反应详情

Into a 4 mL screwcap vial was placed 1,1-dimethylethyl (3S)-3-({4-[3-fluoro-3′-(methyloxy)-4-biphenylyl]-5-oxo-4,5-dihydro-1H-1,2,4-triazol-3-yl}methyl)-1-pyrrolidinecarboxylate (0.226 mmol). Added to the vial was 4N HCl in dioxane (2.0 mL). The vial was capped and the solution was stirred at room temperature for 2 h. The solution was concentrated in vacuo. Into the vial were place dichloromethane (1 mL) and N,N-diisopropylethylamine (0.14 mL). The solution was cooled in an ice bath. Into a separate vial, propanoyl chloride (0.217 mmol) was taken up in dichloromethane (1 mL) and then 0.5 ml, of this solution was added to the cold reaction. The vial was capped and stirred for 1 h, allowing the ice bath to slowly warm to room temperature. Since it was determined that the reaction was not complete, additional 0.10 mL of propanoyl chloride solution in dichloromethane was added to the reaction. After 1 h, the reaction was complete. Dichloromethane (1 mL) and saturated aq NH4Cl were added to the reaction. The vial was lightly agitated and the liquid phases were allowed to separate. The organic layer was separated, dried over sodium sulfate, filtered, and concentrated in vacuo. Reverse phase HPLC (10-70% acetonitrile/water+0.1% NH4OH) was utilized in purifying the title compound (21 mg, 21%). MS(ES)+ m/e 424.9 [M+H]+.

1. additionAdded to the vial
2. customThe vial was capped
3. concentrationThe solution was concentrated in vacuo
4. temperatureThe solution was cooled in an ice bath
5. addition0.5 ml, of this solution was added to the cold reaction
6. customThe vial was capped
7. stirringstirred for 1 h
8. temperatureto slowly warm to room temperature
9. waitAfter 1 h
10. stirringThe vial was lightly agitated
11. customto separate
12. customThe organic layer was separated
13. dry with materialdried over sodium sulfate
14. filtrationfiltered
15. concentrationconcentrated in vacuo
16. customin purifying the title compound (21 mg, 21%)