Oxidative Synthesis of α-Ketoamides

α-Ketoamides represent a privileged structural motif in both natural products and pharmaceutically active compounds, combining the electrophilic character of a keto group with the hydrogen‐bonding potential of an amide. Their versatility underpins applications ranging from enzyme inhibitors to building blocks in complex molecular architectures. Traditional approaches to their assembly have often required pre‐functionalised substrates or harsh conditions that limit substrate scope and functional‐group tolerance. By contrast, oxidative synthesis strategies exploit readily available precursors—such as alcohols, carboxylic acids or simple ketones—and molecular oxygen or air as the terminal oxidant. Recent advances have focused on the development of metal‐catalysed and organocatalysed protocols that proceed under mild conditions, offer high selectivity and can be executed in one‐pot or multicomponent formats. Mechanistic investigations, including isolation of reactive intermediates and computational studies, have revealed pathways involving radical or ionic oxidation events, decarboxylation and key insertion steps. These innovations enable late‐stage functionalisation of complex scaffolds, scalability for gram‐scale production and streamlined access to diverse α-ketoamide libraries. Emerging applications extend to the synthesis of protease inhibitors, metabolic probes and macrocyclic frameworks, underscoring the global significance of green, selective oxidative methods in modern synthetic chemistry.

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Oxidative Synthesis of α-Ketoamides publication trend

The graph below shows the total number of articles in oxidative synthesis of α-ketoamides across all publications each year (not limited to Nature Index journals).

Technical terms

α-Ketoamide: A molecule containing a carbonyl (C=O) adjacent to an amide (–CONH–) functionality, valued for its electrophilicity and hydrogen‐bonding properties.

Oxidative synthesis: A strategy that employs an oxidant—commonly molecular oxygen or air—to convert substrates into more highly oxidised products, enabling formation of carbonyl groups.

Decarboxylative acylation: A reaction in which a carboxylic acid loses CO₂ under catalytic conditions to generate an acyl species that subsequently couples with a nucleophile.

Isocyanide insertion: A process in which an isocyanide (R–NC) is incorporated into a metal or radical intermediate, leading to formation of amide or related functionalities upon subsequent transformations.

Multicomponent reaction: A single‐pot process that combines three or more reactants to form a product incorporating elements of each, enhancing efficiency and atom economy.

References

1. De Novo Synthesis of α‐Ketoamides via Pd/TBD Synergistic Catalysis. Advanced Science (2024).
2. Silver-Catalyzed Decarboxylative Acylation of Isocyanides Accesses to α-Ketoamides with Air as a Sole Oxidant. Molecules (2023).
3. Selective Synthesis of N-[1,3,5]Triazinyl-α-Ketoamides and N-[1,3,5]Triazinyl-Amides from the Reactions of 2-Amine-[1,3,5]Triazines with Ketones. Molecules (2023).
4. The Alpha Keto Amide Moiety as a Privileged Motif in Medicinal Chemistry: Current Insights and Emerging Opportunities. Journal of Medicinal Chemistry (2021).