作者:Yury E. Tsvetkov、Nikolay E. Nifantiev
DOI:10.1055/s-2005-868514
日期:——
It has been shown that O-chloroacetyl protecting groups enhance significantly sialylating activity of 2-thioethyl sialosides in model reactions of α(2-8)-sialylation. Ethyl 4,7,8,9-tetra-O-chloroacetyl-3,5-dideoxy-2-thio-5-trifluoroacetamido-d-glycero-α-d-galacto-non-2-ulopyranoside that combines electron-withdrawing O-chloroacetyl and N-trifluoroacetyl protecting groups displayed the best reactivity and enabled the most efficient synthesis of the Neu5Acα(2-8)Neu5Ac dimer. The GD3 tetrasaccharide was synthesized in stepwise manner using this sialyl donor in the key (2-8)-coupling, albeit the yield was noticeably lower than in the model sialylation of monosaccharide acceptors.
研究表明,O-氯乙酰保护基团显著提高了2-巯乙基唾液酸苷在α(2-8)-唾液酸化模型反应中的活性。乙基4,7,8,9-四-O-氯乙酰-3,5-二脱氧-2-硫-5-三氟乙酰胺基-d-甘油-α-d-半乳糖-壬-2-烯呋喃糖苷结合了吸电子的O-氯乙酰和N-三氟乙酰保护基团,展现出最佳的反应活性,并实现了Neu5Acα(2-8)Neu5Ac二聚体的最高效合成。通过使用这种唾液酸供体,以分步方式合成了GD3四糖,尽管其产率明显低于单糖受体的模型唾液酸化反应。