Isoquinolinium N-arylimides and acetylenic dipolarophiles; cycloadducts and their rearrangements
作者:Klaus Bast、Tony Durst、Helmut Huber、Rolf Huisgen、Klaus Lindner、David S Stephenson、Robert Temme
DOI:10.1016/s0040-4020(98)00430-x
日期:1998.7
ones and does not require acid catalysis; in some cases the initial adduct escapes 1H NMR observation. The products 11–17, obtained with ethyl phenylpropiolate, provide beautiful NMR models for steric interaction of benzo ring E and the 12-phenyl group. On treatment with strong acid, the pentacyclic rearrangement products suffer fragmentation; e.g., 11 furnishes 4-(o-aminophenyl)-isoquinoline and methyl
乙炔二甲基丙炔酸盐,和乙基苯基丙超越在dipolarophilic活动相应的烯属羧酸酯VS。异喹啉鎓N-芳基酰亚胺,一类甲亚胺亚胺。所述cycloadducts含有Ñ ß -vinylphenylhydrazine系统并进入一个Fischer吲哚合成,其停止所述吲哚中的一个步骤短。炔属双极性亲和剂的环加合物所涉及的[3.3]-σ重排同样快于烯属双极性亲和剂,并且不需要酸催化。在某些情况下,最初的加合物无法通过1 H NMR观察到。产品11–17用苯丙酸乙酯获得的,为苯并环E和12-苯基的空间相互作用提供了漂亮的NMR模型。用强酸处理时,五环重排产物会碎裂。例如,11在甲醇HCl中提供4-(邻氨基苯基)-异喹啉和苯甲酰乙酸甲酯。