Molecular devices capable of accessing different controlled conformational states, while optically signaling the occupied state, are attractive tools for nanotechnology since they relate to both areas of molecular mechanical devices and logicgates. We report here a simple molecular system that allows access to four distinct conformational and opticalstates. It is based on the regioselective complexation
Compositions and methods for treating cancer and other diseases characterized by abnormal cell proliferation
申请人:Lehn Jean-Marie
公开号:US20080119492A1
公开(公告)日:2008-05-22
The present invention relates to compositions and methods for treating cancer and other disease states characterized by abnormal cell proliferation. In particular, the present invention relates to certain novel non-nucleoside pharmacologically active compounds that alter telomere and telomerase functions, regulate cell proliferation and/or treat cancer and other diseases characterized by abnormal cell proliferation. The present invention also pertains to pharmaceutical compositions comprising such compounds, and the use of such compounds and compositions, both in vitro and in vivo, to inhibit telomerase, to regulate cell proliferation, and to treat cancer or to inhibit the proliferation of the rumor cells, and to treat other proliferative conditions.
and wide scope in aromatic and heteroaromatic chemistry are presented. Exchange of sulfur components surrounding arenes and heteroarenes may occur at 25 °C, in a process that one may call a “sulfur dance”. A dynamic covalent system involving four components illustrates the thermodynamically-driven formation of a thiacalix[2]arene[2]pyrimidine. This work stimulates the implementation of reversible SNAr
鉴于一类可逆亲核芳香族取代反应在芳香族和杂芳族化学中的重要性和广泛范围,提出了它们的特征。芳烃和杂芳烃周围的硫成分交换可能在 25 °C 时发生,这一过程可以称为“硫舞”。涉及四个组分的动态共价系统说明了噻卡利克斯[2]芳烃[2]嘧啶的热力学驱动形成。这项工作刺激了可逆 SNAr 反应在有机、材料和共价动态化学中的实施。
Dynamic Devices. Shape Switching and Substrate Binding in Ion-Controlled Nanomechanical Molecular Tweezers
作者:Anne Petitjean、Richard G. Khoury、Nathalie Kyritsakas、Jean-Marie Lehn
DOI:10.1021/ja031915r
日期:2004.6.1
As examples of supramolecular devices performing chemical (ionic, molecular) control of binding events and models of related natural systems, two molecular conformational switches are described, which display cation-controlled nanomechanical motion coupled to substrate binding and release. The substrate binding relies on donor/acceptor interactions, provided by intercalation between planar sites located at the extremities of the switching units, whereas cation complexation is responsible for conformational regulation. The terpyridine py-py-py-based receptor is activated toward substrate binding upon complexation of a zinc(II) cation and operates in a two-state process. The replacement of the central pyridine by a 4,6-disubstituted pyridimine as in py-pym-py induces a state reversal and yields a new receptor which binds a substrate in the absence of cation, and releases it when copper(I) is introduced, following a three-step process. These systems represent effector-triggered supramolecular switching devices leading toward multistate nanomechanical chemical systems. These two systems illustrate the use of simple conformational switches in the binding site and allosteric regulation of substrate affinity.
Naphthyridine-Based Helical Foldamers and Macrocycles: Synthesis, Cation Binding, and Supramolecular Assemblies
作者:Anne Petitjean、Louis A. Cuccia、Marc Schmutz、Jean-Marie Lehn
DOI:10.1021/jo702495u
日期:2008.4.1
cations bind to the one-turn helices and macrocycles to promote fibril formation and aggregation. Also, polyammonium substrates are able to tune the length of the overall helix assemblies and the rigidity of long oligomers. The reported data on one-turn, two-turn helices and macrocycles not only allows one to devise a model for the ion-controlled supramolecularassembly of such systems but also provides evidence