Novel (E)-5-styryl-2,2′-bithiophene derivatives as ligands for β-amyloid plaques
作者:Mengchao Cui、Zijing Li、Ruikun Tang、Hongmei Jia、Boli Liu
DOI:10.1016/j.ejmech.2011.04.015
日期:2011.7
In continuation of our investigation on the bithiophene structure as potential beta-amyloid probes, a series of (E)-5-styryl-2,2'-bithiophene (SBTP) derivatives was designed and synthesized. In vitro binding showed that all of them displayed high binding affinities to A beta(1-42) aggregates (K(i) = 0.10-41.05 nM). Moreover, two radio-iodinated probes, [(125)I]-(E)-5-(4-iodostyryl)-2,2'-bithiophene ([(125)I]8) and [(125)I]-(E)-5-iodo-5'-(4-methoxystyryl)-2,2'-bithiophene ([(125)I]31) were prepared. Both of them displayed specific labeling of A beta plaques in the brain sections of AD model mice with low background. In vivo biodistribution in normal mice indicated that [(125)I]8 exhibited high initial brain uptake (2.11% ID/g at 2 min) and rapid clearance (0.41% ID/g at 30 min). These preliminary results suggest that SBTP derivatives may be served as novel beta-amyloid imaging probes. (C) 2011 Elsevier Masson SAS. All rights reserved.
Push–pull chromophores based on 2,2′-bi(3,4-ethylenedioxythiophene) (BEDOT) π-conjugating spacer
Replacement of 2,2'-bithiophene by BEDOT in push-pull NLO-phores produces a red shift of the absorption maximum accompanied with a large increase of the quadratic nonlinear optical susceptibility. (C) 2001 Elsevier Science Ltd. All rights reserved.
Design and Synthesis of Push−Pull Chromophores for Second-Order Nonlinear Optics Derived from Rigidified Thiophene-Based π-Conjugating Spacers
Two series of push-pullchromophores built around thiophene-based pi-conjugating spacersrigidified either by covalent bonds or by noncovalent intramolecular interactions have been synthesized and characterized by UV-vis spectroscopy, electric field induced second harmonic generation (EFISH) and differential scanning calorimetry. Comparison of the linear and second-ordernonlinear optical properties