反应详情

In a 500 ml, three-necked flask fitted with a magnetic stirrer and a reflux condenser under inert atmosphere, ethyl 4-amino-3-phenylbutanoate hydrochloride x42 (synthesized as described in patent application EP1265862, 6.2 g, 38 mmol), 1-trityl-1H-imidazole-4-carbaldehyde x43 (Dolensky B., Kirk K. L., Collect. Czech. Chem. Commun. (2002), 67, 1335-1344; 8.2 g, 36.1 mmol) and MeOH (150 ml) are stirred at room temperature. Triethylamine (3.9 ml, 41.85 mmol) and NaBH4 (1.06 g, 41.8 mmol) are added by portions. The mixture is stirred at 45° C. for 3 h, then at room temperature overnight. CH2Cl2 (300 ml) and water (300 ml) are added, the aqueous phase is extracted with CH2Cl2 (2×200 ml). The combined organic phases are washed with a saturated solution of NH4Cl (2×150 ml), dried, filtered and concentrated in vacuo. The crude product is recrystallized from AcOEt to afford 4-phenyl-1-[(1-trityl-1H-imidazol-4-yl)methyl]pyrrolidin-2-one x44.

1. stirringThe mixture is stirred at 45° C. for 3 h
2. customat room temperature
3. customovernight
4. extractionthe aqueous phase is extracted with CH2Cl2 (2×200 ml)
5. washThe combined organic phases are washed with a saturated solution of NH4Cl (2×150 ml)
6. customdried
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe crude product is recrystallized from AcOEt