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4278352 
Journal Article 
Gold superacid-catalyzed preparation of benzo[c]thiophenes 
Debrouwer, W; Seigneur, RA; Heugebaert, TS; Stevens, CV 
2015 
Yes 
Chemical Communications
ISSN: 1359-7345
EISSN: 1364-548X 
51 
4 
729-732 
English 
25418863 
A three-step synthesis of benzo[c]thiophenes is presented in which the key transformation is the gold-catalyzed 5-exo-dig migratory cycloisomerization of a diallyl thioacetal. It was shown that a small amount of in situ generated HAuCl4 from AuCl3 is the active catalytic species. A mechanism was proposed.