Background: Chemists have been interested in light as an energy source to induce chemical reactions
since the beginning of scientific chemistry. The organic photochemical reactions do not require toxic or
polluting reagents so these reactions presented perspectives in the context of green chemistry and sustainable
Objective: The largest classical divisions of organic chemistry are constituted by heterocycles. The role of heterocyclic
compounds in a number of areas cannot be ignored. That's why the chemists are continuously trying
to design and synthesize heterocycles. This review summarizes the chemistry of photochemical reactions with
emphasis on their synthetic applications. In this review, the most important photochemical transformations that
have been employed in six-membered N-heterocycles synthesis are presented.
Conclusion: This review discussed the research activities in organic photochemistry that are applicable in organic
synthesis. This review outlined the synthesis of heterocyclic compounds. Traditional approaches require
highly specialized or expensive equipment, are highly inconvenient, or would be of limited use to the synthetic
organic chemist. Therefore, these have been omitted by them. Photochemistry can be used to prepare a number
of heterocycles selectively, efficiently and in high yield.