4-Bromo-2-methylaniline → 4'-Chloro-3-methylbiphen-4-ylamine

Temperatur

80 °C

To a stirred, degassed solution of 4-bromo-2-methylaniline (20 g, 0.107 mol) in toluene (1200 ml) and ethanol (400 ml), under an atmosphere of nitrogen, is added 4-chlorophenylboronic acid (20.32 g, 0.13 mol) and the reaction mixture is stirred and heated to 80° C. Tetrakis(triphenylphosphine)palladium(0) (2.48 g, 0.002 mol) is added to the reaction mixture, and to this is added 2M aqueous potassium carbonate solution (160 ml). The reaction mixture is heated at reflux for 4 hours, then cooled to room temperature. The reaction mixture was filtered through diatomaceous earth, and the filtrate was evaporated under reduced pressure. The residue is partitioned between ethyl acetate and water. The aqueous phase is extracted with ethyl acetate (3×500 ml) and the organic extracts are combined and concentrated under reduced pressure to give 4′-chloro-3-methylbiphen-4-ylamine (16.5 g).

1. temperatureThe reaction mixture is heated
2. temperatureat reflux for 4 hours
3. temperaturecooled to room temperature
4. filtrationThe reaction mixture was filtered through diatomaceous earth
5. customthe filtrate was evaporated under reduced pressure
6. customThe residue is partitioned between ethyl acetate and water
7. extractionThe aqueous phase is extracted with ethyl acetate (3×500 ml)
8. concentrationconcentrated under reduced pressure

ORD-Eintrag

ord-0b68e4c523be4516942519bf2ea1b464

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08828908B2