Synthesis of the Azaoxoaporphine Alkaloid Sampangine and Ascididemin-Type Pyridoacridines through TMPMgCl·LiCl-Mediated Ring Closure
作者:Alois Plodek、Mathias König、Franz Bracher
DOI:10.1002/ejoc.201403502
日期:2015.2
We report the synthesis of the azaoxoaporphine alkaloid sampangine (4) and a series of ring A analogues and isomers of the marine pyridoacridine alkaloid ascididemin (2). This approach starts from readily available 1-bromo[2,7]naphthyridine (12) or 4-bromobenzo[c][2,7]naphthyridine (5), and the ring A scaffold bearing an ester moiety is introduced by a Suzuki or Negishi cross-coupling reaction. The
我们报告了 azaoxoaporphine 生物碱 sampangine (4) 和一系列海洋吡啶并吖啶生物碱 ascididemin (2) 的 A 环类似物和异构体的合成。这种方法从容易获得的 1-溴[2,7] 萘啶 (12) 或 4-溴苯并[c][2,7] 萘啶 (5) 开始,并且带有酯部分的环 A 支架由 Suzuki 或Negishi 交叉偶联反应。最后的环化步骤是通过使用 Knochel-Hauser 碱(TMPMgCl·LiCl;TMP = 2,2,6,6-四甲基哌啶基)进行定向远程环金属化,然后分子内捕获酯基来实现的。