In summary, we have developed a facile and efficient route to
3-ylidenephthalides through a rhodium-catalyzed oxidative
coupling/annulation of benzoic acids with terminal alkynes.
This protocol features relatively broad substrate scope, mild
conditions, operational simplicity, good regioselectivity, and
excellent Z selectivity. Considering the wide applications of 3-
ylidenephthalides in pharmaceuticals, our strategy would
provide a great opportunity for rapid construction and
evaluation of diverse 3-ylidenephthalides of potential pharmacological
interest. Further investigation of the reaction
mechanism is ongoing in our laboratory.