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Deazaalloxazines - Flavin Derivatives That Provide Reductive Photoredox Catalysis with Inert Substrates.

Ivana Weisheitelová1, Naisargi Varma2, Ludmila Šimková3

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Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 20, 2025
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New 5-deazaalloxazines act as potent photocatalysts for challenging reductions. These compounds exhibit low reduction potentials, enabling efficient photoredox catalysis for inert substrates and various synthetic transformations.

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Area of Science:

  • Organic Chemistry
  • Photocatalysis
  • Synthetic Methodology

Background:

  • Reductive transformations are crucial in organic synthesis but challenging for photoredox catalysis.
  • Existing catalysts like flavins have limitations with "inert" substrates.
  • Developing new photocatalysts with enhanced reductive power is essential.

Purpose of the Study:

  • To introduce and investigate 5-deazaalloxazines as novel photocatalysts.
  • To evaluate their photophysical and electrochemical properties.
  • To demonstrate their utility in model photoreduction reactions.

Main Methods:

  • Synthesis and characterization of 31 5-deazaalloxazine derivatives.
  • Electrochemical analysis to determine reduction potentials.
  • Photophysical studies including absorption and photostability.
  • Testing in model photoreduction reactions like photodehalogenation and C-P coupling.

Main Results:

  • Identified 5-deazaalloxazines with reduction potentials as low as -1.65 V vs. SCE.
  • Selected 1,3-dimethyl-7,8-dimethoxy-5-(o-tolyl)-5-deazaalloxazine [3a(o-MePh)] for its high efficiency, photostability, and visible light absorption.
  • Demonstrated successful photodehalogenation of p-fluoroanisole using a 400 nm LED.
  • Showcased applicability in C-P coupling reactions and amine deprotection.

Conclusions:

  • 5-Deazaalloxazines are effective photocatalysts for challenging reductive transformations.
  • The developed catalysts enable visible-light-driven reactions with high efficiency.
  • These findings expand the scope of photoredox catalysis for synthetic applications.