Prenylated β-diketones, two new additions to the family of biologically active Hypericum perforatum L. (Hypericaceae) secondary metabolites
作者:Niko S. Radulović、Marija S. Genčić、Nikola M. Stojanović、Pavle J. Randjelović、Nicolas Baldovini、Vanya Kurteva
DOI:10.1016/j.fct.2018.05.009
日期:2018.8
Two novel β-diketones, 2,6,9-trimethyl-8-decene-3,5-dione (A) and 3,7,10-trimethyl-9-undecene-4,6-dione (B), were identified from the renowned medicinal plant Hypericum perforatum L. The structures of β-diketones A and B were corroborated by syntheses (4 steps starting from methyl acetoacetate, overall yields 30% and 23%, respectively). In solution, these β-diketones predominantly exist as two rapidly
确定了两个新颖的β-二酮2,6,9-三甲基-8-癸烯-3,5-二酮(A)和3,7,10-三甲基-9-十一碳烯4,6,6-二酮(B)从著名的药用植物贯叶连翘L.β二酮的结构阿和乙通过合成证实了(4个步骤从乙酰乙酸甲酯,总收率分别为30%和23%,开始)。在溶液中,这些β-二酮主要以两种快速相互转化的β-酮-烯醇互变异构体的形式存在。A和B的结构分别显示了一些高蛋白和肾上腺素分子的共同片段,这是圣约翰草中公认的多靶标次级代谢产物。因此,A表现出值得注意的生物学活性也就不足为奇了(包括盐水虾的毒性,抗伤害性,抗抑郁和乙酰胆碱酯酶的抑制活性)。β-二酮A作为乙酰胆碱酯酶抑制剂表现出最出色的效能,IC 50值为1.51μM,再次表明β-酮-烯醇部分是开发可减轻阿尔茨海默氏病症状(例如痴呆,抑郁和疼痛)。