Potassium Hydroxide → Rac-cyclopentyloxy-(3,4-dichloro-phenyl)-acetic acid

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Reaktionsgleichung

C[O:2][C:3](=[O:19])[CH:4]([O:13][CH:14]1[CH2:18][CH2:17][CH2:16][CH2:15]1)[C:5]1[CH:10]=[CH:9][C:8]([Cl:11])=[C:7]([Cl:12])[CH:6]=1.[OH-].[K+]>C(O)C.O>[CH:14]1([O:13][CH:4]([C:5]2[CH:10]=[CH:9][C:8]([Cl:11])=[C:7]([Cl:12])[CH:6]=2)[C:3]([OH:19])=[O:2])[CH2:18][CH2:17][CH2:16][CH2:15]1

Komponenten

Reaktionsbedingungen

Temperatur: 25 °C

Versuchsvorschrift

A solution of rac-cyclopentyloxy-(3,4-dichloro-phenyl)-acetic acid methyl ester (266 mg, 0.877 mmol) in ethanol (10 mL) was treated with a solution of potassium hydroxide (123 mg, 2.19 mmol) in water (1 mL) and the mixture was stirred at 25° C. After 3 h, the reaction was diluted with water (5 mL) and the ethanol was removed in vacuo. The aqueous layer was then acidified to pH 2 with 1 N hydrochloric acid and extracted with dichloromethane (3×15 mL). The combined organic layers were dried over sodium sulfate, filtered and evaporated under reduced pressure. The residue was purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 chloroform/methanol plus 1% acetic acid) to afford rac-cyclopentyloxy-(3,4-dichloro-phenyl)-acetic acid (223 mg, 88% yield) as a white solid, mp 87.5-89.9 IC; EI-HRMS m/e calcd for C13H14Cl2O3 (M+) 288.0320, found 288.0332.

Aufarbeitung

customthe ethanol was removed in vacuo
extractionextracted with dichloromethane (3×15 mL)
dry with materialThe combined organic layers were dried over sodium sulfate
filtrationfiltered
customevaporated under reduced pressure
customThe residue was purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 chloroform/methanol plus 1% acetic acid)

Quellen und Nachweise

ORD-Eintrag: ord-bbc6b5b50b9644fcb088da858e78e6b6
Quelldatensatz: uspto-grants-2003_08
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US06608218B2

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