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Synthesis of Polycyclic Benzofused Nitrogen Heterocycles via a Tandem Benzannulation/Ring-Closing Metathesis Strategy. Application in a Formal Synthesis of (+)-

机译:通过串联苯并环化/闭环复分解策略合成多环苯并氮杂环化合物。在(+)的形式合成中的应用 -

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摘要

A two-stage “tandem strategy” for the synthesis of benzofused nitrogen heterocycles is described that is particularly useful for the construction of systems with a high level of substitution on the benzenoid ring. The first stage in the strategy involves abenzannulation based on the reaction of cyclobutenones with ynamides. This cascade process proceeds via a sequence of four pericyclic reactions and furnishes a multiply substituted aniline derivative which can bear a variety of functionalized substituents at the position ortho to the nitrogen. In the second stage of the tandem strategy, ringclosing 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 formal total synthesis of the anticancer agents (þ)-FR900482 and (þ)-FR66979 is described.
机译:描述了用于合成苯并稠合氮杂环的两阶段“串联策略”,该方法对于构建在苯环上具有高取代度的体系特别有用。该策略的第一阶段涉及基于环丁烯酮与酰胺的反应的苯并氮杂化。该级联过程通过四个周环反应的顺序进行,并提供了一个多取代的苯胺衍生物,该衍生物可以在氮的邻位带有各种官能化的取代基。在串联策略的第二阶段,闭环复分解生成氮杂环。这两个步骤的序列可有效访问高度取代的二氢喹啉,苯并ze庚因,苯并偶氮辛和相关的苯并稠合氮杂环系统。描述了该化学方法在简明的正式全合成抗癌剂(I)-FR900482和(I)-FR66979中的应用。

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