Zhang XL, Wang MY, Liu HJ, Wang YQ. Palladium-Catalyzed Regioselective C4-H Acyloxylation of Indoles with Carboxylic Acids via a Transient Directing Groups Strategy.
Org Lett 2024;
26:41-45. [PMID:
38149590 DOI:
10.1021/acs.orglett.3c03568]
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Abstract
The development of an efficient method for the synthesis of C4 oxy-substituted indoles is an appealing yet challenging task. Herein, we report a general palladium-catalyzed TDG approach for the direct C4-H acyloxylation of indoles. The protocol features atom and step economy, excellent regioselectivity, and good tolerance of functional groups. Moreover, the reaction can accommodate a range of carboxylic acids including benzoic acids, phenylacetic acids, and aliphatic acids.
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