A Facile Route to Symmetrical and Unsymmetrical Cycloalkeno[<i>c</i>]fused 2,2′-Bipyridine Ligands via Inverse Electron Demand Diels-Alder Reaction of 5,5′-bi-1,2,4-Triazines
作者:Danuta Branowska
DOI:10.1055/s-2003-41452
日期:——
A series of 6,6'-bisfunctionalized symmetrical cycloalkeno[c]fused 2,2'-bipyridines 4a-h or unsymmetrical cycloalkeno[c]fused 2,2'-bipyridines 6a-g is described. They were prepared by the Diels-Alder reaction of 3,3'-disubstituted 5,5'-bi-1,2,4-triazines 2a,b with cyclic enamines 3a-d. The regioselective reaction of 1-vinylimidazole (3e) with 2a leads to 5-(2-pyridyl)-1,2,4-triazine 9 which undergoes
描述了一系列 6,6'-双官能化对称环烯基 [c] 稠合 2,2'-联吡啶 4a-h 或不对称环烯基 [c] 稠合 2,2'-联吡啶 6a-g。它们是通过 3,3'-二取代 5,5'-bi-1,2,4-三嗪 2a,b 与环状烯胺 3a-d 的 Diels-Alder 反应制备的。1-乙烯基咪唑 (3e) 与 2a 的区域选择性反应导致 5-(2-吡啶基)-1,2,4-三嗪 9 与环状烯胺 3a-d 发生 Diels-Alder 反应得到不对称的 2,2'-连接有一个环烯烃环的联吡啶 10a-d。