Regioselective halogenation of six-membered -heteroarenes is crucial for precise functional derivatization. We present a -selective halogenation method for pyridines, quinolines, and isoquinolines via electrophilic halogen radical addition utilizing an -benzyl activation strategy. This method achieves C3- and C5-dihalogenation in pyridines, C3- and C6-dihalogenation in quinolines, and C3-monohalogenation in isoquinolines. The feasibility and potential applications of this method were validated through scale-up reactions and the bromination of quinoline derivatives with biomolecular fragments.
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http://dx.doi.org/10.1021/acs.orglett.4c01643 | DOI Listing |
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