[Si]([O:8][C@H:9]1[CH2:13][C:12](=[O:14])[N:11]([C:15]2[CH:22]=[CH:21][C:18]([C:19]#[N:20])=[C:17]([F:23])[C:16]=2[CH3:24])[C@H:10]1[CH3:25])(C(C)(C)C)(C)C.[F-].C([N+](CCCC)(CCCC)CCCC)CCC.C1COCC1.O>C1COCC1>[F:23][C:17]1[C:16]([CH3:24])=[C:15]([N:11]2[C:12](=[O:14])[CH2:13][C@H:9]([OH:8])[C@@H:10]2[CH3:25])[CH:22]=[CH:21][C:18]=1[C:19]#[N:20]To a solution of 4-[(2S,3S)-3-(tert-butyldimethylsilyloxy)-2-methyl-5-oxopyrrolidin-1-yl]-2-fluoro-3-methylbenzonitrile (330 mg) in THF (10 mL) was added tetrabutylammonium fluoride-THF solution (1.18 mL, 1 mol/L), and the mixture was stirred at room temperature for 5 hr. The reaction mixture was added to water, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography, and recrystallized from hexane-ethyl acetate to give the title compound as a colorless solid (yield: 139 mg, 62%).
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