Synthesis 2022; 54(09): 2081-2102
DOI: 10.1055/a-1701-7397
review

Recent Advances in Palladium-Catalyzed Oxidative Couplings in the Synthesis/Functionalization of Cyclic Scaffolds Using Molecular Oxygen as the Sole Oxidant

Amanda Aline Barboza
,
Juliana Arantes Dantas
,
Mateus Oliveira Costa
,
Attilio Chiavegatti
,
Guilherme Augusto de Melo Jardim
,
We are grateful for financial support in the form of funding and fellowships provided by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (São Paulo Research Foundation) (Grant Nos. 2014/50249-8, 2020/10246-0, 2020/01255-6), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (Coordination for the Improvement of Higher Education Personnel) (Finance Code 001), the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (The Brazilian National Council for Scientific and Technological Development) and GlaxoSmithKline (GSK).


Abstract

Over the past years, Pd(II)-catalyzed oxidative couplings have enabled the construction of molecular scaffolds with high structural diversity via C–C, C–N and C–O bond-forming reactions. In contrast to the use of stoichiometric amounts of more common oxidants, such as metal salts (Cu and Ag) and benzoquinone derivatives, the use of molecular oxygen for the direct or indirect regeneration of Pd(II) species presents itself as a more viable alternative in terms of economy and sustainability. In this review, we describe recent advances on the development of Pd-catalyzed oxidative cyclizations/functionalizations, where molecular oxygen plays a pivotal role as the sole stoichiometric oxidant.

1 Introduction

2 Oxidative C–C and C–Nu Coupling

2.1 Intramolecular Oxidative C–Nu Heterocyclization Reactions

2.1.1 C–H Activation

2.1.2 Wacker/Aza-Wacker-Type Cyclization

2.1.3 Tandem Wacker/Aza-Wacker and Cyclization/Cross-Coupling Reactions

2.2 Intermolecular Oxidative C–Nu Heterocoupling Reactions

2.3 Intramolecular Oxidative (C–C) Carbocyclization Reactions

2.4 Intermolecular Oxidative C–C Coupling Reactions

2.4.1 Cyclization Reactions

2.4.2 Cross-Coupling Reactions

2.4.3 Homo-Coupling Reactions

3 Aerobic Dehydrogenative Coupling/Functionalization

4 Oxidative C–H Functionalization

5 Summary



Publication History

Received: 15 September 2021

Accepted after revision: 19 November 2021

Accepted Manuscript online:
19 November 2021

Article published online:
25 January 2022

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