Electrochemical Umpolung of Bromide: Transition-Metal-Free Bromination of Indole C⁻H Bond.
Molecules 2019;
24:molecules24040696. [PMID:
30769954 PMCID:
PMC6412264 DOI:
10.3390/molecules24040696]
[Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 02/07/2019] [Accepted: 02/12/2019] [Indexed: 11/17/2022] Open
Abstract
A facile and sustainable electrochemical umpolung of bromide ion protocol was developed under mild reaction conditions. Transition metal catalysts and exogenous chemical oxidants were obviated for the bromination of C⁻H bond. Notably, graphite rod, which is commercially available at supermarkets and is inexpensive, was employed as the electrode material. This operationally easy and environmentally friendly approach accomplished the synthesis of 3-bromoindole in excellent yield and regioselectivity.
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