Modifying the glycosidic linkage in digitoxin analogs provides selective cytotoxins
作者:Joseph M. Langenhan、Jeffery M. Engle、Lauren K. Slevin、Lindsay R. Fay、Ryan W. Lucker、Kyle R. Smith、Matthew M. Endo
DOI:10.1016/j.bmcl.2007.11.058
日期:2008.1
A chemoselective reaction between oxyamines and unprotected, unactivated reducing sugars was used to construct for the first time a panel of linkage-diversified neoglycosides. This panel of digitoxin analogs included potent and selective tumor cytotoxins; cytotoxicity was dependent on the structure of the glycosidic linkage. These results validate linkage diversification through neoglycosylation as a unique and simple strategy to powerfully complement existing methods for the optimization of glycoconjugates. (c) 2007 Elsevier Ltd. All rights reserved.
Influence of Sugar Amine Regiochemistry on Digitoxigenin Neoglycoside Anticancer Activity
作者:Jianjun Zhang、Larissa V. Ponomareva、Nitin S. Nandurkar、Yaxia Yuan、Lei Fang、Chang-Guo Zhan、Jon S. Thorson
DOI:10.1021/acsmedchemlett.5b00120
日期:2015.10.8
The synthesis of a set of digitoxigenin neogluco/xylosides and corresponding study of their anticancer SAR revealed sugar amine regiochemistry has a dramatic effect upon activity. Specifically, this study noted sugar 3-amino followed 1 by 4-amino-substitution to be most advantageous where the solvent accessibility of the appended amine within neoglycoside-Na+,K+-ATPase docked models correlated with increased anticancer potency. This study presents a preliminary model for potential further warhead optimization in the context of antibody-directed steroidal glycosides and extends the demonstrated compatibility of aminosugars in the context of neoglycosylation.