Revisiting the Armed−Disarmed Concept: The Importance of Anomeric Configuration in the Activation of S-Benzoxazolyl Glycosides
摘要:
The unexpectedly high reactivity of a (2-benzoxazolyl) per-O-benzoyl-beta-D-thioglucoside and related donors in reactions promoted by copper(II) trifluoromethanesulfonate is revealed, by comparison with the unreactive alpha-anomer, to be the result of neighboring group participation. Revision of the armed-disarmed concept for glycosyl donors is not required.
<i>S</i>-Benzoxazolyl as a Stable Protecting Moiety and a Potent Anomeric Leaving Group in Oligosaccharide Synthesis
作者:Medha N. Kamat、Cristina De Meo、Alexei V. Demchenko
DOI:10.1021/jo071191s
日期:2007.8.31
As a part of a program for developing new versatile building blocks for stereoselective glycosylation and convergent oligosaccharide synthesis, we demonstrated that S-benzoxazolyl (SBox) glycosides are stable toward major protecting group manipulations employed in carbohydrate chemistry. On the other hand, they can be glycosidated under relatively mild reaction conditions to afford either 1,2-trans
Glycosyl Alkoxythioimidates as Complementary Building Blocks for Chemical Glycosylation
作者:Sneha C. Ranade、Sophon Kaeothip、Alexei V. Demchenko
DOI:10.1021/ol1023079
日期:2010.12.17
It is reported that S-glycosyl O-methyl phenylcarbamothioates (SNea carbamothioates) have a fully orthogonal character in comparison to S-benzoxazolyl (SBox) glycosides. This complete orthogonality was revealed by performing competitive glycosylation experiments in the presence of various promoters. The results obtained indicate that SNea carbamothioates have a very similar reactivity profile to that of glycosyl thiocyanates, yet are significantly more stable and tolerate selected protecting group manipulations. These features make the SNea carbamothioates new promising building blocks for further utilization in