We describe the synthesis of mimetics of the α2â3 and α2â6 sialogalactoside substrates of influenza neuraminidase which include the oseltamivir pharmacophore, and report the sub-nanomolar affinities for these novel neuraminidase inhibitors. The challenge of synthesizing a Phospha-Oseltamivir/Tamiphosphor monoester involving the secondary 3-hydroxy group of galactose required to mimic the α2â3 sialogalactoside has been overcome by palladium-promoted coupling of the oseltamivir-derived vinyl iodide with a protected galactose-3-phosphonate. The difference in binding of these two inhibitors to a given influenza neuraminidase should be a function of its α2â3/α2â6-selectivity, an important, but not yet fully understood factor in the adaptation of highly pathogenic avian influenza viruses to human hosts.
我们描述了合成模仿流感
神经氨酸酶的α2–3和α2–6
唾液酸半
乳糖苷底物的化合物,包括
奥司他韦药效团,并报告了这些新型
神经氨酸酶抑制剂的亚纳摩尔亲和力。合成涉及半
乳糖的次级3-羟基所需的
磷酸奥司他韦/塔米福韦单酯的挑战,通过
钯促进的
奥司他韦衍生的
乙烯基碘与保护的半
乳糖-3-
磷酸酯的耦合得以克服。这两种
抑制剂与特定流感
神经氨酸酶的结合差异应取决于其α2–3/α2–6选择性,这是高度致病性禽流感病毒适应人类宿主中一个重要但尚未完全理解的因素。