Visible-light-mediated intramolecular [2+2] cycloaddition of aza-1,6-dienes gives bridged, not fused, heterocycles, in violation of the ‘rule-of-five’, which dictates that five-membered rings are preferentially formed. This method allows a variety of bridged bicyclic scaffolds to be accessed, enabling drug-relevant properties to be readily tuned.
- Ze-Xin Zhang
- KaiChen Shu
- Varinder K. Aggarwal