Copper-catalyzed ligand free ring-opening amination of gem-fluorohalocyclopropanes – An efficient route toward 2-fluoroallylamines
作者:Maxim A. Novikov、Yaroslav A. Ibatov、Nikolai V. Volchkov、Maria B. Lipkind、Sergei E. Semenov、Oleg M. Nefedov
DOI:10.1016/j.jfluchem.2017.01.001
日期:2017.2
Ring-opening amination of gem-chlorofluoro- and gem-bromofluorocyclopropanes with secondary alkyl, aryl amines or hydroxylamines catalyzed by copper(I) or copper(II) compounds with no additional ligands affords tertiary 2-fluoroallylamines or hydroxylamines in moderate to excellent yields. The reaction pathway involves isomerization of gem-fluorohalocyclopropanes to 2-fluoroallyl halides followed by
的开环胺化宝石-chlorofluoro-和宝石与仲烷基,芳基胺或羟胺通过铜催化(I)或铜(II)与没有另外的配体,得到叔2- fluoroallylamines或羟胺在中度至良好的产率的化合物-bromofluorocyclopropanes。该反应途径涉及宝石-氟卤代环丙烷异构化成2-氟烯丙基卤化物,然后用N-亲核试剂原位亲核取代卤化物。该p-甲氧基苯基(PMP)保护基可通过这种方法有效地制备仲2-氟烯丙基胺。伯2-氟烯丙胺只能通过逐步操作来获得,包括CuX催化的宝石-氟卤代环丙烷异构化为2-氟烯丙基卤化物,然后进行胺化。