Tandem cyclization-cycloaddition reaction of rhodium carbenoids. Scope and mechanistic details of the process

Article abstract of DOI:10.1021/ja00164a034

Treatment of 1-diazo-2,5-pentanediones with rhodium(II) carboxylates affords cyclic six-ring carbonyl ylide dipoles. These species undergo facile 1,3-dipolar cycloaddition with both electron-deficient and electron-rich dipolarophiles. In certain cases 2:1