Gold-Catalyzed Formal Cyclisation/Dimerization of Thiophene-Tethered Diynes.
Svetlana TšupovaMax M HansmannMatthias RudolphFrank RomingerA Stephen K HashmiPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2017)
A new pathway in dual gold-catalyzed reaction of thiophene-tethered diynes has been identified. A series of fully conjugated alkynyl-substituted benzothiophenes and benzofurans was obtained by a formal cyclisation/dimerization sequence. All the products are fluorescent, owing to their extended conjugation. The mechanistic studies have been carried out, suggesting that gold acetylides take part in this transformation.