Visible‐Light‐Mediated Synthesis of 1‐Oxa‐4‐aza‐spiro Oxazolines by Spiroannulation of Quinones with Vinyl Azides

Abstract A simple and efficient method has been developed to synthesize 1‐oxa‐4‐aza‐spirooxazolines. The reaction was carried out at room temperature using rose bengal as an organic photoredox catalyst and blue LED as a light source. It was observed that quinones underwent spiroannulation reaction with vinyl azide on C−O double bond instead of C−C double bond through which various corresponding 1‐oxa‐4‐aza‐spirooxazolines have been synthesized in good to excellent yields.