Synthesis ofβ-D-Galp-(1?4)-β-D-GlcpNAc-(1?2)-α-D-Manp-(1?O)(CH2)7CH3 Mimics to Explore the Substrate Specificity of Sialyltransferases andtrans-Sialidases
作者:John A. F. Joosten、Britta Evers、Ruben P. van Summeren、Johannis P. Kamerling、Johannes F. G. Vliegenthart
DOI:10.1002/ejoc.200300293
日期:2003.9
β-D-Galp-(1⇄4)-β-D-GlcpNAc-(1⇄2)-α-D-Manp-(1⇄O)(CH2)7CH3 (1) designed for detailed exploration of the acceptor specificity of α-2,3- and α-2,6-sialyltransferases as well as trans-sialidases, have been synthesised: β-D-Galp-(1⇄4)-β-D-GlcpNPr-(1⇄2)-α-D-Manp-(1⇄O)(CH2)7CH3 (2), β-D-Fucp-(1⇄4)-β-D-GlcpNR-(1⇄2)-α-D-Manp-(1⇄O)(CH2)7CH3 (3, R = Ac; 4, R = Pr), 6-amino-6-deoxy-β-D-Galp-(1⇄4)-β-D-GlcpNR-(1⇄2)-α-
所有三糖都是通过基于亚胺酸酯或硫糖苷的适当修饰的糖基供体与单个二糖受体辛基(3,6-二-O-苄基-2-脱氧-2-邻苯二甲酰亚胺-β-D-吡喃葡萄糖基)-(1⇄2 )-3,4,6-tri-O-苄基-α-D-吡喃甘露糖苷,然后去保护。对于含有 N-酰化葡糖胺以及 N-酰化半乳糖胺单元的三糖,使用 N-邻苯二甲酰和 N-二甲基马来酰保护的组合。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) 使用了 N-邻苯二甲酰基和 N-二甲基马来酰基保护的组合。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) 使用了 N-邻苯二甲酰基和 N-二甲基马来酰基保护的组合。(© Wiley-VCH Verlag GmbH & Co. KGaA,