Mixed N-heterocycles/N-heterocyclic carbene palladium(II) allyl complexes as precatalysts for direct arylation of azoles with aryl bromides
作者:Jin Yang
DOI:10.1016/j.tet.2019.02.031
日期:2019.4
A series of mixed N-heterocycles/N-heterocyclic carbene palladium(II) allyl complexes with general formula [(NHC)Pd(η3-allyl)]2(μ2-N-heterocycles)(BF4)2 were prepared in one pot based on anion metathesis of (NHC)Pd(η3-allyl)Cl complexes and then ligand replacement with N-heterocycles [N-heterocycles = pyrazine (pyz), 4,4′-bipyridine (bpy) and trans-4,4′-bipyridylethylene (bpe)]. The solid-state structures
一系列的混合Ñ -heterocycles / Ñ -杂环卡宾钯(II)与通式烯丙基配合物[(NHC)的Pd(η 3 -烯丙基)] 2(μ 2 - Ñ -heterocycles)(BF 4)2在制备一锅基于(NHC)的Pd(的阴离子置换η 3 -烯丙基)氯复合物和配体,然后替换ñ -heterocycles [ ñ -heterocycles =吡嗪(PYZ),4,4'-联吡啶(BPY)和反式-4,4′-联吡啶乙烯(bpe)]。固态结构显示双核结构,其中两个钯(II)中心通过桥连的N杂环结合在一起。初步研究了所得配合物作为唑类与芳基溴化物直接进行C H键芳基化的前催化剂。