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.
A PIM2 analogue suppresses allergic airway disease
作者:Jacquie L. Harper、Colin M. Hayman、David S. Larsen、Gavin F. Painter、Gurmit Singh-Gill
DOI:10.1016/j.bmc.2010.11.058
日期:2011.1
Two approaches for the synthesis of a phosphatidylinositol dimannoside (PIM2) analogue 4 that mimics the suppressive activity of natural PIMs and also synthetic PIM2 have been developed. This analogue, where the inositol core was replaced by glycerol, was tested for its ability to suppress cellular inflammation in a mouse model of allergic asthma and shown to be effective in suppressing airway eosinophilia. Suppression of all inflammatory cells monitored was observed, indicating a general blockade of cellular activity. These data indicate that the inositol core is not essential for this suppressive activity. (C) 2010 Elsevier Ltd. All rights reserved.
Stereoselective Synthesis of α-Glycosyl Phosphites and Phosphoramidites via <i>O</i>-Selective Glycosylation of <i>H</i>-Phosphonate Derivatives
作者:Fumiko Matsumura、Natsuhisa Oka、Takeshi Wada
DOI:10.1021/ol802190x
日期:2008.11.20
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.