Iodoalkyne‐Based Catalyst‐Mediated Activation of Thioamides through Halogen Bonding |
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| Authors: | Dr. Akinobu Matsuzawa Shiho Takeuchi Prof. Dr. Kazuyuki Sugita |
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| Affiliation: | Department of Synthetic Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Hoshi University, Tokyo, Japan |
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| Abstract: | Halogen bonding catalysis has recently gained increasing attention as a powerful tool to activate organic molecules. However, the variety of the catalyst structure has been quite limited so far. Herein, we report the first example of the use of an iodoalkyne as a halogen bond donor catalyst. By using an iodoalkyne bearing a pentafluorophenyl group as a catalyst, thioamides were efficiently activated and reacted with 2‐aminophenol to generate benzoxazoles in good yield. Mechanistic studies, including 13C NMR spectroscopic analysis and several control experiments, provided concrete evidence that this catalytic activation is based on halogen bonding. Thus, the results obtained in this study demonstrate that iodoalkynes can serve as a new scaffold for future development of halogen bonding catalysis. |
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| Keywords: | halogen bonds heterocycles iodoalkynes organocatalysis thioamides |
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