3 years ago

Electrophilic Cyclization of Phenylalkynediols to Naphthyl(aryl)iodonium Triflates with Chelating Hydroxyls: Preparation and X-ray Analyses

Electrophilic Cyclization of Phenylalkynediols to Naphthyl(aryl)iodonium Triflates with Chelating Hydroxyls: Preparation and X-ray Analyses
Robert J. Hinkle, Seong Ik Cheon, Sarah E. Bredenkamp, Robert D. Pike
Alkynediols containing one propargylic alcohol as well as a second alcohol, which is propargylic or homopropargylic, react with PhI+CNOTf (Stang’s reagent) or 3,5-(CF3)2C6H3I+CNOTf to afford naphthyl(aryl)iodonium triflates. The reaction occurs at room temperature over the course of 6–12 h and provides 36–82% yields of microcrystalline solids. Slow diffusion of Et2O into CH3CN solutions of the salts afforded X-ray quality crystals of five compounds with hydroxyl groups forming five- and six-membered chelation complexes with the iodine atom. Crystallizations from larger scale reactions (≥∼0.25 mmol) were generally facile from CH2Cl2.

Publisher URL: http://dx.doi.org/10.1021/acs.joc.7b01619

DOI: 10.1021/acs.joc.7b01619

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