Orthogonal Recognition Processes Drive the Assembly and Replication of a [2]Rotaxane

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• 作者：Tamara Kosikova ; Nurul Izzaty Hassan ; David B. Cordes ; Alexandra M. Z. Slawin ; Douglas Philp
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：December 30, 2015
• 年：2015
• 卷：137
• 期：51
• 页码：16074-16083
• 全文大小：735K
• ISSN：1520-5126

文摘

Within a small, interconnected reaction network, orthogonal recognition processes drive the assembly and replication of a [2]rotaxane. Rotaxane formation is governed by a central, hydrogen-bonding-mediated binding equilibrium between a macrocycle and a linear component, which associate to give a reactive pseudorotaxane. Both the pseudorotaxane and the linear component undergo irreversible, recognition-mediated 1,3-dipolar cycloaddition reactions with a stoppering maleimide group, forming rotaxane and thread, respectively. As a result of these orthogonal recognition-mediated processes, the rotaxane and thread can act as auto-catalytic templates for their own formation and also operate as cross-catalytic templates for each other. However, the interplay between the recognition and reaction processes in this reaction network results in the formation of undesirable pseudorotaxane complexes, causing thread formation to exceed rotaxane formation in the current experimental system. Nevertheless, in the absence of competitive macrocycle-binding sites, realization of a replicating network favoring formation of rotaxane is possible.