Photocatalytic Synthesis of Isoquinoline Derivatives

Isoquinoline and its fused analogues represent a privileged class of nitrogen heterocycles with widespread applications in medicinal chemistry, natural‐product synthesis and materials science. Traditional routes to these frameworks often rely on strong acids, transition‐metal catalysts or forcing thermal conditions, limiting functional‐group compatibility and sustainability. Photocatalytic strategies harness visible‐light absorption to generate reactive radical or energy‐transfer intermediates, enabling C–H activation, cycloaddition and annulation sequences under mild conditions. Key mechanistic paradigms include photoredox catalysis—where an excited catalyst shuttles single electrons to or from substrates—and photocycloaddition via direct excitation or energy‐transfer. These methods have unlocked concise, regioselective access to a broad spectrum of isoquinoline derivatives, featuring diverse substituents at multiple positions and offering streamlined entry into biologically important scaffolds. The mild reaction settings, use of organic dyes or inexpensive semiconductor materials, and compatibility with green solvents underscore the growing potential of photocatalysis to transform heterocyclic synthesis and support sustainable process development.

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Photocatalytic Synthesis of Isoquinoline Derivatives publication trend

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

Technical terms

Photocatalysis: The acceleration of a chemical reaction by a catalyst that absorbs light and enters an excited state, enabling new reaction pathways.

Photoredox catalysis: A subtype of photocatalysis in which an excited catalyst mediates single‐electron transfer to generate radical intermediates.

Isoquinoline: A bicyclic nitrogen heterocycle composed of a benzene ring fused to a pyridine ring, serving as a core in many natural products and pharmaceuticals.

Annulation: A synthetic process that forms a new ring by creating two or more bonds in a single operation, often used to build heterocyclic systems.

References

1. Visible-light photoredox catalyzed synthesis of pyrroloisoquinolines via organocatalytic oxidation/[3 + 2] cycloaddition/oxidative aromatization reaction cascade with Rose Bengal. Beilstein Journal of Organic Chemistry (2014).