Diethyl Ether → Di-3-pyridinylmethanone

Beteiligte Stoffe

Reaktionsschritte

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.

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