Issue 16, 2025

Visible-light-driven copper(ii) catalysis for 2,3-disubstituted quinazolinone synthesis via Ullmann N-arylation and C–H oxidative amidation

Abstract

A novel visible-light-driven method for the synthesis of 2,3-disubstituted quinazolinones has been developed, employing copper(II) as a catalyst in a sequential Ullmann N-arylation and C–H oxidative amidation process. This methodology utilizes o-iodo-N-substituted benzamides and benzylamines as substrates, with molecular oxygen sourced from ambient air functioning as the oxidant. The reaction is conducted under mild conditions, utilizing cost-effective copper(II) chloride as the catalytic agent and Eosin Y as a photosensitizer, facilitated by blue LED irradiation. A broad compatibility with various substrates is demonstrated, yielding products in the range of 30% to 84%. Additionally, mechanistic studies elucidate a single-electron transfer pathway that incorporates aryl radical intermediates. This research presents a sustainable and efficient strategy for the synthesis of quinazolinones, with considerable synthetic and mechanistic implications.

Graphical abstract: Visible-light-driven copper(ii) catalysis for 2,3-disubstituted quinazolinone synthesis via Ullmann N-arylation and C–H oxidative amidation

Supplementary files

Article information

Article type
Communication
Submitted
15 Jan 2025
Accepted
19 Mar 2025
First published
19 Mar 2025

Org. Biomol. Chem., 2025,23, 3800-3805

Visible-light-driven copper(II) catalysis for 2,3-disubstituted quinazolinone synthesis via Ullmann N-arylation and C–H oxidative amidation

A. Th. Abdulghaffar, P. Hu, Y. Hu, C. Liu, Y. Ren, Z. Cao, Y. Xu, M. Jiang and H. Xu, Org. Biomol. Chem., 2025, 23, 3800 DOI: 10.1039/D5OB00063G

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