An Expeditious Synthesis ofN-Acetylneuraminic Acid α-C-Glycosyl Derivatives (“α-C-Glycosides”) from the Anomeric Acetates
作者:Adeline Malapelle、Anna Coslovi、Gilles Doisneau、Jean-Marie Beau
DOI:10.1002/ejoc.200700181
日期:2007.7
efficiently with carbonyl compounds under Barbier conditions, providing a fast synthesis of C-ketosides. The α- and β-acetates are equally effective, and excellent yields are obtained for coupling with cyclic ketones. The procedure has been conveniently applied to the synthesis of a C-ketoside of N-acetylneuraminic acid with an attached linker, ready to use as a building block in the elaboration of
在没有任何添加剂的情况下,通过二碘化钐对甲基 N-乙酰神经氨酸 3a 和 3b 的容易获得的全乙酰化衍生物进行还原金属化,生成相应的异头钐 (III) 有机金属化合物。这些中间体在 Barbier 条件下与羰基化合物有效反应,提供 C-酮苷的快速合成。α- 和 β- 乙酸酯同样有效,并且与环酮偶联可获得出色的产率。该程序已方便地应用于合成带有连接子的 N-乙酰神经氨酸的 C-酮苷,可随时用作构建多价生物探针的构建块。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)