Assembly of a β-(1 → 3)-glucan laminarihexaose on ionic liquid support
作者:Yanhui Wang、Xiaoke Zhao、Qiuyun Kong、Jiajian Yao、Xiangbao Meng、Zhongjun Li
DOI:10.1016/j.tetlet.2017.03.035
日期:2017.4
An efficientmethod for the preparation of β-(1 → 3)-d-glucan laminarihexaose on ionicliquid (IL)-support is described. A β-(1 → 3)-glucan laminarihexaose was rapidly assembled in 15 h in a stereoselective fashion with an average yield of over 90% per step using an optimized combination of glycosylating agents. This ionicliquid support approach provides an efficient and fast means for the assembly
Acid-selective mass spectrometric analysis of petroleum fractions
作者:Isaac Omari、Haoxuan Zhu、G. Bryce McGarvey、J. Scott McIndoe
DOI:10.1016/j.ijms.2018.10.029
日期:2019.1
Analytical massspectrometric methods aimed at carboxylic acids tend to involve deprotonation to generate carboxylate anions, but also produce detectable ions of every acidic component of the mixture. A charged tag carbodiimide is able to facilitate detection of model naphthenic acids as well as low levels of naphthenic acids in petroleum fractions via tandem electrospray ionization mass spectrometry
Assembly of Homolinear α(1→2)-Linked Nonamannoside on Ionic Liquid Support
作者:Qing Ma、Sheng Sun、Xiang-Bao Meng、Qing Li、Shu-Chun Li、Zhong-Jun Li
DOI:10.1021/jo2006126
日期:2011.7.15
An improved method for the synthesis of large and complex oligosaccharides on ionic liquid (IL) support was developed. A strategy to attach the acceptor on IL using a more stable ether linker was used to prevent undesirable decomposition and side products. A "dissolution-evaporation-precipitation" purification procedure was also developed by combining the advantages of precipitation and solid-liquid extraction to reduce mechanical loss and purification time. This approach was successfully used for the rapid assembly of ionic liquid supported homolinear alpha(1 -> 2)-linked nonamannoside in 25.2% overall yield within 28.5 h.
An efficient ionic liquid supported divergent assembly of 3,6-branched glucosamine-containing pentasaccharide
作者:Ze-Shen Gao、Sheng Sun、Wei Li、Qing Ma、Qing Li、Zhong-Jun Li
DOI:10.1016/j.cclet.2014.09.016
日期:2014.12
We utilized the glycosyl acceptor tagging method with ionic liquid support for synthesis of the core segment of Clostridium botulinum C2 toxin ligand through a divergent synthetic strategy without chromatographic purification. The total yield was 57.1% and the reaction was completed in 10 h. The efficient ionic liquid supported glycosylation and purification procedure was applied for the synthesis of branched glucosamine-containing oligosaccharides for the first time, which expanded the scope of ionic liquid supported synthesis of biologically important oligosaccharides. (C) 2014 Qing Li and Zhong-Jun Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.