Abstract
AbstractA Lewis acid‐catalyzed tricyclization of yne‐allenones with 1‐alkynylnaphthalen‐2‐ols has been developed, and used to produce a wide range of rotationally hindered tribenzo[a,c,j]xanthenes with generally good yields and stereoselectivity. This process involves a complex [2+2] cycloaddition relay and [4+2] cyclization cascade, enabling scission/recombination of C−C triple bonds to access unprecedented hexaheterocyclic architectures. The reaction also features good compatibility with different types of substituents, triple annulation cascade and the efficient control of regio‐ and stereochemistry.magnified image
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