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Synthesis 2002(3): 0427-0437
DOI: 10.1055/s-2002-20028
DOI: 10.1055/s-2002-20028
FEATUREARTICLE
© Georg Thieme Verlag Stuttgart · New York
Asymmetric Photodeconjugation: Highly Stereoselective Synthesis of α-Fluorocarboxylic Derivatives
Further Information
Received
23 November 2001
Publication Date:
28 July 2004 (online)
Publication History
Publication Date:
28 July 2004 (online)
Abstract
Irradiations of α-fluoro-α,β-unsaturated esters lead to the corresponding α-fluoro-β,γ-unsaturated isomers in good yields. The reaction required the use of an achiral base (typically an amine) to promote the protonation of the photodienolic intermediate. By replacing the ethyl group with a diacetone-d-glucose moiety, the reaction can be carried out in a diastereoselective manner to furnish the deconjugated esters with similar yields and selectivities up to 95%. The adducts were submitted to osmylation conditions to deliver α-fluoro-β-hydroxy-butyrolactones in one single step.
Key words
photochemistry - protonations - asymmetric synthesis - lactones - α-fluoro esters
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