Assembly of Digitoxin by Gold(I)-Catalyzed Glycosidation of Glycosyl <i>o</i>-Alkynylbenzoates
作者:Yuyong Ma、Zhongzhen Li、Hefang Shi、Jian Zhang、Biao Yu
DOI:10.1021/jo201850z
日期:2011.12.2
Digitoxin, a clinically important cardiac trisactharicle, was assembled efficiently from digitoxigenin and 3,4-di-O-tert-butyldiphenylsilyl-D-digitoxosyl o-cyclopropylethynyl-benzoate in 9 steps and 52% overall yield via alternate glycosylation and protecting group manipulation. The present synthesis showcases the advantage of the gold(I)-catalyzed glycosylation protocol in the synthesis of glycoconjugates containing acid-labile 2-deoxysugar linkages.