Palladium-catalyzed highly diastereoselective cascade dihalogenation of alkyne-tethered cyclohexadienones via Umpolung of palladium enolate

A highly regio- and diastereoselective Pd(ii)-catalyzed cascade dihalogenation of alkyne-tethered cyclohexadienones proceeding via an electrophilic oxa-π-allyl palladium-species was demonstrated.