118266-82-3

Upstream product

• 130144-08-0 methyl 2-O-(6-O-acetyl-2,3,4-tri-O-benzyl-α-D-glucopyranosyl)-3-O-benzyl-4,6-O-benzyliden-α-D-glucopyranoside 
• 87470-73-3 phenyl 2,3,4-tri-O-benzyl-1-thio-β-D-glucopyranoside 
• 120403-27-2 phenyl 6-O-acetyl-2,3,4-tri-O-benzyl-1-thio-β-D-glucopyranoside 

Downstream Products

• 130050-87-2 methyl O-(3,4,6-tri-O-acetyl-2-chloroacetamido-2-deoxy-β-D-glucopyranosyl)-(1->6)-O-(2,3,4-tri-O-benzyl-α-D-glucopyranosyl)-(1->2)-3-O-benzyl-4,6-O-benzylidene-α-glucopyranoside 

Relevant academic research and scientific papers

Use of the methylsulfenyl cation as an activator for glycosylation reactions with alkyl (aryl) 1-thioglycopyranosides: synthesis of methyl O-(2-acetamido-2- deoxy-beta-D-glucopyranosyl)-(1----6)-O-alpha-D-glucopyranosyl-(1----2) -alpha-D -glucopyranoside, a derivative of the core trisaccharide of E. coli K12.

Methylsulfenyl bromide (MSB) and methylsulfenyl trifluoromethanesulfonate (MST) have been used to prepare 1,2-cis-linked disaccharides. Ethyl (phenyl) 1-thio-beta-D-gluco- and galacto-pyranosides having non-participating (benzyloxy) protecting groups were used as the donors. The alpha beta-ratio of the products depended on the promoter and conditions of reaction. Intimate ion-pairs, formed initially, may be responsible for the steric outcome of the glycosylations. Thus, with ethyl 2,3,4,6-tetra-O-benzyl-alpha-D-mannopyranoside as a donor, moderate quantities of the beta-linked disaccharide could be produced using MSB as the activator. The synthesis of the title trisaccharide glycoside that contains 1,2-cis and 1,2-trans-linkages is described.