Work

Photochemical Flow Synthesis of Trisubstituted Oxazoles Enabled by High-Power UV–B LED Modules

Year: 2025

Type: article

Abstract: The use of a newly developed UV-B LED module for the continuous flow synthesis of a variety of trisubstituted oxazole products from readily available isoxazoles is reported. Crucially, this work demonstrates for the first time that these UV-LED modules (up to 40 W electrical power) are effective replacements of classical medium-pressure Hg-lamps by providing monochromatic light (centered at 308 nm) which facilitates the highlighted photochemical process. The desired oxazole products are afforded in high yields, and the applicability toward synthesizing analogs of the anti-inflammatory drug oxaprozin at multigram scale is reported. The availability of such high-power UV-LED modules not only circumvents the use of inefficient metal vapor lamps but also highlights new opportunities for light-driven processes in general.

Source: Organic Letters

DOI: 10.1021/acs.orglett.5c03241

Authors: Ruairi Crawford, Rémy Broersma, Frouke van den Berg, Marcus Baumann

Institutions: University College Dublin, Signify (Netherlands)

Language: English

Topic: Radical Photochemical Reactions

Subfield: Organic Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,500

Funders: Irish Research eLibrary, Irish Research Council, Engineering and Physical Sciences Research Council, European Regional Development Fund