A metal-free, visible-light (blue LED: hν = 425 ± 15 nm) photoredox-catalyzed intramolecular cyclization reaction of N-biarylglycine esters to phenanthridine-6-carboxylates in water under an open air atmosphere at ambient conditions has been developed.
An atom-economical and environmentally benign synthesis of N-substituted carbazoles is described. This methodology afforded products in 90–120 minutes.
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