Hydrogen Peroxide → 2-Amino-3-chloro-4-methoxybenzoic acid

A suspension of compound 103d (6.03 g, 28.52 mmol), NaOH (1.25 g, 31.37 mmol), and NaCl (3.49 g, 59.89 mmol) in water (60 mL) was stirred at room temperature for 30 min and was then ice-cooled. H2O2 was added dropwise. The mixture was stirred at 0° C. for 20 min and at room temperature for 3 hrs. The reaction mixture was quenched with glacial AcOH, filtered, and washed with water. The solid obtained was dissolved in DCM, dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude material was purified by chromatography on silica gel (DCM/MeOH) to yield compound 104d as an orange solid in 36% yield.

1. temperatureice-cooled
2. stirringThe mixture was stirred at 0° C. for 20 min and at room temperature for 3 hrs
3. customThe reaction mixture was quenched with glacial AcOH
4. filtrationfiltered
5. washwashed with water
6. customThe solid obtained
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure
10. customThe crude material was purified by chromatography on silica gel (DCM/MeOH)

ORD-Eintrag

ord-8345de03bd9c4a5eb8da0115f0dbe628

Quelldatensatz

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08093379B2