CCCC[N+](CCCC)(CCCC)CCCC.[F-].[Cl:19][C:20]1[CH:29]=[C:28]([CH:30]=O)[CH:27]=[CH:26][C:21]=1[C:22]([O:24]C)=[O:23].[F:32][C:33]([F:50])([F:49])[CH2:34]P(=O)(C1C=CC=CC=1)C1C=CC=CC=1>C1COCC1>[Cl:19][C:20]1[CH:29]=[C:28](/[CH:30]=[CH:34]/[C:33]([F:50])([F:49])[F:32])[CH:27]=[CH:26][C:21]=1[C:22]([OH:24])=[O:23]4 Å molecular sieves (powder, 16 g) was added to a 1 M solution of TBAF in THF (20 mL, 20 mmol), and the mixture was stirred at room-temperature overnight under an argon atmosphere. To the mixture were added a solution of methyl 2-chloro-4-formylbenzoate (210 mg, 0.0010 mol) and 2,2,2-trifluoroethyldiphenylphosphine oxide (600 mg, 0.0021 mol) in THF (15 mL). After the mixture was stirred for 2 h, the molecular sieves were removed by filtration. The filtrate was concentrated and water (120 mL) was added. The mixture was extracted with AcOEt. The organic extract was washed with brine, dried (Na2SO4), and concentrated. The residue was chromatographed on silica gel with AcOEt [1% HOAc]-hexane to give the product as a white solid. LC-MS: t=3.12 min, m/z=248.9 & 250.9 (M−1).
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