Two Axles Threaded Using a Single Template Site: Active Metal Template Macrobicyclic [3]Rotaxanes
作者:Stephen M. Goldup、David A. Leigh、Paul R. McGonigal、Vicki E. Ronaldson、Alexandra M. Z. Slawin
DOI:10.1021/ja9080716
日期:2010.1.13
to rotaxanes normally require at least n - 1 template sites to interlock n components. Here we describe the one-pot synthesis of [3]rotaxanes in which a single metal template site induces formation of axles through each cavity of a bicyclic macrocycle. Central to the approach is that a portion of the bicyclic molecule acts as a ligand for a transition metal ion that mediates covalent bond formation
Diels−Alder Active-Template Synthesis of Rotaxanes and Metal-Ion-Switchable Molecular Shuttles
作者:James D. Crowley、Kevin D. Hänni、David A. Leigh、Alexandra M. Z. Slawin
DOI:10.1021/ja101029u
日期:2010.4.14
cavity. Lewis acid activation of the double bond causes it to react with an incoming "stoppered" diene, affording the [2]rotaxane in up to 91% yield. Unusually for an active-template synthesis, the metal binding site "lives on" in these rotaxanes. This was exploited in the synthesis of a molecular shuttle containing two different ligating sites in which the position of the macrocycle could be switched
Improved dynamics and positional bias with a second generation palladium(ii)-complexed molecular shuttle
作者:David A. Leigh、Paul J. Lusby、Roy T. McBurney、Mark D. Symes
DOI:10.1039/c001697g
日期:——
A second generation palladium(II)-complexed molecular shuttle, featuring structural changes to the size and shape of the macrocycle, shows significantly increased rates of shuttling and improved co-conformational bias compared to the original system.
An Unusual Nickel−Copper-Mediated Alkyne Homocoupling Reaction for the Active-Template Synthesis of [2]Rotaxanes
作者:James D. Crowley、Stephen M. Goldup、Nicholas D. Gowans、David A. Leigh、Vicki E. Ronaldson、Alexandra M. Z. Slawin
DOI:10.1021/ja101121j
日期:2010.5.5
Ni-/Cu-mediated alkyne homocoupling reaction, directed through the cavity of a bidentate macrocyclic ligand by chelated metal ions to furnish [2]rotaxanes in excellent (up to 95%) yields. This is the first activemetaltemplate reaction to employ an octahedral coordination geometry metal ion, Ni(II), and the study provides some interesting mechanistic insights into the mixed bimetallic reaction mechanism
Synthesis of a C1-symmetric Box macrocycle and studies towards active-template synthesis of mechanically planar chiral rotaxanes
作者:Pauline E. Glen、James A.T. O'Neill、Ai-Lan Lee
DOI:10.1016/j.tet.2012.10.069
日期:2013.1
A C-1-symmetric Box macrocycle has been synthesized for the first time. The Box macrocycle along with other C-1 and C-2-symmetric Box ligands were evaluated and compared as ligands in the Cadiot-Chodkiewicz, oxidative Heck and CuAAC 'click' reactions as part of our studies towards achieving active-metal template synthesis of mechanically planar chiral rotaxanes. This study constitutes the first report of Cadiot-Chodkiewicz and CuAAC 'click' reactions using Box ligands, as well as the first dedicated study of oxidative Heck reactions using Box ligands. (C) 2012 Elsevier Ltd. All rights reserved.