Intramolecular Glycosidation by Click Reaction Mediated Spacer Generation Followed by Spacer Cleavage
作者:Amit Kumar、Yiqun Geng、Richard R. Schmidt
DOI:10.1002/ejoc.201201076
日期:2012.12
glycosidation with N-iodosuccinimide/trifluoromethansulfonic acid as the activating system afforded β-(1–3)- and α-(1–2)-linked disaccharides as part of 14-membered macrocycles. Descriptors for these reactions are proposed that consider the donor and acceptor attachment sites and the stereochemistry of the functional groups. Investigation of the influence of 2-O-linked 1-aryl-1,2,3-triazol-4-ylmethyl
具有连位羟基的 2-O-炔丙基取代的糖基供体和 O-(2-叠氮基苄基)-取代的受体容易进行点击反应。以 N-碘代琥珀酰亚胺/三氟甲磺酸为激活系统的分子内糖苷化得到 β-(1-3)- 和 α-(1-2)-连接的二糖,作为 14 元大环的一部分。提出了这些反应的描述,考虑供体和受体连接位点以及官能团的立体化学。对包含在间隔基中的 2-O-连接的 1-芳基-1,2,3-三唑-4-基甲基基团对异头异构选择性的影响的研究表明没有嵌合辅助。此外,还表明间隔基团在 Birch 还原条件下很容易裂解。