Further Anomeric Esters
3.3
559
⊡ Scheme 78
(Ref. [93])
⊡ Scheme 79
(Ref. [94])
method for the synthesis of 2-deoxyglycosides by employing CB 2-deoxyglycosides as glycosyl donors, in which glycosylation of the 4,6-O-benzylidene-protected glycosyl donor with
secondary alcohols afforded predominantly β-glycosides whereas glycosylation of the benzylprotected glycosyl donor with secondary alcohols afforded α-glycosides ( > Scheme 77) [92].
They also established a reliable and generally applicable direct method for the stereoselective
β-arabinofuranosylation employing CB tri-O-benzylarabinoside as the glycosyl donor, in
3.3
559
⊡ Scheme 78
(Ref. [93])
⊡ Scheme 79
(Ref. [94])
method for the synthesis of 2-deoxyglycosides by employing CB 2-deoxyglycosides as glycosyl donors, in which glycosylation of the 4,6-O-benzylidene-protected glycosyl donor with
secondary alcohols afforded predominantly β-glycosides whereas glycosylation of the benzylprotected glycosyl donor with secondary alcohols afforded α-glycosides ( > Scheme 77) [92].
They also established a reliable and generally applicable direct method for the stereoselective
β-arabinofuranosylation employing CB tri-O-benzylarabinoside as the glycosyl donor, in