作者:Hui Liu、Davide Audisio、Lucie Plougastel、Elodie Decuypere、David‐Alexandre Buisson、Oleksandr Koniev、Sergii Kolodych、Alain Wagner、Mourad Elhabiri、Anna Krzyczmonik、Sarita Forsback、Olof Solin、Véronique Gouverneur、Frédéric Taran
DOI:10.1002/anie.201606495
日期:2016.9.19
reactivity towards both copper‐catalyzed and strain‐promoted cycloaddition reactions with alkynes. Synthetic access to these new mesoionic compounds was granted by electrophilic fluorination of σ‐sydnone PdII precursors in the presence of Selectfluor. Their reactions with terminal and cyclic alkynes were found to proceed very rapidly and selectively, affording 5‐fluoro‐1,4‐pyrazoles with bimolecular
我们报告了4-氟丁酮的合成和反应性,这是一类独特的中离子偶极子,对炔烃的铜催化和应变促进的环加成反应均显示出出色的反应性。在Selectfluor的存在下,通过σ-sydnonePd II前体的亲电氟化反应,可以合成这些新的中离子化合物。发现它们与末端和环状炔烃的反应非常迅速且选择性地进行,从而提供双分子速率常数高达10 4 m -1 s -1的5-氟-1,4-吡唑,超过了文献中有关环炔烃的文献记载。进行了动力学研究以阐明反应的机理,并成功地用[ 18 F] Selectfluor进行了放射性标记,进一步突出了4-氟丁酮的价值。