Abstract
The treatment of N‐aryl biphenylcarboxamide, 1‐chloroanthraquinone (1‐Cl‐AQN) catalyst, and K2CO3 in CHCl3 under visible light irradiation affords phenanthridinone via radical cyclization. This reaction proceeds under transition‐metal‐free condition, room temperature, and direct C–H amidation. Mechanistic studies indicate that amidyl radical generation proceeds by visible light induced proton coupled electron transfer (PCET) from N–H bond of the amide.
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