Catalytic Activation of Amide Bonds in Organic Synthesis

Amide bonds are among the most ubiquitous linkages in natural products, pharmaceuticals and polymers, yet their inherent resonance stabilisation renders them remarkably inert to conventional reaction conditions. Catalytic activation of amide bonds seeks to overcome this kinetic barrier by employing tailored catalysts or reagents to selectively cleave or transform the C–N or C–O bonds under mild conditions. Strategies range from transition-metal catalysis—using nickel, palladium or other base metals supported by specialised ligands—to transition-metal-free approaches utilising organocatalysts or strong Lewis acids. Such innovations have unlocked new pathways for amide transamidation, decarbonylative coupling, cross-coupling with boron or organozinc reagents, and late-stage functionalisation of complex molecules. The global significance of these methods lies in their potential to streamline the synthesis of active pharmaceutical ingredients, agrochemicals and functional materials while reducing waste and avoiding harsh reagents. Recent advances have demonstrated that subtle ligand design, transient activating groups and precise mechanistic control can enable transformations that were once deemed infeasible, thereby expanding the synthetic toolbox for amide-containing scaffolds across diverse sectors.

Research from Nature Portfolio

One seminal contribution introduced a two-step nickel-catalysed protocol for secondary amide transamidation, in which Boc-activation of the amide weakens the C–N bond and a non-precious metal catalyst subsequently effects bond cleavage and re-formation under remarkably mild conditions. A complementary study described a transition-metal-free transamidation and ester amidation carried out at ambient temperature with non-nucleophilic amines, offering an operationally simple and environmentally benign alternative to metal-based systems. In another advance, a nickel/N-heterocyclic carbene system was shown to mediate decarbonylative elimination of aliphatic amides to olefins via C–N and C–C bond cleavage, enabling late-stage olefination and highlighting the versatility of base-metal catalysis for challenging amide substrates.

Catalytic Activation of Amide Bonds in Organic Synthesis publication trend

The graph below shows the total number of articles in catalytic activation of amide bonds in organic synthesis across all publications each year (not limited to Nature Index journals).

Technical terms

Amide bond activation: Strategies to transform typically inert amide C–N or C–O bonds via catalytic or chemical means.

Transamidation: Exchange of one amide moiety for another through cleavage and reformation of the C–N bond.

Decarbonylation: Removal of a carbonyl group (CO) from an acyl substrate, enabling formation of new C–C or C–H bonds.

Cross-coupling: Catalytic coupling of two fragments, often involving an organometallic nucleophile and an electrophile under metal catalysis.

N-heterocyclic carbene (NHC): Strongly donating ligand that stabilises low-valent metal centres, enhancing catalytic activation of inert bonds.

References

1. A two-step approach to achieve secondary amide transamidation enabled by nickel catalysis. Nature Communications (2016).
2. Highly selective transition-metal-free transamidation of amides and amidation of esters at room temperature. Nature Communications (2018).
3. Nickel-catalysed retro-hydroamidocarbonylation of aliphatic amides to olefins. Nature Communications (2017).
4. Distinguishing Competing Mechanistic Manifolds for C(acyl)–N Functionalization by a Ni/N‑Heterocyclic Carbene Catalyst System. JACS Au (2023).
5. Suzuki–Miyaura cross-coupling of amides and esters at room temperature: correlation with barriers to rotation around C–N and C–O bonds. Chemical Science (2017).
6. Nickel-catalyzed transamidation of aliphatic amide derivatives. Chemical Science (2017).