Intramolecular Hydrofunctionalization in Organic Synthesis

Intramolecular hydrofunctionalization encompasses a suite of reactions in which a nucleophilic X–H bond within a molecule adds across an unsaturated carbon–carbon bond to form cyclic architectures. This strategy has become a cornerstone of modern synthetic design, enabling rapid assembly of oxygen‐, nitrogen‐ and sulphur‐containing heterocycles with high atom economy and minimal by-product formation. Catalytic approaches range from Brønsted acids and Lewis acids to transition-metal complexes and organocatalysts, each offering distinct modes of activation and selectivity. Mechanistic pathways may proceed via discrete carbocation intermediates, concerted polar additions or even radical processes, depending on the catalyst and substrate motif. Recent advances have extended the scope to challenging tetrasubstituted alkenes, enabled enantioselective variants and allowed stereodivergent ring closures. The ability to construct lactones, lactams, tetrahydrofurans, tetrahydropyrans and related cores under mild conditions makes intramolecular hydrofunctionalization a powerful tool for the synthesis of natural products, medicinal scaffolds and functional materials. As synthetic demands shift towards efficiency and sustainability, these transformations continue to evolve, offering ever greater control over chemo-, regio- and stereoselectivity.

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Intramolecular Hydrofunctionalization in Organic Synthesis publication trend

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

Technical terms

Intramolecular hydrofunctionalization: Addition of an internal X–H bond across an unsaturated C–C bond within a single molecule, forming cyclic structures.

Hydroalkoxylation: Addition of an O–H bond across an alkene or alkyne to generate ether linkages, often intramolecularly to afford oxygen heterocycles.

Lewis acid: Electron-pair acceptor catalyst that activates π bonds or heteroatoms, facilitating bond formation in hydrofunctionalization.

Brønsted acid: Proton donor catalyst that protonates substrates to induce electrophilic activation and promote nucleophilic addition.

Chemo-selectivity: The preference of a chemical reagent to react with one functional group in the presence of others under specified conditions.

Atom economy: A measure of the proportion of reactant atoms incorporated into the desired product, reflecting synthetic efficiency.

References

1. Tetrahydropyran synthesis mediated by catalytic triflic acid and hexafluoroisopropanol. Monatshefte für Chemie - Chemical Monthly (2024).
2. Substrate-Dependent Selectivity in Sc(OTf)3-Catalyzed Cyclization of Alkenoic Acids and N-Protected Alkenamides. Catalysts (2022).
3. Axially Chiral 1,1'‐Binaphthyl‐2‐Carboxylic Acid (BINA‐Cox) as Ligands for Titanium‐Catalyzed Asymmetric Hydroalkoxylation. European Journal of Organic Chemistry (2020).