of the MRBTs, 3aa, exhibited a turnover number (TON) as high as 55 000 and dramatic accelerating effects (kobs = 1.95 M–1 s–1) and ranked among the most efficient ligands for copper-catalyzedalkyne and azide cycloaddition. Unlike the difficult access to other known medium rings, these 7–12-membered MRBTs can be prepared in straightforward, one-step manner from structurally diverse linear terminal diynes
得益于其独特的性能,结构新颖且易于使用的中环的开发在制药业和学术研究中引起了极大的兴趣。然而,由于其刚性的骨架和大角度的应变,很难接近中环支架。在本文中,设计,合成了一种新型的带有双氮唑基(MRBT)的中环,被鉴定为铜(I)催化的点击反应的一种有希望的新骨架配体,并用于蛋白质的位点修饰。一种MRBT,3aa,具有高达55,000的周转率(TON),并具有显着的加速作用(k obs = 1.95 M –1 s –1),并且在铜催化的炔烃和叠氮化物环加成反应中位居最有效的配体之列。与难以接近其他已知的中环不同,这些7-12元MRBT可以用结构简单的线性末端二炔和叠氮化物以直接,一步一步的方式制备。因此,独特的可访问性和引人入胜的特性暗示了它们广阔的应用前景。
Synthesis of (+)-Schisanwilsonene A by Tandem Gold-Catalyzed Cyclization/1,5-Migration/Cyclopropanation
作者:Morgane Gaydou、Ricarda E. Miller、Nicolas Delpont、Julien Ceccon、Antonio M. Echavarren
DOI:10.1002/anie.201302411
日期:2013.6.17
Going (anti)viral: The first total synthesis of the antiviral (+)‐schisanwilsonene A has been completed using a fully stereoselective tandem cyclization/1,5‐migration/intermolecular cyclopropanation. The key reaction sequence is catalyzed by gold.