Synthesis 2023; 55(21): 3470-3486
DOI: 10.1055/a-2134-0307
special topic
C–H Bond Functionalization of Heterocycles

Carbon–Carbon Bond Forming Reactions in Diazines via Transition-Metal-Catalyzed C–H Bond Activation

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Financial support from the Agence Nationale de la Recherche (ANR-19-CE07-0039), Centre National de la Recherche Scientifique (CNRS), and University of Rennes is acknowledged.


Abstract

An overview of the key achievements concerning C–C bond-forming processes with diazines (pyridazines, pyrimidines, and pyrazines) and benzodiazines (cinnolines, phthalazines, quinazolines, and quinoxalines) under transition-metal-catalyzed C–H activation is presented. The focus is on examples in which C–H functionalization takes place in the diazine or benzodiazine core because of the relevance of these compounds in material science and as active pharmaceutical ingredients. These metal-catalyzed protocols benefit from the biased reactivity of the C–H bonds targeted or from the presence of a rationally designed directing group proximate to the C–H bond to be functionalized. As such, innovative alkylations, alkenylations, alkynylations, arylations, and carboxylations are accomplished within such skeletons in a step- and atom-economy fashion.

1 Introduction

2 Transition-Metal-Catalyzed C–H Alkylation of Diazines

3 Transition-Metal-Catalyzed C–H Alkynylation of Diazines

4 Transition-Metal-Catalyzed C–H Alkenylation of Diazines

5 Transition-Metal-Catalyzed C–H Arylation of Diazines

6 Transition-Metal-Catalyzed C–H Carboxylation of Diazines

7 Conclusion



Publication History

Received: 22 May 2023

Accepted after revision: 20 July 2023

Accepted Manuscript online:
20 July 2023

Article published online:
12 September 2023

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