<p>Sulfonimidoyl fluorides serve as versatile click linkers and have demonstrated significant utility in the construction of S-stereogenic centers for drug discovery and organic synthesis. Although several established methods enable stereoselective access to these aza−sulfur compounds, achieving direct enantiocontrol in the formation of S(VI)–F bonds remains challenging. Herein, we present a highly efficient strategy to synthesize sulfonimidoyl fluorides through the dynamic kinetic asymmetric fluorination at mild reaction conditions. This one-pot process, involving sequential direct fluorination, hydrolysis and asymmetric fluorination, delivers a wide range of enantioenriched S(VI) compounds with high enantioselectivities. This protocol establishes an ideal platform for concise synthesis of structurally diverse array of S−chirogenic motifs via stereospecific transformations. Mechanistic studies suggest that the steric hindrance and hydrogen-bonding between substrate and phosphate anion are responsible for enantiocontrol.</p>

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Counteranion-mediated dynamic kinetic asymmetric fluorination to access sulfur-stereogenic center

  • Zhihuang Chen,
  • Wen-Yan Tong,
  • Jiye Shu,
  • Junliang Zhang,
  • Xiaodong Xiong

摘要

Sulfonimidoyl fluorides serve as versatile click linkers and have demonstrated significant utility in the construction of S-stereogenic centers for drug discovery and organic synthesis. Although several established methods enable stereoselective access to these aza−sulfur compounds, achieving direct enantiocontrol in the formation of S(VI)–F bonds remains challenging. Herein, we present a highly efficient strategy to synthesize sulfonimidoyl fluorides through the dynamic kinetic asymmetric fluorination at mild reaction conditions. This one-pot process, involving sequential direct fluorination, hydrolysis and asymmetric fluorination, delivers a wide range of enantioenriched S(VI) compounds with high enantioselectivities. This protocol establishes an ideal platform for concise synthesis of structurally diverse array of S−chirogenic motifs via stereospecific transformations. Mechanistic studies suggest that the steric hindrance and hydrogen-bonding between substrate and phosphate anion are responsible for enantiocontrol.