Synthesis and Glycosylation of a Series of 6-Mono-, Di-, and Trifluoro <i>S</i>-Phenyl 2,3,4-Tri-<i>O</i>-benzyl-thiorhamnopyranosides. Effect of the Fluorine Substituents on Glycosylation Stereoselectivity
作者:David Crich、Olga Vinogradova
DOI:10.1021/ja0730258
日期:2007.9.1
A series of 6-mono-, di-, and trifluoro analogs of S-phenyl 2,3,4-tri-O-benzyl-D- or L-thiorhamnopyranoside has been synthesized and used as donors in glycosylation reactions, with activation by the 1-benzenesulfinyl pipe ridine/triflic anhydride system. The stereochemical outcome of the glycosylation reactions was found to depend on the electron-withdrawing capability of the disarming substituent at the 6-position, i.e., on the number of fluorine atoms present. The results are explained with regard to the increased stability of the glycosyl triflates, shown to be intermediates in the reaction by low-temperature H-1 NMR experiments, with increased fluorine content.
Exploring anomeric glycosylation of phosphoric acid: Optimisation and scope for non-native substrates
作者:Laura Beswick、Sanaz Ahmadipour、Gert-Jan Hofman、Hannah Wootton、Eleni Dimitriou、Jóhannes Reynisson、Robert A. Field、Bruno Linclau、Gavin J. Miller
DOI:10.1016/j.carres.2019.107896
日期:2020.2
KHAN, SHAHEER H.;JAIN, RAKESH K.;ABBAS, SAEED A.;MATTA, KHUSHI L., CARBOHYDR. RES., 198,(1990) N, C. 259-273
作者:KHAN, SHAHEER H.、JAIN, RAKESH K.、ABBAS, SAEED A.、MATTA, KHUSHI L.