The electron-deficient azaarenes organic compounds are a ubiquitous theme in natural products with interesting biological properties and widely used in drug discovery. The functionalization of azaarenes (quinoxaline, pyrazine, quinoline or isoquinoline) types of organic compounds is of considerable interest, affording new procedures to introduce new skeleton of bioactive molecules such as Timapiprant (an anti-asthmatic and anti-inflammatory agent), Papaverine (a smooth muscle relaxant), Emetine (an anti-protozoan) and it opens the door to the development of new libraries of bioactive compounds. In this case of the [2+2] photocycloaddition of double bonds to generate cyclobutanes is one of the most employed reactions in photochemical synthesis. In particular, the [2+2] cycloaddition followed by retroaldol condensation reaction was used for the synthesis of 1,5-dicarbonyl compounds.   In this new regards, the [2+2] photocycloaddition followed by a ring-opening rearomatization rea...