Add time:07/22/2019         Source:sciencedirect.com

C-4 Fluorination of a series of 3,5-diarylisoxazoles has been accomplished using the N-F reagent Selectfluor®. With substrates containing neutral or activating substituents on the 5-phenyl ring, acetonitrile at room temperature or at reflux could be used as solvent. However, when deactivating substituents were present, a higher reaction temperature was required for which sulfolane was found to be a good solvent. At this higher temperature, a unique trifluorination of the isoxazole nucleus by an addition mechanism occurred as a side reaction.

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