Tandem synthesis of functionalized tetrahydro-4aH-benzo[c]isoquino[1,2-t]pyrrolo[1,2-a][1,6]naphthyridines

An effective route to fused hexacyclic derivatives of isoquinoline is described via tandem reaction of isoquinoline, dialkyl acetylenedicarboxylates, and 3-chloropentane-2,4-dione or alkyl 3-chloroacetoacetates.