Catalytic Hydration of Nitriles to Amides

The catalytic hydration of nitriles to amides represents a cornerstone transformation in organic synthesis, converting readily available carbonitrile precursors into valuable amide products under relatively mild conditions. This reaction is essential for the production of pharmaceuticals, agrochemicals and polymer intermediates, as amide bonds are pervasive in both natural and synthetic bioactive molecules. Metal‐based catalysts—ranging from classical platinum and rhodium complexes to more recent palladium-arsenic or osmium polyhydride systems—can operate in homogeneous or heterogeneous modes, often achieving high selectivity and turnover frequencies at moderate temperatures and near‐neutral pH. Biocatalytic approaches employing nitrile hydratase enzymes offer complementary advantages in aqueous media, exceptional substrate specificity and minimal environmental impact. Key challenges in the field include broadening substrate scope, enhancing catalyst stability, minimising precious-metal loading and developing truly sustainable, metal-free or biomass-derived catalytic platforms. Advances in ligand design, support materials and mechanistic insight continue to drive innovation, enabling scale-up of fine chemical processes and integration with green solvents and continuous-flow technologies.

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Catalytic Hydration of Nitriles to Amides publication trend

The graph below shows the total number of articles in catalytic hydration of nitriles to amides across all publications each year (not limited to Nature Index journals).

Technical terms

Nitrile: An organic compound bearing a carbon–nitrogen triple bond (–C≡N).

Amide: An organic functional group featuring a carbonyl (C=O) directly bonded to a nitrogen atom (–CONH–).

Turnover frequency (TOF): The number of substrate molecules converted per catalyst site per unit time.

N-Heterocyclic carbene (NHC): A stable divalent carbon ligand used to stabilise metal centres in organometallic catalysts.

Nitrile hydratase (NHase): A metalloenzyme that catalyses the hydration of nitriles to amides under mild, aqueous conditions.

References

1. An unprecedented palladium-arsenic catalytic cycle for nitriles hydration. Frontiers in Chemistry (2023).
2. Hydration of Aliphatic Nitriles Catalyzed by an Osmium Polyhydride: Evidence for an Alternative Mechanism. Inorganic Chemistry (2021).
3. Selective Hydration of Nitriles to Corresponding Amides in Air with Rh(I)-N-Heterocyclic Complex Catalysts. Catalysts (2020).