Access to chiral γ-butenolides via palladium-catalyzed asymmetric allylic C–H alkylation of 1,4-dienes

Asymmetric allylic C–H alkylation of 1,4-pentadienes with α-angelica lactones has been developed by tri-axial phosphoramidite-palladium catalysis. This reaction can tolerate a range of functional groups under mild conditions, furnishing versatile chiral γ,γ-disubstituted butenolides in high yields with good to high levels of stereoselectivity.