反应详情

1.70 g (purity 82%, 3.82 mmol) of 2-[4-(5-chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]-3-(trans-4-methoxycyclohexyl)propanoic acid (racemate), 631 mg (3.82 mmol) of ethyl 4-aminobenzoate, 543 mg (3.82 mmol) of Oxima and 595 μl (3.82 mmol) of DIC in 38 ml of dimethylformamide were reacted according to General Method 5B. After complete conversion, the reaction solution was diluted with 213 ml of 10% strength lithium chloride solution and 170 ml of ethyl acetate and the phases were separated. The aqueous phase was extracted twice with 170 ml of ethyl acetate. The combined organic phases were dried over magnesium sulphate and filtered, and the solvent was removed under reduced pressure. The crude product was purified by column chromatography (ethyl acetate/cyclohexane gradient, 100 g silica cartridge, flow rate 50 ml/min), giving the title compound. Yield: 1.1 g (purity 78%, 49% of theory)

1. customthe phases were separated
2. extractionThe aqueous phase was extracted twice with 170 ml of ethyl acetate
3. dry with materialThe combined organic phases were dried over magnesium sulphate
4. filtrationfiltered
5. customthe solvent was removed under reduced pressure
6. customThe crude product was purified by column chromatography (ethyl acetate/cyclohexane gradient, 100 g silica cartridge, flow rate 50 ml/min)