Potassium Carbonate → 3-chloro-4-(cyclopropylmethoxy)Benzoic acid

Temperatur

70 °C

To a solution of methyl 3-chloro-4-hydroxybenzoate (10.0 g) in DMF (100 mL) were added potassium carbonate (14.8 g) and (bromomethyl)cyclopropane (7.80 mL), and the mixture was stirred with heating at 70° C. for 1 hr. The reaction mixture was allowed to cool to room temperature, diluted with ethyl acetate, and washed with saturated brine. The obtained organic layer was subjected to silica gel column chromatography (NH, ethyl acetate), and the solvent was evaporated. To a solution of the obtained residue in a mixed solvent of THF (50 mL) and methanol (50 mL) was added 2 M aqueous sodium hydroxide solution (54 mL), and the mixture was stirred with heating at 50° C. for 2 hr. The reaction mixture was allowed to cool to room temperature, and neutralized with 6 M hydrochloric acid, and the mixture was extracted with ethyl acetate. The obtained organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained solid was washed with ethyl acetate to give the title compound (11.7 g).

1. temperatureto cool to room temperature
2. washwashed with saturated brine
3. customthe solvent was evaporated
4. additionTo a solution of the obtained residue in a mixed solvent of THF (50 mL) and methanol (50 mL) was added 2 M aqueous sodium hydroxide solution (54 mL)
5. stirringthe mixture was stirred
6. temperaturewith heating at 50° C. for 2 hr
7. temperatureto cool to room temperature
8. extractionthe mixture was extracted with ethyl acetate
9. washThe obtained organic layer was washed with saturated brine
10. dry with materialdried over anhydrous magnesium sulfate
11. customthe solvent was evaporated under reduced pressure
12. washThe obtained solid was washed with ethyl acetate

ORD-Eintrag

ord-03c645d0b6684d4f989816ff82676a1f

Quelldatensatz

uspto-grants-2015_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09133129B2