Activation of thioglycosides under mild alkylation conditions
作者:Nicholas Forsythe、Leah Liu、Gustavo A. Kashiwagi、Alexei V. Demchenko
DOI:10.1016/j.carres.2023.108872
日期:2023.9
Reported herein is the development of a novel method for the activation of thioglycosides and thioimidates using benzyl trichloroacetimidate in the presence of catalytic triflic acid. Excellent yields have been achieved with reactive substrates, whereas efficiency of reactions with unreactive glycosyl donors and/or acceptors was modest.
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.