[OH-].[Na+].[CH:3]1([O:9][CH2:10][C:11]([O:13]CC)=[O:12])[CH2:8][CH2:7][CH2:6][CH2:5][CH2:4]1.Cl>O.CO>[CH:3]1([O:9][CH2:10][C:11]([OH:13])=[O:12])[CH2:8][CH2:7][CH2:6][CH2:5][CH2:4]1To a solution of NaOH (4.89 g, 122 mmol) in a mixture of water (20 mL) and MeOH (20 mL) in an ice bath was added a solution of ethyl 2-(cyclohexyloxy)acetate (3.8 g, 20.4 mmol) in MeOH (10 mL) slowly and the mixture was stirred at rt for 2 h. It was then acidified to pH 4 with concentrated hydrochloric acid and extracted with DCM (20 mL×2). The combined organic layers were washed with brine (40 mL×2), dried over anhydrous Na2SO4 and concentrated in vacuo. The residue was purified by a silica gel column chromatography (EtOAc) to give the title compound as pale yellow oil (2.7 g, 84%).
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