反应详情

To a solution of (R)-6-amino-2-(4-fluoro-3,5-dimethyl-phenylamino)-hexanoic acid methyl ester (0.400 g, 1.009 mmol), 4-fluoro-3-methylbenzaldehyde (0.139 g, 1.009 mmol), and triethylamine (0.204 g, 2.018 mmol) in 10 mL of dichloroethane, was added NaBH(OAc)3 (0.299 g, 1.413 mmol). After stirring at room temperature for 63 h, the reaction was quenched with 30 mL of saturated NaHCO3 solution and the reaction mixture was extracted with ethyl acetate (30 mL×3). The combined organic extracts dried (Na2SO4), filtered, and concentrated under reduced pressure. The product was isolated by Flash column chromatography (silica gel column) eluting with 0-10% methanol/dichloromethane to give the title compound as brown oil (0.357 g, 87% yield). GC-MS: tR=7.5 min; m/z 404 (M+).

1. customthe reaction was quenched with 30 mL of saturated NaHCO3 solution
2. extractionthe reaction mixture was extracted with ethyl acetate (30 mL×3)
3. dry with materialThe combined organic extracts dried (Na2SO4)
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe product was isolated by Flash column chromatography (silica gel column)
7. washeluting with 0-10% methanol/dichloromethane