Xanthates deoxy sugars from

Similar homolysis of xanthates derived from galacto compounds 33 by a tin radical can form deoxy sugars or, in the presence of acrylonitrile, C-branched sugars at C-3 such as 34 [37, 38] according to Scheme 17. 

A commercially available polystyryldiphenylphosphine has been used to convert 3 -azido-3 -deoxy-nucleosides into the corresponding 3 -amino-3 deoxy-nucleosides, by formation and hydrolysis of phosphine imine intermediates. The formation of heterocyclic compounds on photolysis of glycosyl azides is covered in Section 6, and the formation of unsaturated sugars by radical elimination of vicinal phenyl selenide and xanthate azides from i ropriate saturated compounds is covered in Chapter 13. 

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