反应详情

Add a solution of sodium hydroxide (2.60 g, 65 mmol) in water (50 mL) to a solution of 7-[5-(5-chloro-2-hydroxyphenyl)thiazol-2-yl]heptanoic acid methyl ester (5.76 g, 16 mmol) in methanol (100 mL) at 0° C. under nitrogen, warm the mixture to room temperature, and stir for a total of 1.5 hours. Remove the solvent under reduced pressure, dilute the residue with water (200 mL), cool to 0° C., and acidify to pH 1 with 1 N HCl. Collect the precipitate by filtration to afford 7-[5-(5-chloro-2-hydroxyphenyl)thiazol-2-yl]heptanoic acid (5.21 g, 95%): APCI mass spectrum m/z 338 [C16H18ClNO3S—H]−.

1. customRemove the solvent under reduced pressure
2. additiondilute the residue with water (200 mL)
3. temperaturecool to 0° C.
4. customCollect the precipitate
5. filtrationby filtration