Heterocycles Synthesis by (Cross)‐Dehydrogenative Coupling

Abstract

Heterocyclic compounds are ubiquitous in nature and constitute the backbone of many naturally occurring and synthetic organic compounds having a broad spectrum of biological and pharmacological activities. Due to the importance of this class of compounds, the development of straightforward, efficient, atom‐economical, and eco‐friendly synthesis of various heterocyclic compounds has always drawn considerable attention. Among the different available synthetic methodologies, the cross‐dehydrogenative coupling (CDC) reactions represent one of the most efficient and straightforward approaches, which do not require the time‐consuming multistep prefunctionalization of starting precursors. In this article, we concentrated on various CDC approaches for the synthesis of different heterocyclic compounds. Both transition metal‐catalyzed and ‐free methodologies developed over the past decades have been summarized.