tert-Butyl methyl ether → 2-Cyclopenten-1-ol, 4-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-, cis-

HRID 2544

Reaction equation

[O:1]([CH:9]1[CH2:13][C:12](=[O:14])[CH:11]=[CH:10]1)[Si:2]([C:5]([CH3:8])([CH3:7])[CH3:6])([CH3:4])[CH3:3].[Mg+2].[Br-].[Br-].[H-].[Al+3].[Li+].[H-].[H-].[H-].COC(C)(C)C>C1(C)C=CC=CC=1>[Si:2]([O:1][C@@H:9]1[CH2:13][C@H:12]([OH:14])[CH:11]=[CH:10]1)([C:5]([CH3:8])([CH3:7])[CH3:6])([CH3:4])[CH3:3]

Participants

Conditions

Temperature: -25 °C

Procedure

A stirred solution of 4-tert-butyldimethylsiloxy-2-cyclopentenone (2.0 g, 9.42 mmol) in anhydrous toluene (15 mL) under an atmosphere of argon is treated with MgBr2 (3.5 g, 19.0 mol). The mixture is cooled to -25° C. and treated with lithium aluminum hydride (178 mg, 4.69 mmol) in one portion, followed by addition of anhydrous tert-butyl methyl ether (3.0 mL). The reaction is stirred at -20° C. for 2 hours and then overnight at room temperature. Additional lithium aluminum hydride (178 mg, 4.69 mmol) is added at room temperature and the reaction is stirred for 2 hours. The reaction is then quenched by slow addition of 1N NaOH (5 mL) followed by filtration through diatomaceous earth. The filtrate is dried over anhydrous magnesium sulfate, filtered and concentrated under vacuum to provide the title compound (1.3 g); cis/trans/1-2 +1-4 addition, 90/3/7.

Workup

customovernight
customat room temperature
stirringthe reaction is stirred for 2 hours
customThe reaction is then quenched by slow addition of 1N NaOH (5 mL)
filtrationfollowed by filtration through diatomaceous earth
dry with materialThe filtrate is dried over anhydrous magnesium sulfate
filtrationfiltered
concentrationconcentrated under vacuum

Sources & evidence

ORD record: ord-4213d05daadd4cc1a427b80287607a1d
Source dataset: uspto-grants-1998_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05728899

Linked notes

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