Hydrochloric Acid → (Quinolin-8-yloxy)-acetic acid

Temperatur

80 °C

To a stirred mixture of quinolin-8-ol (500 mg, 3.45 mmol) in MeCN (5 mL) was added ethyl bromoacetate (687 mg, 4.14 mmol) and K2CO3 (952 mg, 6.90 mmol). The mixture was stirred at 80° C. for 4 hours until TLC analysis showed completion of the reaction. The mixture was filtered and the filtrate concentrated. NaOH (276 mg, 6.90 mmol) and water:EtOH (1:1, 10 mL) was then added to the residue and the resulting mixture stirred at 50° C. for 4 hours. After cooling, the mixture was acidified by addition of 1M HCl to pH 3 and then extracted with ethyl acetate (2×30 mL). The combined organic layers were washed with brine (30 mL), dried over anhydrous Na2SO4 and concentrated to yield the crude target product which was used directly for the next step.

1. customcompletion of the reaction
2. filtrationThe mixture was filtered
3. concentrationthe filtrate concentrated
4. stirringthe resulting mixture stirred at 50° C. for 4 hours
5. temperatureAfter cooling
6. extractionextracted with ethyl acetate (2×30 mL)
7. washThe combined organic layers were washed with brine (30 mL)
8. dry with materialdried over anhydrous Na2SO4
9. concentrationconcentrated
10. customto yield the crude target product which

ORD-Eintrag

ord-741e44abfd954f158aeec1d891319fbc

Quelldatensatz

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08940726B2