反应详情

温度

-67 °C

27.6 g (0.116 mol) of 2,5-dibromopyridine in 1 000 ml of ethyl ether are introduced into a 2 000 ml three-necked flask, the reaction mixture is cooled to −67° C. and 56 ml (0.140 mol) of a 2.5 M solution of butyllithium in hexane are added dropwise in 10 min. The mixture is stirred at −67° C. for 45 min before adding 14.5 g (0.116 mol) of 1-azabicyclo[2.2.2]octan-3-one in solution in 150 ml of ethyl ether in 45 min, and the mixture is stirred at −67° C. for 3 h. 300 ml of a saturated aqueous solution of ammonium chloride are added followed by 200 ml of a concentrated aqueous solution of sodium hydroxide, the aqueous phase is extracted with chloroform, and the organic phases are dried and concentrated under reduced pressure. The residue is purified by chromatography on a silica gel column, eluting with a 95/5/0.5, then 80/15/1.5, mixture of chloroform, methanol and ammonia.

1. stirringthe mixture is stirred at −67° C. for 3 h
2. extractionthe aqueous phase is extracted with chloroform
3. customthe organic phases are dried
4. concentrationconcentrated under reduced pressure
5. customThe residue is purified by chromatography on a silica gel column
6. washeluting with a 95/5/0.5
7. addition80/15/1.5, mixture of chloroform, methanol and ammonia