Iodine-catalyzed efficient synthesis of xanthene/thioxanthene-indole derivatives under mild conditions. 2020

Weihang Miao, and Pingting Ye, and Mengjiao Bai, and Zhixin Yang, and Suyue Duan, and Hengpan Duan, and Xuequan Wang
Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province, School of Science, Honghe University Mengzi Yunnan 661100 China huolixuanfeng@126.com.

An iodine-catalyzed nucleophilic substitution reaction of xanthen-9-ol and thioxanthen-9-ol with indoles has been developed, providing an efficient procedure for the synthesis of xanthene/thioxanthene-indole derivatives with good to excellent yields. This protocol offers several advantages, such as short reaction times, green solvent, operational simplicity, easily available catalyst and mild reaction conditions. Moreover, this method showed good tolerance of functional groups and a wide range of substrates.

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