An efficient route to unsymmetrical bis(azolium) salts: CCC-NHC pincer ligand complex precursors
作者:Hannah K. Box、Tyler O. Howell、William E. Kennon、Griffin A. Burk、Henry U. Valle、T. Keith Hollis
DOI:10.1016/j.tet.2017.02.020
日期:2017.4
The coupling of N-heterocyclic azoles (imidazoles, benzimidazoles, triazoles) to bromobenzenes (1,2-; 1,3-; or 1,4) in a step-wise, sequential manner was accomplished by manipulation of reaction time and stoichiometry, which provided straight-forward access to unsymmetrical bis(azolium) salts in only three isolation steps from commercially-available starting materials. Eight mono(azole) substituted
N-杂环唑(咪唑,苯并咪唑,三唑)与溴苯(1,2-; 1,3-;或1,4)的逐步,偶合偶联是通过控制反应时间和化学计量来实现的,它仅需三个分离步骤即可从市售原料中直接获得不对称双(偶氮)盐。据报道,八种单(唑)取代的溴苯,四种单(偶氮)溴苯盐,十二种不对称的双(唑)苯和十四种不对称的双(偶氮)盐是钳状配体络合物的前体。