反应详情

To a solution of 3-bromopyridine (9.84 g, 0.062 mol) in 300 mL of ether cooled to -78° C. was added n-butyllithium (1.6M, 41 mL, 0.066 mol) and stirred for 30 min. N-Methyl,N-methoxy-urethane (3.76 g, 0.028 mol) in 20 mL of ether was added in 10 min, the mixture was stirred (-78° C.) for 1 h, allowed to warm to room temperature and stirred for 2 h. The reaction mixture was quenched with 6N HCl (100 mL) and stirred. The aqueous layer was basified with 10% NaOH solution, extracted with ethyl acetate (2×) and methylene dichloride. The organic layer was dried over sodium sulfate, concentrated in vacuo, and the residue was purified by chromatography on silica (ethyl acetate, 10% methanol/ethyl acetate) to afford 1.7 g (33%) of di-(3-pyridyl)ketone.

1. stirringthe mixture was stirred (-78° C.) for 1 h
2. stirringstirred for 2 h
3. customThe reaction mixture was quenched with 6N HCl (100 mL)
4. stirringstirred
5. extractionextracted with ethyl acetate (2×) and methylene dichloride
6. dry with materialThe organic layer was dried over sodium sulfate
7. concentrationconcentrated in vacuo
8. customthe residue was purified by chromatography on silica (ethyl acetate, 10% methanol/ethyl acetate)