钯
部分
吲哚试验
化学
催化作用
组合化学
色氨酸
立体化学
有机化学
生物化学
氨基酸
作者
Xiaoling Shi,Zemin Wang,Yuxiu Li,Xiaowei Li,Xiangqian Li,Dongxia Shi
标识
DOI:10.1002/anie.202103395
摘要
Abstract Palladium‐catalyzed direct C−H activation of indole benzenoid moiety has been achieved in the past decade. However, palladium‐catalyzed remote C−H activation of indoles is rare. Herein, we report a challenging palladium‐catalyzed remote C4‐H phosphonylation of indoles by a radical approach. The method provides access to a series of C4‐phosphonylated indoles, including tryptophan and tryptophan‐containing dipeptides, which are typically inaccessible by direct C4‐H activation due to its heavy reliance on C3 directing groups. Notably, unexpected C6‐phosphonylated indoles were obtained through blocking of the C4 position. The preliminary mechanistic studies indicated that the reactions may proceed via a C7‐palladacycle/remote‐activation process. Based on the strategy, examples of remote C4‐H difluoromethylation with BrCF 2 COOEt are also presented, suggesting that the strategy may offer a general blueprint for other cross‐couplings.
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