Direct, stereoselective thioglycosylation enabled by an organophotoredox radical strategy
作者:Peng Ji、Yueteng Zhang、Feng Gao、Fangchao Bi、Wei Wang
DOI:10.1039/d0sc04136j
日期:——
transfer pathway have dictated glycosylation development, the direct glycosylation of readily accessible glycosyl donors as radical precursors is particularly appealing because of high radical anomeric selectivity and atom- and step-economy. However, the development of the radical process has been challenging owing to notorious competing reduction, elimination and/or SN side reactions of commonly used
虽然涉及 2e -转移途径的策略决定了糖基化的发展,但由于自由基异头选择性高以及原子和步骤经济性,易于获得的糖基供体作为自由基前体的直接糖基化特别有吸引力。然而,由于常用的不稳定糖基供体的竞争性还原、消除和/或 S N副反应,自由基过程的发展一直充满挑战。在这里,我们介绍了一种有机光催化策略,通过光氧化还原介导的 HAT 催化,糖基溴可以有效地转化为相应的异头自由基,无需过渡金属或导向基团,并实现高度异头选择性。温和的反应条件能够合成具有挑战性的α-1,2-顺式硫代糖苷、各种官能团的耐受性以及常见戊糖和己糖的广泛底物范围,证明了该平台的强大功能。此外,这种通用方法与 sp 2和 sp 3硫亲电子试剂以及总共探测的 50 种底物的后期糖基多样化兼容。
GLYCOSYL DONOR, PREPARATION METHOD THEREFOR, AND USE THEREOF
申请人:SICHUAN UNIVERSITY
公开号:US20220127239A1
公开(公告)日:2022-04-28
A glycosyl donor represented by formula (I) is used for preparing an S-glycoside compound represented by formula (III), an O-glycoside compound represented by formula (V), and a C-glycoside compound represented by formula (V). The glycosyl donor is a raw material in the preparation of O-glycoside, S-glycoside, and C-glycoside compounds by means of a free radical reaction, most of which have a special α configuration.
[EN] NOVEL GLYCOSYL DONOR, PREPARATION METHOD THEREFOR, AND USE THEREOF<br/>[FR] NOUVEAU DONNEUR DE GLYCOSYLE, PROCÉDÉ DE PRÉPARATION CORRESPONDANT ET UTILISATION ASSOCIÉE<br/>[ZH] 一种新的糖基供体及其制备方法和用途
Iodonium promoted reactions of disarmed thioglycosides
作者:Peter Konradsson、Uko E. Udodong、Bert Fraser-Reid
DOI:10.1016/s0040-4039(00)97609-3
日期:1990.1
High throughput screening of O-glycosylation conditions
作者:Akihiro Ishiwata、Yukishige Ito
DOI:10.1016/j.tetlet.2005.03.066
日期:2005.5
We report a novel methodology for rapid and quantitative screening of O-glycosylation reactions of application to the analysis of parallel reaction systems. Our system exploits perdeuterated benzyl (Bn-d(7)) ether, and stereoselectivity and yield are evaluated by H-1 NMR and MALDI-TOF MS, respectively. This paper summarizes over 240 screenings of 1 -> 3 linkage formation between glucose residues targeting the alpha-isomer in high yield. (c) 2005 Elsevier Ltd. All rights reserved.