Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A variety of 4-arylquinoline-2-thiones and 3-arylthieno[2,3-b]indoles were synthesized in high yields via TfOH-promoted tandem Friedel–Crafts alkenylation–cyclization reactions of 2-alkynylphenyl isothiocyanates. ... A variety of 4-arylquinoline-2-thiones and 3-arylthieno[2,3-b]indoles ...