Shinde GH, Ghotekar GS, Amombo Noa FM, Öhrström L, Norrby PO, Sundén H. Regioselective
ortho halogenation of
N-aryl amides and ureas
via oxidative halodeboronation: harnessing boron reactivity for efficient C-halogen bond installation.
Chem Sci 2023;
14:13429-13436. [PMID:
38033885 PMCID:
PMC10685333 DOI:
10.1039/d3sc04628a]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 10/23/2023] [Indexed: 12/02/2023] Open
Abstract
The installation of the C-halogen bond at the ortho position of N-aryl amides and ureas represents a tool to prepare motifs that are ubiquitous in biologically active compounds. To construct such prevalent bonds, most methods require the use of precious metals and a multistep process. Here we report a novel protocol for the long-standing challenge of regioselective ortho halogenation of N-aryl amides and ureas using an oxidative halodeboronation. By harnessing the reactivity of boron over nitrogen, we merge carbonyl-directed borylation with consecutive halodeboronation, enabling the precise introduction of the C-X bond at the desired ortho position of N-aryl amides and ureas. This method offers an efficient, practical, and scalable solution for synthesizing halogenated N-heteroarenes under mild conditions, highlighting the superiority of boron reactivity in directing the regioselectivity of the reaction.
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