Deoxy sugars terminal, synthesis

Synthesis of zwitterionic l,l -glycosylphosphodiester (60) comprising anomeric centers of two 2-amino-2-deoxy-sugars and coupled to maleimide-activated bovine serum albumin (BSA) via an amide-linked thiol-terminated spacer group, has been achieved using i -phosphonate (58) or phosphoramidite (59) approaches (Scheme 16). ... 

However, it is rather difficult to search a library of natural sugars for an appropriate sugar derivative for the synthesis of 30. It is necessary to find either 5-deoxy-L-arabinose (61) or 5-deoxy-L-ribose (62), neither of which is available from natural resources [69]. Chemical derivation from easily available sugars is the only way to obtain 61 and 62,however, simple deoxygenation of the terminal alcohol group from L-arabinose (63) and L-ribose (64) generally requires a multi-step process. For example, the deoxygenative transformation... 

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