ChemInform Abstract: Gold(I)-Catalyzed Generation of the Two Components of a Formal [4 + 2] Cycloaddition Reaction for the Synthesis of Tetracyclic Pyrano[2,3,4-de]chromenes.
A novel gold-catalyzed cascade reaction of ortho-alkynyl substituted salicylaldehydes with alkynylamines is developed to provide tetracyclic products (III) with excellent diastereoselectivity.