Keywords
2-f ]phenanthrdine.
4- dione
4-d ]pyrimidine-2
4':3
4]pyrrolo[1
autocatalytic synthesis
CH-arylation
Cyclization
phenanthridine
photocatalyst
pyrimido[5'
Pyrrole
pyrrolo[3
Abstract
An unprecedented transition metal-free visible light-induced autocatalytic intramolecular C-Hal (Hal = Cl, Br, I)/C-H bond activation leading to the formation of a new C-C bond between spatially converged benzene rings has been disclosed. In fact, irradiation of 5,6-diaryl-1H-pyrrolo- [3,4-d ]pyrimidine-2,4-diones with 395 nm LED light at room temperature promotes their cyclization to pyrimido[5′,4′:3,4]- pyrrolo[1,2-f]phenanthridine-12,14(11H,13H)-diones in high yields, with the halogen nature being insignificant.
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