The visible light-promoted [2 + 2] cycloaddition is a useful and extended route to prepare cyclobutanes and their derivatives. Here, we present an aza variant, in which heterocycles and olefins undergo a cycloaddition-ring opening rearomatization sequence, providing access to functionalised nitrogen heterocycles.
- Noelia Salaverri
- Rubén Mas-Ballesté
- José Alemán
