Divergent de novo synthesis of all eight stereoisomers of 2,3,6-trideoxyhexopyranosides and their oligomers
作者:Wangze Song、Yu Zhao、John C. Lynch、Hyunjin Kim、Weiping Tang
DOI:10.1039/c5cc07787g
日期:——
All eight possible stereoisomers of 2,3,6-trideoxyhexopyranosides are prepared systematically from furan derivatives by a sequence of Achmatowicz rearrangement, Pd-catalysed glycosidation, and chiral catalyst-controlled tandem reductions. This sequence provides access to...
De Novo Asymmetric Synthesis of an α-6-Deoxyaltropyranoside as Well as its 2-/3-Deoxy and 2,3-Dideoxy Congeners
作者:Mingde Shan、Yalan Xing、George A. O’Doherty
DOI:10.1021/jo9009722
日期:2009.8.21
A highly divergent de novo asymmetric synthesis of benzyl alpha-6-deoxyaltropyranoside, benzyl alpha-ascarylopyranoside, benzyl alpha-amicetopyranoside, and benzyl a-digitoxopyranoside has been achieved via I common pyranone intermediate. The routes rely upon it palladium(0)-catalyzed glycosylation reaction and corresponding post-glycosylation transformations, The control of the absolute and relative stereochemical configuration came from a Noyori reduction of 2-acylfuran and subsequent diastereoselective introduction of other stereogenic centers.