Regioselective Synthesis of 1,5-Diaryl-1<i>H</i>-imidazoles by Palladium-Catalyzed Direct Arylation of 1-Aryl-1<i>H</i>-imidazoles
作者:Fabio Bellina、Silvia Cauteruccio、Luisa Mannina、Renzo Rossi、Stéphane Viel
DOI:10.1021/jo050274a
日期:2005.5.1
A variety of 1,5-diaryl-1H-imidazoles have been regioselectively synthesized by direct coupling of 1-aryl-1H-imidazoles with aryl iodides or bromides in DMF in the presence of CsF as the base and a catalyst precursor consisting of a mixture of Pd(OAc)2 and AsPh3. The data obtained in this synthetic study support a reaction mechanism involving an electrophilic attack of an arylpalladium(II) halide species
在CsF作为碱和由以下成分组成的催化剂前体的存在下,通过在DMF中将1-芳基-1 H-咪唑与芳基碘化物或溴化物直接偶联,已选择性地合成了多种1,5-二芳基-1 H-咪唑。 Pd(OAc)2和AsPh 3的混合物。在这项综合研究中获得的数据支持了涉及芳基钯(II)卤化物物种对咪唑环的亲电攻击的反应机理。有趣的是,已经发现在该研究中合成的一些咪唑衍生物对人肿瘤细胞系表现出显着的细胞毒性活性。