Natural Product Synthesis of Bioactive Isocoumarins

The isocoumarin scaffold, characterised by a benzannulated 2-pyranone core, has attracted sustained interest owing to its diverse biological activities, including anti-inflammatory, antimicrobial, neuroprotective and cytotoxic properties. Natural product synthesis of bioactive isocoumarins encompasses both isolation from microbial, marine and plant sources and the development of chemical and chemoenzymatic routes to access structural analogues and stereoisomers. Advances in understanding polyketide biosynthesis have revealed modular enzyme assemblies that forge the isocoumarin nucleus from simple acyl-CoA precursors, enabling biocatalytic diversification. Parallel chemical approaches have focused on convergent cyclisation strategies, spiroketal installation and late-stage functionalisation to modulate pharmacological profiles. The interplay between detailed structural elucidation—often employing nuclear magnetic resonance and electronic circular dichroism—and iterative synthesis has underpinned the translation of these frameworks into promising lead compounds with therapeutic potential.

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Natural Product Synthesis of Bioactive Isocoumarins publication trend

The graph below shows the total number of articles in natural product synthesis of bioactive isocoumarins across all publications each year (not limited to Nature Index journals).

Technical terms

Isocoumarin: A bicyclic lactone comprised of a benzene ring fused to a 2H-pyran-2-one core, frequently encountered in fungal and plant metabolites.

Polyketide synthase (PKS): A multi-domain enzyme complex that constructs polyketide backbones by iterative condensation of acyl-CoA units.

Electronic circular dichroism (ECD): A chiroptical spectroscopic method measuring differential absorption of circularly polarised light, used to assign absolute stereochemistry.

Lactone: A cyclic ester formed when an alcohol and a carboxylic acid within the same molecule undergo intramolecular condensation.

Spiroketal: A structural motif featuring two rings connected through a single quaternary carbon, often introduced to enhance biological potency.

References

1. New Isocoumarins from the Marine Fungus Phaeosphaeriopsis sp. WP-26. Marine Drugs (2023).
2. Anti-Inflammatory Properties of Oxygenated Isocoumarins and Xanthone from Thai Mangrove-Associated Endophytic Fungus Setosphaeria rostrata. Molecules (2024).
3. Naturally Occurring Isocoumarins Derivatives from Endophytic Fungi: Sources, Isolation, Structural Characterization, Biosynthesis, and Biological Activities. Molecules (2020).