Transition metal complexes in organic synthesis, part 36. Cyclization of tricarbonyliron complexes by oxygen to 4a,9a-Dihydro-9H-carbazoles: Application to the synthesis of mukonine, mukonidine, and pyrido[3,2,1-jk]carbazoles

Article abstract of DOI:10.1016/S0040-4039(96)02364-7

Aryl-substituted tricarbonyl(η⁴-cyclohexa-1,3-diene)iron complexes are oxidatively cyclized in protic medium in the air to tricarbonyliron-complexed 4a,9a-dihydro-9H-carbazoles. The method is applied to the total synthesis of mukonine and mukon