Hydrochloric Acid → ethyl N-[2,6-dichloro-4-(2-hydroxyethyl)phenyl]aminoacetate

To a stirred solution of ethyl N-[4-(2-hydroxyethyl)-phenyl]aminoacetate (1.0 g) in dichloromethane (20 ml) were added concentrated hydrochloric acid (373 μl) and ethanol (3.0 ml) at room temperature, and a solution of tert-butyl hypochlorite (1.04 ml) in dichloromethane (6 ml) was added dropwise over 10 minutes period under ice-cooling with stirring. The mixture was stirred for 10 minutes, and the reaction mixture was concentrated in vacuo. A saturated aqueous sodium bicarbonate solution was added to the residue, and the resulting mixture was extracted with ethyl acetate. The extract was washed with brine and dried over anhydrous magnesium sulfate, and the solvent was removed in vacuo. Purification of the residue by medium pressure liquid column chromatography on silica gel (eluent: hexane/ethyl acetate=3/1) gave ethyl N-[2,6-dichloro-4-(2-hydroxyethyl)phenyl]aminoacetate (695 mg).

1. temperaturecooling
2. stirringThe mixture was stirred for 10 minutes
3. concentrationthe reaction mixture was concentrated in vacuo
4. additionA saturated aqueous sodium bicarbonate solution was added to the residue
5. extractionthe resulting mixture was extracted with ethyl acetate
6. washThe extract was washed with brine
7. dry with materialdried over anhydrous magnesium sulfate
8. customthe solvent was removed in vacuo
9. customPurification of the residue by medium pressure liquid column chromatography on silica gel (eluent: hexane/ethyl acetate=3/1)

ORD-Eintrag

ord-b3b14cad81b648b795b53a46fbf81dc5

Quelldatensatz

uspto-grants-2002_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06353025B1