Diethyl Ether → 3-(4-Benzyloxyphenyl)-1-cyclopentylpropan-1-one

HRID 858750Notes

Reaction equation

N1C=CC=CC=1S[C:8](=[O:25])[CH2:9][CH2:10][C:11]1[CH:16]=[CH:15][C:14]([O:17][CH2:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)=[CH:13][CH:12]=1.[CH:26]1([Mg]Br)[CH2:30][CH2:29][CH2:28][CH2:27]1.CCOCC>C1COCC1>[CH2:18]([O:17][C:14]1[CH:13]=[CH:12][C:11]([CH2:10][CH2:9][C:8]([CH:26]2[CH2:30][CH2:29][CH2:28][CH2:27]2)=[O:25])=[CH:16][CH:15]=1)[C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=1

Participants

Conditions

Temperature: -78 °C

Procedure

3-(4-Benzyloxyphenyl)thiopropionic acid S-pyridin-2-yl ester (3.00 g, 8.58 mmol) from Step 4 above was dissolved in dry THF (45 mL) and cooled to −78° C. A solution of cyclopentylmagnesium bromide in Et2O (2.0 M, 4.51 mL, 9.02 mmol) was added dropwise along the sides of the reaction vessel. After stirring 35 min, the cooling bath was removed. The reaction mixture was quenched with saturated aq. NH4Cl upon reaching ambient temperature and extracted with Et2O (500 mL). The organic phase was washed with brine (50 mL), dried over MgSO4 and evaporated. The residue was purified by flash column chromatography (10% EtOAc in hexanes) to give the product (2.22 g, 84%) as a white semi-crystalline material.

Workup

customthe cooling bath was removed
customThe reaction mixture was quenched with saturated aq. NH4Cl
customupon reaching ambient temperature
extractionextracted with Et2O (500 mL)
washThe organic phase was washed with brine (50 mL)
dry with materialdried over MgSO4
customevaporated
customThe residue was purified by flash column chromatography (10% EtOAc in hexanes)

Sources & evidence

ORD record: ord-ed1cb50e605e49c29ab7ce141b245697
Source dataset: uspto-grants-2006_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07148226B2

Reaction notes

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