An efficient copper-catalyzed system for C-S cross-coupling of
aromatic thiols with aryl bromides and chlorides has been developed
using 1,2,3,4-tetrahydroquinoline-8-ol as a ligand. It is noteworthy
that this method is proved to be especially effective for aryl bromides
with electron-donating groups. By this protocol, a variety of thioethers
as well as symmetrical and unsymmetrical bis-thioethers are obtained
in excellent yields with an exceptional level of functional group
tolerance and high chemoselectivity.
copper catalyst - aryl bromides - aryl chlorides - cross-coupling - organic sulfides