Hydrochloric Acid → 2-[4-(5-Chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]-3-(3-methyloxetan-3-yl)propanoic acid

Participants

Reaction Steps

340 mg (741 μmol) of tert-butyl 2-[4-(5-chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]-3-(3-methyloxetan-3-yl)propanoate (racemate) were dissolved in 5 ml of tetrahydrofuran, 2.5 ml of ethanol and 2.5 ml of water, and 3.7 ml (3.7 mmol, 5 eq.) of aqueous lithium hydroxide solution (1M) were added. The mixture was stirred at room temperature for another 7 h and then diluted with 20 ml of saturated aqueous ammonium chloride solution and 30 ml of ethyl acetate and adjusted to pH 4-5 using aqueous hydrochloric acid (1N). The phases were separated and the aqueous phase was extracted three times with 10 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 used for the next step without further purification. Yield: 275 mg (purity 95%, 88% of theory)

Provenance & Evidence