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Synthesis 2005(6): 893-898
DOI: 10.1055/s-2005-861833
DOI: 10.1055/s-2005-861833
PAPER
© Georg Thieme Verlag Stuttgart · New York
Enantiospecific Synthesis of Both Enantiomers of 2-Benzyloxydihydropyran-3-ones from Arabinose
Further Information
Received
25 June 2004
Publication Date:
21 February 2005 (online)
Publication History
Publication Date:
21 February 2005 (online)
Abstract
Approaches to the enantioselective synthesis of the useful building blocks (2R)- and (2S)-2-benzyloxy-2(H)-pyran-3(6H)-one (12 and 17, respectively) are described. The most direct and highly yielding route for the synthesis of 12 was based on the ‘one-pot’ preparation of benzyl 2-O-acetyl-arabinopyranoside 3,4-thionocarbonates (7 and 14) from benzyl β-l- or β-d-arabinopyranosides (1 and 13). Trimethylphosphite-promoted olefination, followed by O-deacetylation and oxidation gave the optically pure enantiomeric enones 12 and 17 in about 50% overall yield.
Key words
enones - carbohydrates - stereoselective synthesis - chiral pool - olefination
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