Preparation of ( E )-1,3-Enyne Derivatives through Palladium Catalyzed Hydroalkynylation of Allenes.

A general and efficient palladium catalyzed hydroalkynylation of allenes was developed to produce synthetically versatile ( E )-1,3-enyne derivatives with high regio- and stereoselectivity. This catalytic system proceeded under mild conditions and was compatible with a broad range of substrates, especially for allenes without electron-bias groups. This work further broadens the synthetic potential of these scaffolds in organic synthesis and medicinal chemistry.