A convenient synthesis of 3,4-diaryl(hetaryl)-substituted maleimides and maleic anhydrides was written by Shorunov, S. V.;Krayushkin, M. M.;Stoyanovich, F. M.;Irie, M.. And the article was included in Russian Journal of Organic Chemistry in 2006.Synthetic Route of C9H7BrS This article mentions the following:
A convenient procedure has been developed for the synthesis of 3,4-diaryl(or hetaryl)maleimides by cross coupling of N-substituted 3,4-dibromomaleimides with aryl(hetaryl)boronic acids in the presence of Pd(Ph3P)4 and CsF. The reaction ensures high yields of the products and requires relatively small amount of the catalyst; it can be performed on an enlarged scale. The resulting maleimides are readily converted into the corresponding maleic anhydrides. In the experiment, the researchers used many compounds, for example, 3-Bromo-2-methylbenzo[b]thiophene (cas: 10243-15-9Synthetic Route of C9H7BrS).
3-Bromo-2-methylbenzo[b]thiophene (cas: 10243-15-9) belongs to benzothiophene derivatives. Benzothiophene finds use in research as a starting material for the synthesis of larger, usually bioactive structures. It is found within the chemical structures of pharmaceutical drugs such as zileuton, raloxifene, and sertaconazole, and also BTCP.Synthetic Route of C9H7BrS
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem