Stereoselective Synthesis of α-Glycosyl Phosphites and Phosphoramidites via O-Selective Glycosylation of H-Phosphonate Derivatives
摘要:
A highly stereo- and chemoselective glycosylation of H-phosphonate derivatives with glycosyl iodides was discovered as a reverse reaction of the formation of a glycosyl iodide from a glycosyl phosphite and I- under mild acidic conditions. Further study on the unique reaction showed that the reaction provided various alpha-glycosyl phosphites; and phosphoramidites in a highly stereoselective manner with complete O-selectivity.
Glycosylation of alcohols using glycosyl boranophosphates as glycosyl donors
摘要:
A novel glycosylation that uses glycosyl boranophosphate triesters as glycosyl donors and trityl cation (Tr+) as an activator was developed. Two types of reactions were studied: (1) the boranophosphate triester was activated with TrNTf2 to react with an alcohol and (2) O-trityl ethers worked as both glycosyl acceptors and Tr+ sources. The latter gave better results and the desired O-glycosylation products were rapidly generated and isolated in moderate to good yields. (C) 2013 Elsevier Ltd. All rights reserved.
[EN] SYNTHETIC MOLECULES HAVING IMMUNE ACTIVITY<br/>[FR] MOLECULES SYNTHETIQUES A IMMUNO-ACTIVITE
申请人:MALAGHAN INST OF MEDICAL RES
公开号:WO2005049631A1
公开(公告)日:2005-06-02
The present invention is directed to synthetic molecules having biological activity similar to PIM (acyl glycerol phosphatidylinositol manno-oligosaccharide) activity, for use in the treatment and prevention of inflammatory or immune cell mediated diseases or disorders.
The present invention is directed to synthetic molecules having biological activity similar to PIM (acyl glycerol phosphatidylinositol manno-oligosacccharide) activity, for use in the treatment and prevention of inflammatory or immune cell mediated diseases or disorders.
Glycosylation using glycosyl phosphites as glycosyl donors in the presence of a Lewis acid such as ZnCl2 or ZnCl2-AgClO4 has afforded the glycosides including sialoglycosides in good yields.
Regiospecific Synthesis of 2,6-Di-<i>O</i>- (α-<scp>d</scp>-mannopyranosyl)phosphatidyl-<scp>d</scp>-<i>myo</i>- inositol