KIO3‐Catalyzed Domino C(sp2)−H Bond Sulfenylation and C−N Bond Oxygenation of Enaminones toward the Synthesis of 3‐Sulfenylated Chromones

Abstract With 2‐hydroxyphenyl‐functionalized enaminones and thiophenols as the starting materials, the facile synthesis of 3‐sulfenylated chromones has been realized through a KIO 3 ‐catalyzed domino reaction of C−H sulfenylation and subsequent C−N‐cleavage‐based C−O bond formation. The reaction was performed under transition‐metal‐free conditions in ethyl lactate, a bioavailable ecofriendly medium.