Stereoselective formal alkenylation of β,β-disubstituted enesulfinamides for constructing 1,5- and 1,4-dicarbonyl derivatives bearing less-accessible acyclic α-quaternary stereocenters

One-pot conjugate addition–elimination cascade to afford α-alkenylated 1,5- and 1,4-dicarbonyl derivatives bearing less-accessible acyclic quaternary α-stereocenters with high stereocontrol.