期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 364, 期 13, 页码 2197-2204出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.202200331
关键词
Polycycles; Photosynthesis; Cycloaddition; C-C bond formation; Synthetic methods
资金
- National Natural Science Foundation of China [21871094]
- Guangdong Natural Science Foundation [2017A030312005]
- Science and Technology Planning Project of Guangdong Province, China [2017A020216021]
- Guangxi Key Laboratory of Zhuang and Yao Ethnic Medicine [32]
In this work, a visible-light-induced [2+2+1] dearomative cascade cyclization of indole/furan alkynes with NaHSO3 has been reported, delivering various highly strained sulfonyl polycycles. Compared to previous methods, this approach eliminates the need for additional sacrificial oxidants and exhibits a wider reaction scope. Preliminary mechanistic studies suggest that the indole moiety initiates the reaction, which proceeds through a single-electron oxidation pathway.
Herein, we report a visible-light-induced [2+2+1] dearomative cascade cyclization of indole/furan alkynes with NaHSO3, providing an array of diverse highly strained sulfonyl polycycles. Compared to our previous work, this method does not require the use of additional sacrificial oxidants and have wider reaction scope. Preliminary mechanistic studies suggest that the indole moiety initiated the reaction, which proceeded via single-electron oxidation pathway. An alkenyl radical formed by intramolecular addition capture SO2, and the resulting specie is cyclized to furnish the final product. Also, DFT calculations disclosed that the groups on the indole ring or at the side chain probably affect the single electron distribution at the reaction site of IM-RC-I, and the distribution may be a decisive factor of spirocyclization.
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