反应详情

To a solution of (2R,3R)-3-(tert-Butyldimethylsilanyloxy)-2-[(3-chloro-4-cyano-2-methylphenylamino)methyl]pyrrolidine-1-carboxylic acid tert-butyl ester (51E) (22 mg, 0.06 mmol) dissolved in THF (1 mL) was added 1,1′-carbonyldiimidazole (9.40 mg, 0.06 mmol) and the mixture was stirred at rt for 3 days, and then brought to reflux for 1 h. An aliquot (˜half of the reaction mixture) was treated with DBU (10 μL, 0.07 mmol) and the reaction mixture was heated at reflux overnight. The reaction was then diluted with EtOAc and water, and the layers were separated. The organic layer was washed with brine, concentrated under reduced pressure, and purified via preparative HPLC (Luna C-18, 21.2×100 mm, eluting with 60-100% solvent B (A=90% H2O—10% MeOH—0.1% TFA and B=10% H2O—90% MeOH—0.1% TFA) over 12 min; Flow rate at 20 mL/min. UV detection at 220 nm). The major peak was collected, concentrated and treated with TFA (2 mL) overnight. The reaction was concentrated and purified via preparative HPLC (Luna C-18, 21.2×100 mm, eluting with 40-100% solvent B (A=90% H2O—10% MeOH—0.1% TFA and B=10% H2O—90% MeOH—0.1% TFA) over 10 min; Flow rate at 20 mL/min. UV detection at 220 nm) to provide the title compound (1 mg). LC/MS m/z 292 [M+H]+.

1. temperatureto reflux for 1 h
2. temperaturethe reaction mixture was heated
3. temperatureat reflux overnight
4. customthe layers were separated
5. washThe organic layer was washed with brine
6. concentrationconcentrated under reduced pressure
7. custompurified via preparative HPLC (Luna C-18, 21.2×100 mm
8. washeluting with 60-100% solvent B (A=90% H2O—10% MeOH—0.1% TFA and B=10% H2O—90% MeOH—0.1% TFA) over 12 min
9. customThe major peak was collected
10. concentrationconcentrated
11. additiontreated with TFA (2 mL) overnight
12. concentrationThe reaction was concentrated
13. custompurified via preparative HPLC (Luna C-18, 21.2×100 mm
14. washeluting with 40-100% solvent B (A=90% H2O—10% MeOH—0.1% TFA and B=10% H2O—90% MeOH—0.1% TFA) over 10 min