Dearomative Intramolecular Diels–Alder/Sulfur Extrusion Reaction of Thiophenes with Alkynes Using peri‐Substituted Naphthalene as a Tether.

Dearomative intramolecular Diels–Alder/sulfur extrusion reaction of thiophenes with alkynes successfully afforded fluoranthenes in moderate to excellent yields. The proximity of both reactive sites fixed at the peri‐position of naphthalene would play an important role in the progress of this reaction. Tri(o‐tolyl)phosphine effectively suppressed the side reactions as a sulfur scavenger. [ABSTRACT FROM AUTHOR]