反应详情

1,4-Dibromobenzene (6.5 g, 27 mmol) was dissolved in tetrahydrofuran (120 mL), and a solution of n-butyllithium in hexane (2.6 M, 10 mL, 27 mmol) was added at −78° C., followed by stirring at the same temperature for 30 minutes. A solution of N,6-dimethoxy-N-methylnicotinamide (2.7 g, 14 mmol) in tetrahydrofuran (20 mL) was added to the reaction solution, followed by stirring at −78° C. for further 30 minutes. Water was added to the reaction solution, followed by extraction with ethyl acetate, and subsequently the organic layer was concentrated under reduced pressure. The resulting residue was purified by chromatography on a silica gel column (Moritex Corporation, elution solvent: hexane/ethyl acetate), and a fraction corresponding to the Rf value=0.50 (hexane/ethyl acetate=10/1) by thin layer chromatography was concentrated under reduced pressure to afford the title compound (2.8 g, 9.4 mmol) as a white solid (yield 69%).

1. stirringby stirring at −78° C. for further 30 minutes
2. extractionfollowed by extraction with ethyl acetate
3. concentrationsubsequently the organic layer was concentrated under reduced pressure
4. customThe resulting residue was purified by chromatography on a silica gel column (Moritex Corporation, elution solvent: hexane/ethyl acetate)
5. concentrationa fraction corresponding to the Rf value=0.50 (hexane/ethyl acetate=10/1) by thin layer chromatography was concentrated under reduced pressure