Add time:08/20/2019         Source:sciencedirect.com

Two synthetic approaches to 2,6-dideoxy-4-S-methyl-4-thio-D-ribo pyranose, a component of the oligosaccharide of esperamicins are described. An asymmetric synthesis, starting from the propargylic alcohol dimer, relies on the Sharpless asymmetric epoxidation and the regio-selective opening of epoxy alcohols. The other synthesis is based on stereocontrolled transformations of a readily available sugar precursor, d-galactose.

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