Protecting Group Dependence of Stereochemical Outcome of Glycosylation of 2-<i>O</i>-(Thiophen-2-yl)methyl Ether Protected Glycosyl Donors
作者:Andrew J. A. Watson、Stewart R. Alexander、Daniel J. Cox、Antony J. Fairbanks
DOI:10.1002/ejoc.201600071
日期:2016.3
A series of glycosyl donors possessing a (thiophen-2-yl)methyl ether protecting group at position 2 were synthesised and the effect of the protecting group pattern of other hydroxyls on the stereochemical outcome of glycosylation was investigated. Studies revealed optimal α-selectivity for glycosylation using a fully armed tri-benzylated donor, whilst other protecting group patterns were significantly
Application of Glycosyl Thioimidates in Solid-Phase Oligosaccharide Synthesis
作者:M. Cristina Parlato、Medha N. Kamat、Haisheng Wang、Keith J. Stine、Alexei V. Demchenko
DOI:10.1021/jo701902f
日期:2008.3.1
S-benzoxazolyl (SBox) and S-thiazolinyl (STaz) glycosides, were investigated as glycosyl donors for solid-phaseoligosaccharidesynthesis. It was demonstrated that these derivatives are suitable for both glycosyl acceptor-bound and glycosyl donor-bound strategies, commonly employed in resin-supported oligosaccharidesynthesis.
Levene; Tipson, Journal of Biological Chemistry, 1938, vol. 125, p. 355,360
作者:Levene、Tipson
DOI:——
日期:——
Glycosylation Using Unprotected Alkynyl Donors
作者:Sreeman K. Mamidyala、M.G. Finn
DOI:10.1021/jo901857x
日期:2009.11.6
Gold(III) activation of unprotected propargyl glycosyl donors has been shown to be effective for the synthesis of saccharides. Terminal propargyl glycosides of glucose, galactose, and mannose required heating at reflux in acetonitrile with 5% AuCl(3) for reaction with various primary alcohol acceptors, the latter used in 10-fold molar excess relative to donor. Donors containing the 2-butynyl group were more reactive, giving good yields of glycoside products at lower temperatures Secondary alcohols could also be used but with diminished efficiency. The propargylic family of donors is especially convenient because they can be easily prepared on large scale by Fischer glycosylation and stored indefinitely before chemoselective activation by the catalyst.