Rotaxane-Based Propeptides: Protection and Enzymatic Release of a Bioactive Pentapeptide
作者:Anthony Fernandes、Aurélien Viterisi、Frédéric Coutrot、Stéphanie Potok、David A. Leigh、Vincent Aucagne、Sébastien Papot
DOI:10.1002/anie.200903215
日期:2009.8.17
Ring of protection: A [2]rotaxane 1 protects and selectively releases a bioactivepentapeptide. The rotaxane macrocycle provides a defensive shield that very significantly improves the poor stability of the peptide to both individual peptidases and the cocktail of enzymes present in human plasma. Glycosidase‐catalyzed cleavage of a carbohydrate ‘stopper’ in the rotaxane triggers release of the parent
Luminescent reporter compounds that are rotaxanes having the structure
where B—Z—C is a reporter molecule based on a cyanine, squaric acid, or other reporter, and K is a macrocycle that encircles and interlocks with the reporter molecule. Applications of the reporter compounds are provided, as well as reactive intermediates used to synthesize the reporter compounds, and methods of synthesizing the reporter compounds.
protection of threaded functions by the macrocycle, in this case promoting an unusual and disfavored 4-exo-trig ringclosure. Kinetic and synthetic studies allowed us to delineate an advantageous approach toward β-lactams based on a two-step, one-pot protocol: an intramolecular ringclosure followed by a thermally induced dethreading step. The advantages of carrying out this cyclization in the confined
Dethreading of Tetraalkylsuccinamide-Based [2]Rotaxanes for Preparing Benzylic Amide Macrocycles
作者:Alberto Martinez-Cuezva、Leticia V. Rodrigues、Cristian Navarro、Fernando Carro-Guillen、Lilian Buriol、Clarissa P. Frizzo、Marcos A. P. Martins、Mateo Alajarin、Jose Berna
DOI:10.1021/acs.joc.5b01651
日期:2015.10.16
formation and its further dethreading, has been exploited for preparing benzylic amide macrocycles enhancing, in most cases, the results of the classical (2 + 2) condensation and other reported stepwise syntheses. The kinetics of the dethreading process is fairly sensitive to the electronic effects of the substituents on the isophthalamide unit or to the electronic nature of the pyridine rings through
本文报道了一系列带有苄基酰胺大环的基于琥珀酰胺的[2]轮烷的脱螺纹。在快速真空热解,常规加热或微波辐照下,这些转化定量进行。研究螺纹末端和大环腔内的塞子的大小互补性,使我们能够建立最佳的取代基,以实现从互锁前体中挤出螺纹。多种1为了评估脱线过程的速率常数,轮烷的半衰期以及温度和溶剂对这些过程的影响,进行了1 H NMR动力学实验。使用二丁基氨基基团作为塞子,可以合理的收率得到轮烷的前体,并允许轮烷的定量脱脂。已经开发了包括轮烷形成及其进一步脱线在内的整个过程,用于制备苄基酰胺大环化合物,在大多数情况下,这些化合物可增强经典(2 + 2)缩合反应和其他报道的逐步合成的结果。
Thermally and Photochemically Induced Dethreading of Fumaramide-Based Kinetically Stable Pseudo[2]rotaxanes
作者:Alberto Martinez-Cuezva、Fatima Morales、Grace R. Marley、Adrian Lopez-Lopez、Juan Carlos Martinez-Costa、Delia Bautista、Mateo Alajarin、Jose Berna
DOI:10.1002/ejoc.201900073
日期:2019.6.10
The thermal‐ and light‐driven dethreading processes of kinetically stable pseudo[2]rotaxanes bearing tetrasubstituted‐fumaramides as threads are described. The influence of the stopper size, the flexibility of the thread and macrocycle and the strength of the intercomponent interactions on the disconnection rate have been thoroughly studied.