Imino-bridged heterocycles. III . Synthesis of mono-bridgehead substituted 11H-benzo[5,6]cyclohepta[1,2-c]pyridin-6,11-imines by regiospecific amine to olefin cyclizations
作者:Daniel G. Brenner、Wasyl Halczenko、Kenneth L. Shepard
DOI:10.1002/jhet.5570220269
日期:1985.3
amine to endocyclic olefin and hydroxylamine to exocyclic olefin cyclizations, we have developed pathways to two isomeric, bridgehead methyl-substituted benzo[5,6]cyclohepta[1,2-c]pyridin-6,11-imines. Acid catalyzed cyclization of 5 to 6 was accomplished under exceedingly mild conditions (silica gel/chloroform), whereas, thermal cyclization of 20 to generate 21 was performed analogously to the dibenzo[a
我们利用环内胺对内环烯烃和羟胺对环外烯烃的环化作用,我们已经开发出了通往两个异构的桥头甲基取代的苯并[5,6]环庚[1,2-c]吡啶-6,11-亚胺的途径。在极温和的条件下(硅胶/氯仿)完成了5至6的酸催化环化反应,而类似于二苯并[ a,d ]环庚-5,10-亚胺体系,则进行了20的热环化反应以生成21。