The reaction of thioaurone derivatives
with allenoate catalyzed
by tris(4-methoxyphenyl)phosphane (P(4-MeOC<sub>6</sub>H<sub>4</sub>)<sub>3</sub>) resulted in a domino annulation reaction to produce
a benzothiophene-fused bridged bicyclic ring, with 40–91% yields.
The advantages of the methodology include diastereoselective formation
of a bridged bicyclic ring in a single step, very mild reaction conditions,
and success resulting from a broad functional group. The proposed
mechanism was tested and supported by DFT calculations
