反应详情

To a solution of sodium hydride (1.2 eq) in THF was added slowly methyl diethylphosphonoacetate (1.2 eq) at 0° C. under dry conditions and the mixture was stirred at room temperature for 30 minutes. A solution of 2-methyl-2-(4-pyridin-3-yl-imidazol-1-yl)-propionaldehyde (1 eq), in THF was added dropwise at room temperature and the mixture was stirred for 1 hour at the same temperature. The mixture was poured into H2O and the whole was extracted with ethyl acetate. The organic layer was washed with NaCl (sat.), dried over sodium sulfate, filtered, and concentrated. To a solution of the residue in ethyl acetate, was added palladium, 10 wt. % on activated carbon and left stirring under 1 atm hydrogen overnight. After the catalyst was filtered off, the filtrate was purified by flash chromatography using a solvent gradient 97% DCM, 3% MeOH, and 0.1% TEA to yield 4-methyl-4-(4-pyridin-3-yl-imidazol-1-yl)pentanoic acid methyl ester (75%). MH+(274)

1. stirringthe mixture was stirred for 1 hour at the same temperature
2. extractionthe whole was extracted with ethyl acetate
3. washThe organic layer was washed with NaCl (sat.)
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. additionTo a solution of the residue in ethyl acetate, was added palladium, 10 wt. % on activated carbon
8. waitleft
9. stirringstirring under 1 atm hydrogen overnight
10. filtrationAfter the catalyst was filtered off
11. customthe filtrate was purified by flash chromatography