Redox-responsive conformational alteration of aromatic amides bearing N-quinonyl system
摘要:
Redox-induced conformational alteration of N-aryl-N-phenylamides, in which the N-aryl group consists of a hydroquinone-p-quinone system, was examined. The reduced form bearing a dihydroxyphenyl or dimethoxyphenyl group exists mainly in the E-form, whereas the oxidized form bearing a N-benzoquinone moiety takes the Z-form both in the crystal and in solution. This redox-induced conformational alteration is associated with a marked change in optical properties. This system appears to have suitable properties for use in external redox stimulus-responsive functional switching. (c) 2012 Elsevier Ltd. All rights reserved.
Alkali Metal Cation−π Interactions Observed by Using a Lariat Ether Model System
作者:Eric S. Meadows、Stephen L. De Wall、Leonard J. Barbour、George W. Gokel
DOI:10.1021/ja003059e
日期:2001.4.1
and 2-(1-naphthyl)ethyl (13). Solid-state structures are reported for six examples of alkalimetal complexes in which the cation is pi-coordinated by phenyl, phenol, or indole. Indole-containing crown, 7, adopts a similar conformation when bound by NaI, KI, KSCN, or KPF(6). In each case, the macroring and both arenes coordinate the cation; the counteranion is excluded from the solvation sphere. NMR measurements
Steroidsulfatase (STS) is responsible for the hydrolysis of biologically inactive sulfated steroids into their active un-sulfated forms and promote the growth of various hormone-dependent cancers (e.g., breast cancer). Therefore, the STS enzyme is a promising therapeutic target for the treatment of steroid-sensitive cancers. Herein, we report the synthesis and biological evaluation of sulfamate analogs
Synthesis and biological evaluation of fluorinated N -benzoyl and N -phenylacetoyl derivatives of 3-(4-aminophenyl)-coumarin-7- O -sulfamate as steroid sulfatase inhibitors
In the present work, we report convenient methods for the synthesis of 3-(4-aminophenyl)-coumarin-7-O-sulfamate derivatives N-acylated with fluorinated analogues of benzoic or phenylacetic acid as steroid sulfatase (STS) inhibitors. The design of these potential STS inhibitors was supported by molecular modeling techniques. Additionally, computational docking methods were used to determine the binding
Phosphonic Acid Analogs of Fluorophenylalanines as Inhibitors of Human and Porcine Aminopeptidases N: Validation of the Importance of the Substitution of the Aromatic Ring
A library of phosphonic acid analogs of phenylalanine substituted with fluorine, chlorine and trifluoromethyl moieties on the aromaticring was synthesized and evaluated for inhibitory activity against human (hAPN) and porcine (pAPN) aminopeptidases. Fluorogenic screening indicated that these analogs are micromolar or submicromolar inhibitors, both enzymes being more active against hAPN. In order to
lanthanide chelate, an antenna, and a luminescence off/on switch. The antenna is an aromatic ring which absorbs light and transmits its energy to the metal, and the switch is a benzene derivative with a different HOMO level. If the HOMO level is higher than a certain threshold, the complex emits no luminescence at all, which indicates that the lanthanide luminescence can be modulated by photoinduced electron
发光镧系元素配合物(Tb3+、Eu3+ 等)具有出色的生物学应用特性,包括极长的寿命和大的斯托克斯位移。然而,由于难以设计具有发光开/关开关的合适配合物,因此很少有关于基于镧系元素的功能探针的报道。在这里,我们合成了一系列由三个部分组成的复合物:镧系元素螯合物、天线和发光开关。天线是一个吸收光并将其能量传递给金属的芳环,开关是一个不同HOMO能级的苯衍生物。如果 HOMO 能级高于某个阈值,则复合物根本不发光,这表明镧系元素发光可以通过从开关到敏化剂的光诱导电子转移(PeT)进行调制。这种控制镧系元素发光的方法使功能性镧系元素配合物的合理设计成为可能,其中...