Enantiospecific synthesis of both enantiomers of 2-benzyloxydihydropyran-3- ones from arabinose
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-...
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| Autores principales: | , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00397881_v_n6_p893_Uhrig |
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| Sumario: | 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. © Georg Thieme Verlag Stuttgart. |
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