Site-Selective and Stereoselective <i>O</i>-Alkylation of Glycosides by Rh(II)-Catalyzed Carbenoid Insertion
作者:Jicheng Wu、Xiaolei Li、Xiaotian Qi、Xiyan Duan、Weston L. Cracraft、Ilia A. Guzei、Peng Liu、Weiping Tang
DOI:10.1021/jacs.9b11262
日期:2019.12.18
most prevalent trans-1,2-diols in various pyranoses can be systematically and predictably differentiated based on the model derived from DFT calculations. We also demonstrated that the selective O-alkylation method could significantly improve the efficiency and stereoselectivity of glycosylation reactions. The alkyl groups introduced to carbohydrates by OH insertion reaction can serve as functional
General Strategy for the Synthesis of Rare Sugars via Ru(II)-Catalyzed and Boron-Mediated Selective Epimerization of 1,2-<i>trans</i>-Diols to 1,2-<i>cis</i>-Diols
作者:Xiaolei Li、Jicheng Wu、Weiping Tang
DOI:10.1021/jacs.1c13399
日期:2022.3.2
Although several methods have been developed for the synthesis of rare monosaccharides, most of them involve lengthy steps. Herein, we report an efficient and general strategy that can provide access to rare sugars from commercially available common monosaccharides via a one-step Ru(II)-catalyzed and boron-mediated selective epimerization of 1,2-trans-diols to 1,2-cis-diols. The formation of boronate esters