Synthesis 2022; 54(15): 3307-3316
DOI: 10.1055/a-1822-4690
short review

Research Progress on N-Heterocyclic Carbene Catalyzed Reactions for Synthesizing Ketones through Radical Mechanism

Dan-Hong Wan
,
Hai-Bin Yang
This work was sponsored by financial support from the 100 Young Talents Programme of Guangdong University of Technology (No. 220413292).


Abstract

NHC-catalyzed radical cross-coupling reactions have been recently developed; they provide an efficient method to access ketones from aldehydes or carboxylic acid derivatives with sp3-hybridized carbon radical precursors. This reaction has indirectly solved the limitations in the scope of coupling partners in NHC umpolung catalyzed reactions of aldehydes. In this short review, we present some recent advances in NHC-catalyzed radical reactions, with a focus on the construction of the C–C(CO) bond.

1 Introduction

2 Oxidative Generation of NHC-Derived Ketyl Radical

2.1 NHPI Redox-Active Esters

2.2 Katritzky Pyridinium Salts

2.3 Alkyl Halides

2.4 Aryl Halides

2.5 Compounds Containing N–O Bond

2.6 Diazo Esters

2.7 Others

3 Reductive Generation of NHC-Derived Ketyl Radical

3.1 Hantzsch Esters

3.2 Sulfinates

3.3 Electron-Rich Arenes

3.4 Amines

3.5 Organoborane Reagents

4 Conclusion



Publikationsverlauf

Eingereicht: 14. März 2022

Angenommen nach Revision: 11. April 2022

Accepted Manuscript online:
11. April 2022

Artikel online veröffentlicht:
09. Juni 2022

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