Structure–Activity Relationship Study of Heterocyclic Phenylethenyl and Pyridinylethenyl Derivatives as Tau-Imaging Agents That Selectively Detect Neurofibrillary Tangles in Alzheimer’s Disease Brains
摘要:
In order to explore novel tau-imaging agents that can selectively detect neurofibrillary tangles in Alzheimer's disease (AD) brains, we designed and synthesized a series of heterocyclic phenylethenyl and (3-pyridinyl)ethenyl derivatives with or without a dimethyl amino group. In in vitro autoradiography using AD brain sections, all radioiodinated ligands with a dimethyl amino group bound to A beta deposits in the sections. In contrast, the ligands without a dimethyl amino group showed different patterns of radioactivity accumulation in the sections depending on the kind of heterocycle contained in their molecules. Particularly, a phenylethenyl benzimidazole derivative ([I-125]64) showed marked radioactivity accumulation in the temporal lobe which corresponded with the distribution of tau deposits. [I-125]64 also showed the most favorable pharmacokinetics in normal mouse brains (3.69 and 0.06% ID/g at 2 and 60 min postinjection, respectively) among all ligands in this study. Taken together, these results suggest that [I-123]64 may be a new candidate tau-imaging agent.
The invention is directed to compounds of Formula (I):
to pharmaceutical compositions containing such compounds and to methods of treatment using them.
The invention is directed to compounds of Formula (I):
to pharmaceutical compositions containing such compounds and to methods of treatment using them.
该发明涉及公式(I)的化合物,涉及含有这些化合物的制药组合物以及使用它们的治疗方法。
Synthesis and evaluation of in vitro anti-microbial and anti-tubercular activity of 2-styryl benzimidazoles
作者:Ramya V. Shingalapur、Kallappa M. Hosamani、Rangappa S. Keri
DOI:10.1016/j.ejmech.2009.05.021
日期:2009.10
A new series of novel 5-(nitro/bromo)-styryl-2-benzimidazoles (1-12) has been synthesized by simple, mild and efficient synthetic protocol by attempted condensation of 5-(nitro/bromo)-o-phenylenediamine with trans-cinnamic acids in ethylene glycol. Screening for in vitro anti-tubercular activity against Mycobacterium tuberculosis H-37 Rv, anti-bacterial activity against Staphylococcus aureus, Escherichia coli, Enterococcus faecalis, Klebsiella pneumoniae bacterial strains and anti-fungal activity against Candida albicans and Asperigillus fumigatus fungal strains were carried out. Compounds 5, 7, 8, 9, 11 showed higher anti-tubercular activity and compounds 7, 8, 10, 11, 12 have proved to be effective with MIC (mu g/ml) and emerged as lead molecules showing excellent activities against a panel of microorganisms. All synthesized compounds were characterized using IR, H-1, C-13 NMR, GC-MS and elemental analysis. (c) 2009 Elsevier Masson SAS. All rights reserved.