Synthesis of Polycyclic Benzofused Nitrogen Heterocycles via a Tandem Ynamide Benzannulation/Ring-Closing Metathesis Strategy. Application in a Formal Total Synthesis of (+)-FR900482
作者:Xiao Yin Mak、Aimee L. Crombie、Rick L. Danheiser
DOI:10.1021/jo2000308
日期:2011.3.18
variety of functionalized substituents at the position ortho to the nitrogen. In the second stage of the tandem strategy, ring-closing metathesis generates the nitrogen heterocyclic ring. This two-step sequence provides efficient access to highly substituted dihydroquinolines, benzazepines, benzazocines, and related benzofused nitrogen heterocyclic systems. The application of this chemistry in a concise
描述了用于合成苯并稠合氮杂环的两阶段“串联策略”,特别适用于构建在苯环上具有高取代度的系统。该策略的第一阶段涉及基于环丁烯酮与炔酰胺反应的苯环化。该级联过程通过一系列四个周环反应进行,并提供多取代的苯胺衍生物,该衍生物可以在氮邻位带有多种官能化取代基。在串联策略的第二阶段,闭环复分解生成氮杂环。这种两步序列提供了对高度取代的二氢喹啉、苯并氮杂、苯并佐辛和相关苯并稠合氮杂环系统的有效访问。