Macrocycle Synthesis by Olefin Metathesis on a Nanosized, Shape-Persistent Tricationic Platinum Template
作者:Aleksey V. Chuchuryukin、Harm P. Dijkstra、Bart M. J. M. Suijkerbuijk、Robertus J. M. Klein Gebbink、Gerard P. M. van Klink、Allison M. Mills、Anthony L. Spek、Gerard van Koten
DOI:10.1002/anie.200390086
日期:2003.1.13
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作者:A. V. Chuchuryukin、H. P. Dijkstra、B. M. J. M. Suijkerbuijk、R. J. M. Klein Gebbink、G. P. M. van Klink、A. M. Mills、A. L. Spek、G. van Koten
DOI:10.1023/a:1025506217829
日期:——
Mono- and tris-3,5- and 2,6-pyridinediyl-containing macroheterocycles were synthesized by metathesis of olefin-substituted pyridines in the coordination sphere of mono- and tris-platinum complexes, respectively. Tris(2,6-pyridinediyl)-containing macroheterocycles were hydrogenated over palladium catalyst. The hydrogenated macrocycle was used as ligand for the triplatinum template. The structure of the resulting complex was established by X-ray analysis.
General Approach for Template-Directed Synthesis of Macroheterocycles by Ring-Closing Metathesis (RCM)
first-generation [Cl2(Cy3P)2RuCHPh] or second-generation [Cl2(Cy3P)(IMes)RuCHPh] Grubbs' catalysts. Reactions of the platinated pincer pyridines with Schrock Mo-based metathesis catalysts results in exclusive olefin isomerization and no productive metathesis. The generated macrocycles (hosts) could effectively be separated from the template by addition of aqueous sodium chloride and reattached to the (recycled)