Transition metal‐catalyzed [2+2+2] cyclotrimerization is a powerful method to synthesize substituted benzene derivatives with optimal atom efficiency. However, controlling regio‐ and chemoselectivity is difficult. We present a cobalt catalyzed cycloaddition of alkynes, which provides the cycloaddition products in high yields and excellent regioselectivity in the presence of a pyridine‐2,6‐diimine ligand
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