intermolecular addition–intramolecular carbocyclization reaction of dialkynylbenzenes was developed. In this reaction, regioselective addition of an external nucleophile toward the terminal alkyne and subsequent 6-endo-dig cyclization proceeded to give the 1,3-disubstituted naphthalenes in good yields. The direct synthesis of disubstituted chrysenesvia a gold-catalyzed addition and double cyclization cascade
Gold-Catalyzed Formal Cyclisation/Dimerization of Thiophene-Tethered Diynes
作者:Svetlana Tšupova、Max M. Hansmann、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/chem.201700061
日期:2017.4.27
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