Superarming Common Glycosyl Donors by Simple 2-<i>O</i>-Benzoyl-3,4,6-tri-<i>O</i>-benzyl Protection
作者:Hemali D. Premathilake、Laurel K. Mydock、Alexei V. Demchenko
DOI:10.1021/jo9021474
日期:2010.2.19
A complementary concept for superarming glycosyldonors through the use of common protecting groups was previously discovered with S-benzoxazolyl (SBox) glycosyldonors. As this strategy can be of benefit to existing oligosaccharide methodologies, it has now been expanded to encompass a wide array of common, stableglycosyldonors. The versatility of this developed technique has been further illustrated
Application of the Superarmed Glycosyl Donor to Chemoselective Oligosaccharide Synthesis
作者:Laurel K. Mydock、Alexei V. Demchenko
DOI:10.1021/ol800648d
日期:2008.6.5
discovered a novel method for "superarming" glycosyldonors. Herein, this concept has been exemplified in one-pot oligosaccharidesyntheses, whereby the superarmed glycosyldonor was chemoselectively activated over traditional "armed" and disarmed glycosyl acceptors. Direct side-by-side comparison of the reactivities of the classic armed and superarmed glycosyldonors further validates the credibility of
Expedient Synthesis of Superarmed Glycosyl Donors via Oxidative Thioglycosidation of Glycals
作者:Alexei V. Demchenko、Nicholas P. Forsythe、Emma R. Mize、Gustavo A. Kashiwagi
DOI:10.1055/a-2183-0175
日期:2024.4
protecting group pattern gives rise to increased reactivity due to an O-2/O-5 cooperative effect. Despite having a high reactivity profile and applicability in many expeditious strategies for glycan synthesis, regioselective introduction of the superarming protecting group pattern is tedious for most sugar series. Reported herein is a streamlined synthetic route to yield superarmed glycosyl donors of
Superarming the <i>S</i>-Benzoxazolyl Glycosyl Donors by Simple 2-<i>O</i>-Benzoyl-3,4,6-tri-<i>O</i>-benzyl Protection
作者:Laurel K. Mydock、Alexei V. Demchenko
DOI:10.1021/ol800345j
日期:2008.6.5
The strategic placement of common protecting groups led to the discovery of a new method for "superarming" glycosyl donors. Conceptualized from our previous studies on the O-2/O-5 Cooperative Effect, it was determined that S benzoxazolyl glycosyl donors possessing both a participating moiety at C-2 and an electronically armed lone pair at O-5, such as the superarmed glycosyl donor shown above, were exceptionally reactive.