compounds are gaining increasing interest for life science applications. The replacement of hydrogen in arenes or heteroarenes by a perfluoroalkyl group has a profound influence on the physical and biological properties of such building blocks. Here, an operationally simple protocol for the directCH perfluoroalkylation of (hetero)arenes with RfI or RfBr has been developed, using a robust supported platinum
氟化有机化合物在生命科学应用中越来越受到关注。芳烃或杂芳烃中的氢被全氟烷基取代对这种结构单元的物理和生物学特性产生深远的影响。在此,使用R f I或R f对(杂)芳烃进行直接CH全氟烷基化的操作简单协议使用坚固的负载型铂催化剂已开发出Br。起始原料的可用性,优异的底物耐受性和催化剂的可重复使用性使该方法对合成各种全氟烷基取代的芳族化合物具有吸引力。初步的机理研究表明,自由基的形成对反应系统至关重要。
Palladium-Catalyzed C–H Perfluoroalkylation of Arenes
作者:Rebecca N. Loy、Melanie S. Sanford
DOI:10.1021/ol200628n
日期:2011.5.20
A new Pd-catalyzed reaction for the coupling between perfluoroalkyl Iodides (RFI) and simple aromatic substrates is described. The perfluoroalkylated arene products are obtained In good to excellent yields in the presence of a phosphine-ligated Pd catalyst and Cs2CO3 as a base. The development, optimization, scope, and preliminary mechanistic studies of these transformations are reported.
A general and practical Ni-catalyzed C–H perfluoroalkylation of (hetero)arenes
(hetero)arenes using the air- and moisture-stable complex (dppf)Ni(o-tol)Cl was developed (23 examples). The novel procedure allows for the synthesis of various fluorinated products and tolerates sensitive functional groups including aldehydes, free aminogroups and several heterocycles.