Synthesis of Glycosyl Chlorides and Bromides by Chelation Assisted Activation of Picolinic Esters under Mild Neutral Conditions
作者:Peng Wen、Christopher J. Simmons、Zhi-xiong Ma、Stephanie A. Blaszczyk、Paul G. Balzer、Wenjing Ye、Xiyan Duan、Hao-Yuan Wang、Dan Yin、Christopher M. Stevens、Weiping Tang
DOI:10.1021/acs.orglett.0c00078
日期:2020.2.21
formation of glycosyl chlorides and bromides from picolinic esters under mild and neutral conditions. Benchtop stable picolinic esters are activated by a copper(II) halide species to afford the corresponding products in high yields with a traceless leaving group. Rare β glycosyl chlorides are accessible via this route through neighboring group participation. Additionally, glycosyl chlorides with labile protecting
已经开发了在温和和中性条件下由吡啶甲酸酯形成糖基氯化物和溴化物的通用方法。台式稳定的吡啶甲酸酯被卤化铜(II)物种活化,以高收率提供具有无痕离去基团的相应产品。通过邻族参与,可通过此途径获得稀有的β糖基氯。另外,可以制备具有先前不易获得的具有不稳定保护基的糖基氯化物。