π-Stacking-Controlled Dearomatic Sulfur-Shifted Ene Reaction of Ketenes and Polycyclic Arylthiiranes: Access to Areno[<i>d</i>]-ε-thiolactones
Yinqiao Wang, Yixiang Chen, Jiaxi Xu
Abstract
Electrophilic ring-expansion of polycyclic arylthiiranes and ketenes generated from alkoxy/aryloxyacetyl chlorides in the presence of triethylamine (TEA) is developed and provides a new strategy for the synthesis of areno[ d ]-ε-thiolactones, areno[ d ]thiepinones, directly without catalysts or additives. This strategy features atom- and step-economic one-pot characteristic via a tandem sequence of in situ ketene generation, π-stacking-controlled dearomatic sulfur-shifted ene, and aromatization. The current reaction is a novel strategy of electrophilic ring expansions of three-membered saturated heterocycles.
Topics & Concepts
ChemistryAromatizationKeteneSulfurTriethylamineElectrophileRing (chemistry)CatalysisStackingAnnulationEne reactionMedicinal chemistryCombinatorial chemistryOrganic chemistrySynthesis and Catalytic ReactionsSulfur-Based Synthesis TechniquesCatalytic C–H Functionalization Methods