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This research aims to develop a method for synthesizing diverse N-heterocycle-fused porphyrins using a novel cascade annulation technique.

Denitrogenative Annulation of Benzotriazoyl Porphyrins: Synthesis of Diverse N-Heterocycle-Fused Porphyrinoids with Enhanced NIR Absorption

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This research aims to develop a method for synthesizing diverse N-heterocycle-fused porphyrins using a novel cascade annulation technique.
Utilized benzotriazolyl-appended porphyrins as starting materials.
Employed diglyme as the solvent for the reaction.
Conducted metal-free synthesis to produce N-heterocycle-fused porphyrinoids.
Synthesis yielded diverse N-heterocycle-fused porphyrins with good yields.
Produced porphyrins showed red-shifted absorption spectra.
Demonstrated significant singlet oxygen generation ability (ΦΔ ≈ 0.73).
Achieved narrow band gap of approximately 1.84 eV.

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Cascade annulation creates diverse N-heterocycle-fused porphyrins, indicating improved near-IR absorption characteristics.

Taur et al. (2026) studied this question.

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