Hydrochloric Acid → 2-Methyl-5-(2-piperazin-1-ylethoxy)quinoline

Temperatur

40 °C

tert-Butyl 4-[2-(2-methylquinolin-5-yloxy)ethyl]piperazine-1-carboxylate (1.04 g, 2.8 mmol) was dissolved in ethanol (60 mL) and treated with 1 M hydrochloric acid in diethyl ether (16 mL, 16 mmol) and stirred at 40° C. for 17 h. The reaction mixture was filtered and the white solid was collected and dried in vacuo. The hydrochloride salt precipitate was dissolved in water (25 mL) and potassium carbonate was added until the pH reached 10. The aqueous layer was washed with 5% methanol in dichloromethane (4×100 mL) then 10% methanol in dichloromethane (4×100 mL). The organic layers were combined, dried (Na2SO4) and concentrated in vacuo, affording the title compound as a brown oil (0.69 g, 91%).

1. filtrationThe reaction mixture was filtered
2. customthe white solid was collected
3. customdried in vacuo
4. dissolutionThe hydrochloride salt precipitate was dissolved in water (25 mL)
5. additionpotassium carbonate was added until the pH
6. washThe aqueous layer was washed with 5% methanol in dichloromethane (4×100 mL)
7. dry with materialdried (Na2SO4)
8. concentrationconcentrated in vacuo

ORD-Eintrag

ord-2f53d0bbd9f543a299506b8d11dd627e

Quelldatensatz

uspto-grants-2007_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07244726B2