Catalytic formal [4 + 2] cycloadditions between unactivated allenes and N-hydroxyaniline catalyzed by AuCl3/CuCl2/O2
AuCl3-catalyzed formal [4 + 2]-cycloadditions between substituted allenes and N-hydroxyanilines are described. This reaction sequence comprises initial isomerizations of allenes to butadienes under N2 and subsequent oxidations of N-h