Pd-Catalyzed Borylsilylative Cyclization of 1,6-Allenynes.

A Pd-catalyzed borylsilylative cyclization of 1,6-allenynes with PhMe 2 SiBpin was developed. This method provides a practical and general method to afford the carbocycles and heterocycles bearing silyl and boryl groups with excellent regioselectivities and stereoselectivities in high to excellent yields.