The photoredox/PPh-mediated cyclization of 2-isocyanobiaryls has been developed. A substantial range of functional-group-rich phenanthridine derivatives were synthesized at room temperature in a highly selective and atom-economic manner. Mechanistic studies suggested that the cyclization process is probably mediated both by PhP radical cation with key 1,2-hydride transfer and hydrogen atom generated through O-H bond homolytic cleavage of PhP-OH radical intermediate.
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