De novo highly stereocontrolled synthesis of 2,6-dideoxy sugars by use of 2,6-anhydro-2-thio sugars

Add time:07/15/2019    Source:sciencedirect.com

Representative 2,6-dideoxy sugars, l-cladinose (1), l-mycarose (2), l-oleandrose (3), l-olivose (4), and all of their C-3 epimers, 2,6-dideoxy-3-C-methyl-3-O-methyl-l-arabino-hexopyranose (26), 2,6-dideoxy-3-C-methyl-l-arabino-hexopyranose (l-olivomycose) (27), 2,6-dideoxy-3-O-methyl-l-ribo-hexopyranose (l-cymarose) (32), and 2,6-dideoxy-l-ribo-hexopyranose (l-digitoxose) (33) have been stereospecifically synthesized through a highly stereoselective addition of a nucleophilic reagent to the C-3 carbonyl groups of methyl 2,6-anhydro-4-O-benzyl-2-thio-α-l-arabino-hexopyranosid-3-ulose (11) or methyl 2,6-anhydro-4-O-benzyl-2-thio-β-l-arabino-hexopyranosid-3-ulose (12) possessing 2,6-anhydro-2-thio structures. Anomers 11 and 12 were both prepared in stereocontrolled fashion by treatment of a common intermediate, methyl 2,6-anhydro-4-O-benzyl-3-O-tetrahydropyranyl-2-thio-α-l-altropyranoside (8) with Lewis acids in methanol followed by oxidation.

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