Synlett 2023; 34(07): 683-697
DOI: 10.1055/a-1890-8503
synpacts
Chemical Synthesis and Catalysis in India

Advances in the Iron-Catalyzed Direct Functionalizations of ­Heterocycles

Chandini Pradhan
a   Organometallic Synthesis and Catalysis Lab, Organic Chemistry Division, CSIR–National Chemical Laboratory (CSIR–NCL), Dr. Homi Bhabha Road, Pune - 411 008, India
b   Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
,
a   Organometallic Synthesis and Catalysis Lab, Organic Chemistry Division, CSIR–National Chemical Laboratory (CSIR–NCL), Dr. Homi Bhabha Road, Pune - 411 008, India
b   Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
› Author Affiliations
This work was financially supported by the Science and Engineering Research Board (SERB), New Delhi, India (CRG/2020/000554). C.P. thanks UGC, New Delhi for a research fellowship.


Abstract

Direct functionalization of heterocycles is an advanced strategy for diversifying privileged and biorelevant heterocycle-containing molecules. Particularly, use of the most abundant transition metal, iron, as a catalyst makes this process highly cost-effective and sustainable. Recently, some progress has been realized towards the direct functionalization of heterocycles under iron catalysis. Herein, we present the developments in the C–H bond functionalizations and related reactions of various heterocycles by abundant iron salts. This Synpacts is categorized into different sections based on heterocycles being functionalized, and each section is discussed based on the type of reaction catalyzed by iron.

1 Introduction

2 Functionalization of Indoles

2.1 Alkylation

2.2 Alkenylation

2.3 Other Reactions

3 Oxindoles and Isatins

3.1 C–C Bond Formation

3.2 C–Heteroatom Bond Formation

4 Pyridines and Furans

5 Functionalization of Azoles

6 Summary and Outlook



Publication History

Received: 02 June 2022

Accepted after revision: 03 July 2022

Accepted Manuscript online:
03 July 2022

Article published online:
28 July 2022

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