反应详情

(5R)-1-(2,4-Dimethoxybenzyl)-5-ethynylpyrrolidin-2-one (600 mg, synthesized according to Tetrahedron Asymmetry, 1995, 239 using dimethyl (R)-glutamate hydrochloride as a raw material) in acetonitrile (6 mL) was added to a solution of 6-bromo-3-chloro-2-methoxypyridine (667 mg), bis(triphenylphosphine)palladium(II) dichloride (81 mg) and copper iodide (22 mg) in triethylamine (12 mL) in a nitrogen gas stream at 40° C. over 30 minutes. The mixture was stirred at room temperature for four hours. The reaction solution was poured into water, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and filtered. The solvent was then evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1→0:1) to give the title compound as a colorless oil (452 mg, 52%).

1. extractionfollowed by extraction with ethyl acetate
2. washThe organic layer was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltered
5. customThe solvent was then evaporated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1→0:1)