Br[C:2]1[CH:7]=[CH:6][C:5]([O:8][CH3:9])=[CH:4][N:3]=1.[OH:10][C:11]1[CH:16]=[C:15]([CH3:17])[C:14]([C:18](=[O:20])[CH3:19])=[C:13]([CH3:21])[CH:12]=1.Cl.CN(C)CC(O)=O.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.[Cu](I)I.O>[CH3:9][O:8][C:5]1[CH:6]=[CH:7][C:2]([O:10][C:11]2[CH:12]=[C:13]([CH3:21])[C:14]([C:18](=[O:20])[CH3:19])=[C:15]([CH3:17])[CH:16]=2)=[N:3][CH:4]=1A mixture of 2-bromo-5-methoxypyridine (18-1, 1.03 g, 5.46 mmol), 1-(4-hydroxy-2,6-dimethylphenyl)ethanone (4-2, 0.80 g, 4.89 mmol), N,N-dimethylglycine HCl salt (0.28 g, 1.95 mmol), copper iodide (0.24 g, 1.24 mmol), and cesium carbonate (3.57 g, 10.96 mmol) in dioxane (10 mL) was heated at 120° C. for 4.0 h. The reaction mixture was cooled to room temperature, added with water, and extracted with EtOAc. The organic layer was washed with brine, dried over anhydrous MgSO4, and concentrated to give 1-{4-((5-methoxypyridin-2-yl)oxy)-2,6-dimethylphenyl}ethanone (18-2, 1.42 g) as a yellow oil in 96% yield, which was used directly for the next step without further purification.
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