Benzocyclobutenedione and substituted benzocyclobutenediones2 are distinguished by their wide range of possible reactions and have been recently used as synthons as well as for the construction of complex organic molecule^.^ Several high-yield methods are available for their synthesi~.~,~ By contrast, only a small number of annulated benzocyclobutenediones (ABBDs) have been presented in the literaturel~~~,~ and there ...
