反应详情

A mixture of 1.0 g (6.3 mmol) of 3-bromopyridine, 2.2 g (25 mmol) of piperazine, 16 mg of tris(dibenzylideneacetone)-dipalladium(0), 32 mg of (S)-(−)-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl, 1.3 g (13.4 mmol) of sodium t-butoxide, and 50 ml of toluene was heated under reflux for 24 hours in a nitrogen atmosphere. The reaction mixture was diluted with water and extracted with chloroform. The combined organic layer was washed with a saturated sodium chloride aqueous solution and dried over anhydrous sodium sulfate. The solvent was evaporated off, and the residue was purified by silica gel column chromatography using a 9:1 mixture of chloroform and methanol as a developing solvent to give 0.27 g (29%) of the title compound.

1. temperaturewas heated
2. temperatureunder reflux for 24 hours in a nitrogen atmosphere
3. extractionextracted with chloroform
4. washThe combined organic layer was washed with a saturated sodium chloride aqueous solution
5. dry with materialdried over anhydrous sodium sulfate
6. customThe solvent was evaporated off
7. customthe residue was purified by silica gel column chromatography
8. additiona 9:1 mixture of chloroform and methanol as a developing solvent