of racemic β-halo-α-keto esters through carbonyl-enereaction were realized using a chiral N,N′-dioxide-nickel(II) complex, giving the corresponding β-halo-α-hydroxy esters containing two vicinal chiral tri- and tetrasubstituted carbon centers in good yields and dr with excellent ee values without the use of extra bases. Meanwhile, a proposed reactionmechanism was presented according to the configuration
An enantioselective three-component reaction of α-diazo ketones with alkenes and 1,3,5-triazines is reported, which leads to poly-functionalized chiral ketones with excellent enantioselectivity. This unprecedented metal carbene gem-dialkylation reaction features a cascade formal asymmetric allylation and aminomethylation process with concomitant construction of all-carbon quaternary stereocenters using