Al-Zoubi RM, Al-Jammal WK, Ferguson MJ, Murphy GK. Domino C-C/C-O bond formation: palladium-catalyzed regioselective synthesis of 7-iodobenzo[
b]furans using 1,2,3-triiodobenzenes and benzylketones.
RSC Adv 2021;
11:30069-30077. [PMID:
35493993 PMCID:
PMC9040925 DOI:
10.1039/d1ra05730h]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 08/31/2021] [Indexed: 11/21/2022] Open
Abstract
A facile and efficient synthesis of 7-iodobenzo[b]furan derivatives via a highly regioselective tandem α-arylation/intramolecular O-arylation of 5-substituted-1,2,3-triiodobenzenes and benzylketones is described. Remarkably, the α-arylation coupling reactions initiate exclusively at the least sterically-hindered position of the triiodoarene, which results in a highly chemoselective transformation. The highest yields were observed in reactions between electron-poor 1,2,3-triiodoarenes and electron-rich benzylketones, yet the optimized reaction conditions were found to be tolerant to a wide range of different functional groups. This unprecedent synthesis of 7-iodobenzo[b]furans from 1,2,3-triiodobenzenes is scalable, general in scope, and provides easy access to valuable precursors for other chemical transformations.
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