In this study, a structured remodeling of designed pyridinium salts was achieved through an interrupted Corey-Chaykovsky reaction, leading to the synthesis of unprecedented multi-ring compounds such as vicinal bis-spirocyclic indanones and spirannulated benzocycloheptanones. By rationally combining nucleophilic sulfur ylides with electrophilic pyridinium salts, a regio- and stereoselective synthesis of new classes of cyclopropanoids was achieved. Plausible mechanistic pathways were proposed based on experimental results and control experiments.
Simultaneous dearomatizing spirannulation of pyridinium salts is still in its infancy. Here, we present an organized skeletal remodeling of designed pyridinium salts by utilizing an interrupted Corey-Chaykovsky reaction to access unprecedented and structurally intriguing molecular architectures such as the vicinal bis-spirocyclic indanones and spirannulated benzocycloheptanones. This hybrid strategy rationally merges the nucleophilic features of sulfur ylides with the electrophilic pyridinium salts to achieve the regio- and stereoselective synthesis of new classes of cyclopropanoids. The plausible mechanistic pathways were derived from experimental results and control experiments.
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