A synthetic approach to the hyperevolutin Aacylated phloroglucinol ring system is described. Thus,intramolecular allene−nitrile oxide cycloaddition of 10 wasused to construct the bicyclic framework and vicinal quaternary centers in cycloadduct 20 in the key bond-formingstep. Treatment of 20 with Raney nickel and hydrogen gasproduced primary enamine 21 which contains a nonenolizable β,β-tricarbonyl group in latent form.