反应详情

To a solution of triphenylphosphine (7.08 g, 27 mmol) in anhydrous dichloromethane (11 ml) was added dropwise a solution of carbon tetrabromide (4.3 g, 13 mmol) in anhydrous dichloromethane (5 ml) at 10° C., and the mixture was stirred at the same temperature for 15 mins. Stirring was stopped, the supernatant of the reaction mixture was collected, and a solution of tert-butyl 4-(4-formyl-1,3-thiazol-2-yl)piperidine-1-carboxylate (1.0 g, 3.4 mmol) in anhydrous dichloromethane (11 ml) was added dropwise at 10° C. After stirring at 5-10° C. for 40 mins, triethylamine (4 ml) and saturated aqueous sodium hydrogen carbonate solution (0.5 ml) were added. The mixture was filtered through a Celite pad, and the insoluble material was washed with dichloromethane. The filtrate and washing solution were combined and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=1:4) to give tert-butyl 4-[4-(2,2-dibromovinyl)-1,3-thiazol-2-yl]piperidine-1-carboxylate (1.5 g, yield 97%) as a yellow oil.

1. stirringStirring
2. customthe supernatant of the reaction mixture was collected
3. stirringAfter stirring at 5-10° C. for 40 mins
4. filtrationThe mixture was filtered through a Celite pad
5. washthe insoluble material was washed with dichloromethane
6. washThe filtrate and washing solution
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by silica gel column chromatography (ethyl acetate:hexane=1:4)