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Iron-Catalyzed ortho-Selective C-H Borylation of 2-Phenylpyridines and Their Analogs. | LitMetric

Iron-Catalyzed ortho-Selective C-H Borylation of 2-Phenylpyridines and Their Analogs.

Org Lett

Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasugakoen, Kasuga-shi, Fukuoka 816-8580, Japan.

Published: July 2017

AI Article Synopsis

  • Treatment of 2-phenylpyridines with a 9-BBN dimer and iron salt catalyst leads to the formation of ortho-borylated products, achieving moderate to excellent yields.
  • The reaction can be scaled to gram quantities and is effective on heteroaromatic compounds, demonstrating good functional group compatibility.
  • This C-H borylation method is significantly cheaper than previous palladium-catalyzed approaches, and the resulting products show unique fluorescence properties due to their intramolecular B-N interactions and electron push-pull structures.

Article Abstract

Treatment of 2-phenylpyridines (or their analogs) with a 9-bicycloboranonane dimer (9-BBN dimer) in the presence of a catalytic amount of a commercially available iron salt, FeBr, gave ortho-borylated products in moderate to excellent yields with good functional group tolerance. The reaction proceeded in good yield, even in gram-scale, and also occurred at the C-H bond of heteroaromatic compounds. The cost of the C-H borylation is dramatically lower than that of a previously reported similar palladium-catalyzed reaction. The products exhibit an intramolecular B-N Lewis acid-base interaction and fluoresce in both solution and solid states due to their electron push-pull structures.

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Source
http://dx.doi.org/10.1021/acs.orglett.7b01423DOI Listing

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