S-Glycosylation
3.5
675
⊡ Scheme 29
⊡ Scheme 30
⊡ Scheme 31
2.1.7 From Anhydro Sugars
Similar to glycosides, anhydro derivatives involving the anomeric oxygen, which can be considered as internal glycosides, can also be cleaved by a Lewis acid in the presence of a thiol, or a TMS-derivative thereof, to give thioglycosides. Examples with 1,2- and 1,6-anhydro