Direct and Stereoselective Synthesis of α-Linked 2-Deoxyglycosides
作者:Jin Park、Thomas J. Boltje、Geert-Jan Boons
DOI:10.1021/ol801833n
日期:2008.10.2
alpha-Linked 2-deoxyglycosides were conveniently obtained by employing a glycosyl donor having a participating ( S)-(phenylthiomethyl)benzyl moiety at C-6, whereas 2,6-dideoxy-alpha-glycosides could be prepared by BF 3.Et 2O-promoted activation of allyl glycosyl donors.
Stereoelectronic Effects Determine Oxacarbenium vs β-Sulfonium Ion Mediated Glycosylations
作者:Thomas J. Boltje、Jin-Hwan Kim、Jin Park、Geert-Jan Boons
DOI:10.1021/ol1027267
日期:2011.1.21
Activation of a glycosyl donor protected with a 2-O-(S)-(phenylthiomethyl)benzyl ether chiral auxiliary results in the formation of an anomeric beta-sulfonium ion, which can be displaced with sugar alcohols to give corresponding a-glycosides. Sufficient deactivation of such glycosyl donors by electron-withdrawing protecting groups is, however, critical to avoid glycosylation of an oxacarbenium ion intermediate. The latter type of glycosylation pathway can also be suppressed by installing additional substituents in the chiral auxiliary.
Bortolini, O.; Furia, F. di; Licini, G., Phosphorus and Sulfur and the Related Elements, 1988, vol. 37, p. 171 - 174
作者:Bortolini, O.、Furia, F. di、Licini, G.、Modena, G.