Copper-mediated construction of benzothieno[3,2-b]benzofurans by intramolecular dehydrogenative C-O coupling reaction was written by Ai, Liankun;Ajibola, Ibrahim Yusuf;Li, Baolin. And the article was included in RSC Advances in 2021.Product Details of 6287-82-7 This article mentions the following:
An efficient method to synthesize benzothieno[3,2-b]benzofurans such as I [R = H, 3-Cl, 3-t-Bu; R1 = H, 7,8-di-F, 8-Me, etc.] via intramol. dehydrogenative C-H/O-H coupling had been developed. Good to excellent yields (64-91%) could be obtained no matter if the substituted group was electron-donating or electron-withdrawing. Notably, three-to-six fused ring thienofuran compounds I could be constructed using this method. A reaction mechanism study showed that 1,1-diphenylethylene could be completely inhibited the reaction. Therefore, it was a radical pathway initiated by single electron transfer between the hydroxyl of the substrate and the copper catalyst. In the experiment, the researchers used many compounds, for example, 2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7Product Details of 6287-82-7).
2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7) belongs to benzothiophene derivatives. Functionalized benzothiophenes are important constructs found in molecules with wide ranging biological activity and in organic materials. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, and sertaconazole, and also BTCP.Product Details of 6287-82-7
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem