Synthesis of a New Series of Sialylated Homo- and Heterovalent Glycoclusters by using Orthogonal Ligations
作者:Gour Chand Daskhan、Carlo Pifferi、Olivier Renaudet
DOI:10.1002/open.201600062
日期:2016.10
(Neu5Ac), galactose (Gal), and/or N‐acetyl glucosamine (GlcNAc). We first used copper‐catalyzed azide–alkyne cycloaddition and/or thiol‐ene coupling to conjugate propargylated α‐sialic acid 3, β‐GlcNAc thiol 5, and β‐Gal thiol 6 onto cyclopeptide scaffolds 7–9 to prepare tetravalent homoglycoclusters (10–12) and hGCs (13–14) with 2:2 combinations of sugars. In addition, we have demonstrated that 1,2‐diethoxycyclobutene‐3
杂糖簇(hGCs)的合成由于其在糖生物学中的潜在应用而受到越来越多的关注。在本文中,我们报告了一种基于正交化学选择性连接的高效且直接的收敛方案,以制备结构明确的基于环肽的同价和异价糖缀合物,这些缀合物显示5 N N乙酰神经氨酸(Neu5Ac),半乳糖(Gal)和/或N-乙酰氨基葡萄糖(GlcNAc)。我们首先使用的铜催化的叠氮化物-炔烃环加成和/或硫醇-烯耦合到共轭propargylatedα唾液酸3,β-GlcNAc的硫醇5,和β-Gal的硫醇6到环肽支架7 - 9以制备四价homoglycoclusters(10 - 12)和HGCS(13 - 14)以2:糖的2种组合。此外,我们已经证明,1,2- diethoxycyclobutene -3,4-二酮可被用作二价接头,以制备各种八价HGCS(16,19,和20中从这些四价结构受控的方式)。