Abstract
AbstractA visible‐light‐mediated cycloaddition of azobenzenes and nonstabilized azomethine ylides has been developed to access 1,2,4‐triazolidines. With readily available organic dye rose bengal as a photocatalyst and alkyl tertiary amines as precursors for azomethine ylides, the reaction proceeded smoothly under visible light irradiation at room temperature, affording various 4‐alkyl‐1,2‐diaryl‐1,2,4‐triazolidines with yields of up to 96%. Preliminarily mechanistic studies suggest that the nonstabilized azomethine ylides are formed in situ through photoredox catalysis.
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