Several easy, efficient and convenient procedures to access indoles fused heterocyclic systems are described in this review. These heterocyclic systems were synthesized from several cyclic or acyclic molecules via a variety of reactions such as Diels-Alder reaction, Michael addition, Morita- Baylis-Hillmann reaction and many other domino/Cascade approaches with high selectivity. Most of the given protocols in this review proceed through organocatalytic pathways; however, some underwent different catalytic and non-catalytic reactions.

中文翻译：

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从简单分子合成吲哚融合复杂体系结构的多种途径

在这篇综述中描述了几种简单，高效和便捷的过程来获得吲哚稠合杂环系统。这些杂环系统是由数个环状或无环分子通过多种反应（例如Diels-Alder反应，Michael加成反应，Morita-Baylis-Hillmann反应和许多其他具有高选择性的多米诺/级联方法）合成的。在这篇综述中，大多数给定的方案都是通过有机催化途径进行的。然而，一些经历了不同的催化和非催化反应。