ArticleChemistry (Weinheim an der Bergstrasse, Germany)2026
N-Aryl Acridone Derivatives as Effective Catalysts for Energy Transfer Reactions.
Article in Chemistry (Weinheim an der Bergstrasse, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Organic photocatalysts capable of promoting high-energy triplet energy transfer (EnT) remain limited, particularly for demanding [2+2] photocycloaddition reactions. In this study, we report the use of readily accessible N-aryl acridones as efficient visible-light-driven organic photocatalysts for challenging EnT processes. Although largely unexplored in photocatalysis, acridone derivatives exhibit photophysical properties suitable for sensitizing substrates with high triplet energies. Using N-Boc-indole-2-methyl ester and coumarin as representative high-triplet-energy substrates, we demonstrate that N-aryl acridones effectively mediate [2+2] cycloadditions under mild conditions via an energy-transfer mechanism. The modular acridone scaffold enables straightforward structural modification through N-functionalization, allowing systematic tuning of electronic and steric parameters to optimize catalytic performance.
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