648
3
Chemical Glycosylation Reactions
⊡ Scheme 81
Stereocontrolled synthesis of glycosyl 1-carboxylates and 1-phosphates
7 equiv. of phosphoric acid or dibenzyl phosphate in DMF led to the corresponding α-glycosyl phosphates 480 and 481, respectively. The same donors are also capable of transferring
glucopyranosyl (e. g. 467, > Scheme 81d) and galactopyranosyl units to UDP-free acid 482,
to afford the corresponding uridine 5 diphosphosugars (e. g. 483) in one step [229].
3
Chemical Glycosylation Reactions
⊡ Scheme 81
Stereocontrolled synthesis of glycosyl 1-carboxylates and 1-phosphates
7 equiv. of phosphoric acid or dibenzyl phosphate in DMF led to the corresponding α-glycosyl phosphates 480 and 481, respectively. The same donors are also capable of transferring
glucopyranosyl (e. g. 467, > Scheme 81d) and galactopyranosyl units to UDP-free acid 482,
to afford the corresponding uridine 5 diphosphosugars (e. g. 483) in one step [229].