Development of a fluorescent probe for the study of the sponge-derived simplexide immunological properties
摘要:
Simplexide is a glycolipid of marine origin, endowed with immunological properties, composed of a long chain secondary alcohol glycosylated by an alpha-D-glucosyl-(1 -> 4)-beta-D-galactosyl disaccharide residue. Herein we describe the preparation of a fluorescent derivative of simplexide, labeled at position 6 of the distal glucose with a dansyl group, as a probe for future studies on the mechanism by which simplexide affects the immune system. Fluorescent simplexide was prepared from a 6 ''-amino functionalized compound, which in turn was obtained through a highly efficient glycosylation between the preformed activated disaccharide and the long chain secondary alcohol 18-pentatriacontanol. (C) 2011 Elsevier Ltd. All rights reserved.
Streamlined Iterative Assembly of Thio‐Oligosaccharides by Aqueous
<i>S</i>
‐Glycosylation of Diverse Deoxythio Sugars
作者:Peng Wen、Peijing Jia、Qiuhua Fan、Bethany J. McCarty、Weiping Tang
DOI:10.1002/cssc.202102483
日期:2022.2.8
Step by step: A streamlined practical iterative synthesis of S-oligosaccharides is developed in aqueous solution without the need of protecting any of the hydroxy groups. Various deoxythio sugar building blocks can be prepared efficiently. The Ca(OH)2-promoted aqueous S-glycosylation can be realized with high chemo- and stereoselectivity.
A new family of chiral C2 symmetric tetraazamacrocycles, coined ISAC for IminoSugar Aza-Crown, incorporating two iminosugars adopting a 4C1 conformation is disclosed. Multinuclear NMR experiments on the corresponding Cd2+ complex show that the ISAC is a strong chelator in water and its tetramine cavity adopts a conformation similar to that of the parent Cd–cyclam complex. Similar behavior is observed
公开了一种新的手性C 2对称四氮杂大环族,其为IminoSugar Aza-Crown的ISAC,结合了两个采用4 C 1构象的亚氨基糖。在相应的Cd 2+络合物上进行的多核NMR实验表明,ISAC在水中是很强的螯合剂,其四胺腔具有与母体Cd–cyclam络合物相似的构象。在溶液中使用Cu 2+可以观察到类似的行为,与Cu–cyclam配合物相比,稳定性更高。