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

HRID 1019199Notes

Reaction equation

C[O:2][C:3](=[O:20])[CH:4]([O:13][CH:14]1[CH2:19][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:20])=[O:2])[CH2:19][CH2:18][CH2:17][CH2:16][CH2:15]1

Participants

Conditions

Temperature: 25 °C

Procedure

A solution of rac-cyclohexyloxy-(3,4-dichloro-phenyl)-acetic acid methyl ester (527 mg, 1.66 mmol) in ethanol (15 mL) was treated with a solution of potassium hydroxide (233 mg, 4.15 mmol) in water (2 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 1N hydrochloric acid and extracted with dichloromethane (3×15 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The residual oil was purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 chloroform/methanol plus 1% acetic acid) to give rac-cyclohexyloxy-(3,4-dichloro-phenyl)-acetic acid (487 mg, 97% yield) as a colorless oil: EI-HRMS m/e calcd for C14H16Cl2O3 (M+) 302.0477, found 302.0486.

Workup

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

Sources & evidence

ORD record: ord-06cda332301340d7a953af2226e90b1e
Source dataset: uspto-grants-2002_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06486184B2

Reaction notes

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