New Syntheses of rac-Huperzine A and its rac-7-Ethyl-Derivative. Evaluation of Several Huperzine A Analogues as Acetylcholinesterase Inhibitors
作者:Pelayo Camps、Joan Contreras、Rachid El Achab、Jordi Morral、Diego Muñoz-Torrero、Mercè Font-Bardia、Xavier Solans、Albert Badia、Nuria M Vivas
DOI:10.1016/s0040-4020(00)00363-x
日期:2000.6
rac-Huperzine A, its rac-7-ethyl-derivative and two regioisomeric analogues have been prepared through synthetic sequences involving the elaboration of the pyridone ring in a late stage, by reaction of an intermediate pyrrolidine enamine with propiolamide, which gave mixtures of regioisomeric pyridone derivatives. The acetylcholinesterase inhibitory activity of these and two other recently described 11-unsubstituted
rac-石杉碱甲,其rac -7-乙基衍生物和两个区域异构体类似物是通过合成序列制备的,该过程涉及在后期阶段通过吡啶环烯胺中间体与丙醇酰胺的反应对吡啶酮环进行精制,从而得到区域异构体的混合物。吡啶酮衍生物。确定了这些化合物和其他两个最近描述的11个未取代的石杉碱A类似物的乙酰胆碱酯酶抑制活性,石杉碱A的rac -7-乙基类似物是活性最高的化合物,尽管其活性比(-)-低约12倍。石杉碱甲