Photochemical Bromination of 2,5‐Dimethylbenzoic Acid as Key Step of an Improved Alkyne‐Functionalized Blue Box Synthesis - Inria - Institut national de recherche en sciences et technologies du numérique Access content directly
Journal Articles European Journal of Organic Chemistry Year : 2023

Photochemical Bromination of 2,5‐Dimethylbenzoic Acid as Key Step of an Improved Alkyne‐Functionalized Blue Box Synthesis

Abstract

Cyclobis(paraquat-p-phenylene), also known as “blue box”, is a highly electron-deficient macrocycle, widely used as a molecular receptor for small electron-rich molecules. Inserting a reactive functional group onto the molecular structure of this cyclophane is paramount for its inclusion into complex architectures. To this aim, including an alkyne moiety would be ideal, because it can participate in click reactions. However, the synthesis of such alkyne-functionalized cyclophane suffers from several drawbacks: the use of toxic and expensive CCl4, the need for high-pressure reactors, and overall low yield. We have revised the existing synthesis of this cyclophane derivative bearing an alkyne moiety, to overcome all these limitations. In particular, photochemical radical bromination is adopted to obtain a sensitive intermediate. We demonstrated that the synthesized host molecule can be functionalized via click reactions and take part in radical-radical interactions. Our work makes a key functionalized paraquat macrocycle more accessible, facilitating the development of novel redox-responsive systems.
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Dates and versions

hal-04570227 , version 1 (06-05-2024)

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Ahmad Bachir, Fabiana Ciocchetti, Daniel P. Couto, Simone Di Noja, Cristian Pezzato, et al.. Photochemical Bromination of 2,5‐Dimethylbenzoic Acid as Key Step of an Improved Alkyne‐Functionalized Blue Box Synthesis. European Journal of Organic Chemistry, 2023, 26 (29), pp.e202300498. ⟨10.1002/ejoc.202300498⟩. ⟨hal-04570227⟩
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