Ring-closing metathesis approach to symmetrical and unsymmetrical cycloakeno[c]fused 2,2′-bipyridine-based cyclophanes
摘要:
Ring-closing metathesis reactions of symmetrical and unsymmetrical cycloalkeno[c]fused 2,2'-bipyridines, substituted at the alpha and alpha' positions of the pyridine rings with sufficiently long alkenyl ethers, afforded 16-membered cyclophanes, possessing variously annulated 2,2'-bipyridine subunits. (c) 2005 Elsevier Ltd. All rights reserved.
A simple and efficient synthesis of annulated 2,2′-bipyridinium salts with attached dihydrothiazole or dihydro-1,3-thiazine rings has been developed through tandem S-transalkylation/intramolecular ring closure of 2,2′-bipyridine alkyl sulfides. The structures were confirmed by X-ray crystallographic analysis.
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 cyclicenamines 3a-d. The regioselective reaction of 1-vinylimidazole (3e) with 2a leads to 5-(2-pyridyl)-1,2,4-triazine 9 which undergoes
Ring-closing metathesis approach to symmetrical and unsymmetrical cycloakeno[c]fused 2,2′-bipyridine-based cyclophanes
作者:D. Branowska、A. Rykowski
DOI:10.1016/j.tet.2005.08.081
日期:2005.11
Ring-closing metathesis reactions of symmetrical and unsymmetrical cycloalkeno[c]fused 2,2'-bipyridines, substituted at the alpha and alpha' positions of the pyridine rings with sufficiently long alkenyl ethers, afforded 16-membered cyclophanes, possessing variously annulated 2,2'-bipyridine subunits. (c) 2005 Elsevier Ltd. All rights reserved.