β-Selective Arabinofuranosylation Using a 2,3-O-Xylylene-Protected Donor
摘要:
Reported is a novel stereoselective beta-arabinofuranosylation that makes use of a conformationally restricted 2,3-O-zylylene-protected arabinofuranosyl donor. Optimization of the reaction conditions showed that factors including the structure of the acceptor alcohol, substrate concentration, and protecting group on O-5 of the donor affect the stereochemical outcome of the glycosylation. To demonstrate the utility of the methodology, the synthesis of an oligosaccharide fragment from the mycobacterial cell wall polysaccharide lipoarabinomannan was carried out.
β-Selective Arabinofuranosylation Using a 2,3-<i>O</i>-Xylylene-Protected Donor
作者:Akihiro Imamura、Todd L. Lowary
DOI:10.1021/ol101520q
日期:2010.8.20
Reported is a novel stereoselective beta-arabinofuranosylation that makes use of a conformationally restricted 2,3-O-zylylene-protected arabinofuranosyl donor. Optimization of the reaction conditions showed that factors including the structure of the acceptor alcohol, substrate concentration, and protecting group on O-5 of the donor affect the stereochemical outcome of the glycosylation. To demonstrate the utility of the methodology, the synthesis of an oligosaccharide fragment from the mycobacterial cell wall polysaccharide lipoarabinomannan was carried out.
Stereocontrolled Synthesis of α-Xylofuranosides Using a Conformationally Restricted Donor
作者:Li Zhang、Ke Shen、Hashem A. Taha、Todd L. Lowary
DOI:10.1021/acs.joc.8b00410
日期:2018.8.3
the use of thioglycoside donors possessing a conformationally restricting xylylene protecting group. The method was shown to provide the desired targets in good to excellent yield and stereoselectivity. Computational investigations support the proposal that the protecting group locks the electrophilic intermediate in these reactions into a conformation that leads to the high selectivity. The power