A simple synthesis of the pentacyclic lamellarin skeleton from 3-nitro-2-(trifluoromethyl)-2H-chromenes and 1-methyl(benzyl)-3,4-dihydroisoquinolines
作者:Vladislav Yu. Korotaev、Vyacheslav Ya. Sosnovskikh、Alexey Yu. Barkov、Pavel A. Slepukhin、Marina A. Ezhikova、Mikhail I. Kodess、Yurii V. Shklyaev
DOI:10.1016/j.tet.2011.09.049
日期:2011.11
The basic structural framework of lamellarin alkaloids, 8,9-dihydro-6H-chromeno[4′,3′:4,5]pyrrolo[2,1-a]isoquinoline derivatives, has been obtained in good yields via Grob synthesis between 3-nitro-2-(trifluoromethyl)-2H-chromenes and 1-methyl-3,4-dihydroisoquinolines in refluxing isobutanol. In the case of 1-benzyl-3,4-dihydroisoquinolines, a dynamic NMR effect was observed in the 1H and 19F NMR spectra
层状生物碱的基本结构框架8,9-dihydro-6 H -chromeno [4',3':4,5] pyrrolo [2,1- a ] isoquinoline衍生物,已通过高产量的合成获得了之间在回流的异丁醇中的3-硝基-2-(三氟甲基)-2 H-色烯和1-甲基-3,4-二氢异喹啉。在1-苄基-3,4-二氢异喹啉的情况下,由于围绕连接苯环和杂环系统的单键的旋转受限,在产物的1 H和19 F NMR光谱中观察到了动态NMR效应。。当反应用3-硝基-2-(三氯甲基)-2进行ħ在室温下,将甲苯中的二甲基苯酮分离,仅分离出迈克尔加合物(两种非对映异构体的混合物)。