Propargyl Glycosides as Stable Glycosyl Donors: Anomeric Activation and Glycoside Syntheses
作者:Srinivas Hotha、Sudhir Kashyap
DOI:10.1021/ja062425c
日期:2006.8.1
The advantages of stable glycosyl donors for saccharide coupling are many, and we describe herein the utility of propargyl glycosides for anomeric activation and glycoside synthesis exploiting the alkynophilicity of AuCl3. Various aglycones were reacted with propargyl glycosides, resulting in the formation of an α,β-mixture of glycosides and disaccharides in good yields.
Dissection of the effects that govern thioglucoside and thiomannoside reactivity
作者:Mads Heuckendorff、Lulu Teressa Poulsen、Christinne Hedberg、Henrik H. Jensen
DOI:10.1039/c7ob02968c
日期:——
Neighboringgroupeffects were investigated in gluco- and manno-configured thioglycosides under NIS/TfOH activation. Donors possessing a 2-O-benzoyl group that are capable (1,2-trans) and incapable (1,2-cis) of exerting nucleophilic push were compared with donors possessing a participatory neutral 2-O-benzyl group. By using competition experiments between sets of glycosyl donors the direct effect of