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Volumn , Issue 4, 2009, Pages 664-666

Enantioselective alkylation of α-fluoro-β-keto esters by asymmetric phase-transfer catalysis

Author keywords

Alkyl halides; Alkylations; Asymmetric catalysis; Esters; Phase transfer catalysis

Indexed keywords


EID: 62249108716     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0028-1087813     Document Type: Article
Times cited : (29)

References (41)
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    • Typical Procedure for the Catalytic Asymmetric Alkylation of tert-Butyl 2-Fluoro-3-oxo-3-phenylpropanoate (2b) under Phase-Transfer Conditions To a solution of phase-transfer catalyst (S,S)-1 (0.001 mmol, 0.9 mg) and 2b (0.10 mmol, 23.6 mg) in mesitylene (2 mL) was added benzyl bromide (0.12 mmol, 14.0 μL, and the mixture was cooled to 0°C. After adding 10% aq CsOH (0.3 mL, ca. 0.2 mmol) to this mixture, the reaction mixture was vigorously stirred until the completion of the reaction. The mixture was then poured into sat. aq NH 4Cl and extracted with EtOAc. The organic layer was dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on SiO2 to give tert-butyl 2-benzyl-2-fluoro-3-oxo-3-phenylpropanoate (3b) as a colorless oil [82, 26.8 mg, 85% ee, Enantiomeric purity was determined by HPLC analysis [Daicel Chiralpak OD, hexane-2-PrOH 3
    • 2), 1.29 (9 H, s, t-Bu).


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