Intramolecular [4 + 2] Cycloaddition Reactions of Ketenimines: A New Synthesis of Benz[<i>b</i>]acridines
作者:Mateo Alajarín、Angel Vidal、María-Mar Ortín、Fulgencio Tovar
DOI:10.1055/s-2002-35234
日期:——
N-[2-(2-Propenyl)phenyl]-C.C-diphenyl ketenimines undergo a thermally induced intramolecular [4 + 2] cycloaddition to give 5,11,11a,12-tetrahydrobenz[b]acridines, which are converted into the fully aromatic benz[b]acridines by oxidation with Pd/C in refluxing ortho-xylene.