[CH:5]=[CH:4][CH:3]=[C:2]([CH:19]=[CH:18][C:17]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[N:7]=1)=[O:9]Methyl 6-bromo-2-pyridinecarboxylate (1) (5.0 g, 23.1 mmol), sodium acetate (5.7 g, 3.0 eq), tris-O-tolylphosphine (0.7 g, 2.3 mmol), allylpalladium chloride dimer (0.34 g, 0.93 mmol) and tert-butyl acrylate (3.6 g, 1.2 eq) are mixed in toluene (25 ml), and the resulting slurry is heated under a nitrogen atmosphere at 110 LC for approximately 12-16 hours. After cooling to ambient temperature, the precipitate is removed by filtration, and rinsed with ethyl acetate. The filtrate is washed with 1M aqueous citric acid, water, and brine, and then dried with MgSO4 and filtered. The solvent is removed, and the resulting yellow solid is crystallized from EtOAc/hexane to give the pure product as a yellow solid. MS: m/z (EI+) 264.1.
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