2-Ulosonic ester halides glycosylation reactions

The major products 265 and 266 arise from an attack of oxidant anti to the pyranosic oxygen atom and substituent in position 6. Activation of the anomeric carbon was achieved through NBS mediated C-2-C-3 dibromination. Dibromides 267 have been shown to serve as glycosyl donors in Koenigs-Knorr type reaction, since blocking the 3-axial position prevent the competitive elimination, often observed during glycosylation reactions of 2-ulosonic ester halides [149], The racemic 4-e/w-DAH acetylated esters 268 were thus obtained. 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

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