反应详情

Place 1-cyclohexyl-3-(2,4-dichloro-4′-hydroxy-biphenyl-3-ylmethyl)-pyrrolidin-2-one (Example 113) (200 mg, 0.5 mmol), sodium iodide (72 mg, 0.5 mmol), and cesium carbonate (1.25 g, 3.8 mmol) in THF (10 mL). Add tert-butyl 4-bromobutanoate (213 mg, 1.0 mmol) and stir at room temperature for 3 hours. Add dichloromethane and wash with water. Dry over sodium sulfate, filter, and concentrate. Dissolve residue in dichloromethane (5 mL) and TFA (5 mL) and stir for 30 minutes. Remove solvent and dissolve product in IM NaOH. The deprotonated carboxylic acid does not go into the aqueous layer. Bring the pH ˜2 with 6M HCl and extract with dichloromethane. Dry over sodium sulfate, filter, and concentrate. Purify by silica gel (dichloromethane-5% methanol in dichloromethane) affords 158 mg (66%) the title compound as a brown solid: Mass spectrum (apci) m/z=504.2 (M+H).

1. washAdd dichloromethane and wash with water
2. dry with materialDry over sodium sulfate
3. filtrationfilter
4. concentrationconcentrate
5. dissolutionRemove solvent and dissolve product in IM NaOH
6. extractionBring the pH ˜2 with 6M HCl and extract with dichloromethane
7. dry with materialDry over sodium sulfate
8. filtrationfilter
9. concentrationconcentrate
10. customPurify by silica gel (dichloromethane-5% methanol in dichloromethane)