No abstract

A cross‐coupling reaction between secondary propargylic acetates and alkenylboronic acids proceeded to give 1,4‐enynes in good yields without addition of transition metal catalyst and base. This simple protocol was also applicable to arylboronic acids, which gave 3‐arylated alkynes in good yields. The observed induction period suggested that the reaction of propargylic acetates and organoboronic acids was affected by the in‐situ generated AcOH as a catalyst, which was confirmed by a separate experiment.