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.
De novo asymmetric synthesis and biological analysis of the daumone pheromones in Caenorhabditis elegans and in the soybean cyst nematode Heterodera glycines
作者:Haibing Guo、James J. La Clair、Edward P. Masler、George A. O'Doherty、Yalan Xing
DOI:10.1016/j.tet.2016.03.033
日期:2016.5
The de novo asymmetric total syntheses of daumone 1, daumone 3 along with 5 new analogs are described. The key steps of our approach are: the diastereoselective palladium catalyzed glycosylation reaction; the Noyori reduction of 2-acetylfuran and an ynone, which introduce the absolute stereochemistry of the sugar and aglycon portion of daumone; and an Achmatowicz rearrangement, an epoxidation and a