Umpolung Reactivity in the Stereoselective Synthesis of S-Linked 2-Deoxyglycosides
作者:Kedar N. Baryal、Danyang Zhu、Xiaohua Li、Jianglong Zhu
DOI:10.1002/anie.201301682
日期:2013.7.29
Take control! An unprecedented sulfenylation of stereochemically defined 2‐deoxyglycosyl lithium species with asymmetric sugar‐derived disulfide acceptors enabled the stereoselectivesynthesis of both α‐ and β‐S‐linked 2‐deoxyoligosaccharides. Reductive lithiation of 2‐deoxyglycosyl phenylsulfides at −78 °C provides predominantly axial glycosyl lithium species, which upon warming isomerize to predominantly