Indium-Mediated Stereoselective Synthesis of Truncated, 6- and 7-Carbon Sialic Acids
作者:Wolf-Dieter Fessner、Mathias Warwel
DOI:10.1055/s-2002-35564
日期:——
Several 6- and 7-carbon sialic acid derivatives were synthesized, without tedious protecting group manipulations, in high overall yields. A key step of the synthesis was the chain extension of suitable α-amino aldehyde derivatives by an indium-mediated addition of ethyl 2-(bromomethyl)acrylate. Under acidic reaction conditions, the corresponding extended enoates were obtained with high trans-stereoselectivity. Ozonolysis furnished the desired 4-acylamino-substituted hexulosonic and heptulosonic acids in free form for biochemical studies.
我们合成了几种 6 碳和 7 碳的硅酸衍生物,无需繁琐的保护基操作,而且总产率很高。合成的一个关键步骤是通过铟介导的 2-(溴甲基)丙烯酸乙酯加成法对合适的δ-氨基醛衍生物进行链延伸。 在酸性反应条件下,以高反式-立体选择性获得了相应的扩展烯酸盐。 臭氧分解以游离形式产生了所需的 4-酰氨基取代的己酮磺酸和庚酮磺酸,可用于生化研究。