(E)-5-Styryl-1H-indole and (E)-6-Styrylquinoline Derivatives Serve as Probes for β-Amyloid Plaques
作者:Yang Yang、Hong-Mei Jia、Bo-Li Liu
DOI:10.3390/molecules17044252
日期:——
We report the synthesis and biological evaluation of novel (E)-5-styryl-1H-indole and (E)-6-styrylquinoline derivatives as probes for imaging β-amyloid (Aβ) plaques. These derivatives showed binding affinities for Aβ1–40 aggregates with Ki values varying from 4.1 to 288.4 nM. (E)-5-(4-iodostyryl)-1H-indole (8) clearly stained Aβ plaques in the brain sections of Alzheimer’s disease (AD) model mice (APP/PS1). Furthermore, autoradiography for [125I]8 displayed intense and specific labeling of Aβ plaques in the brain sections mentioned above with low background. In biodistribution experiments using normal mice [125I]8 showed high initial brain uptake followed by rapid washout (4.27 and 0.64% ID/g at 2 and 30 min post injection, respectively). These findings suggests that [123I]8 may be a potential SPECT imaging agent for detecting Aβ plaques in AD brain.
The Aminocyclodextrin/Pd(OAc)<sub>2</sub>Complex as an Efficient Catalyst for the Mizoroki-Heck Cross-Coupling Reaction
作者:Kuppusamy Kanagaraj、Kasi Pitchumani
DOI:10.1002/chem.201301863
日期:2013.10.18
An aminocyclodextrin/Pd(OAc)2 complex is used as an efficient, reusable catalyst in the Mizoroki–Heck reaction of aryl halides/triflates with olefins to give carbon–carbon‐coupled products in good to excellent yields. This simple, efficient catalytic system is applicable to a wide range of aryl and heteroaryl halides/triflates and olefins. This environmentally benign procedure is less hazardous, milder
Inhibition and Dispersion of Bacterial Biofilms with 2-Aminobenzimidazole Derivatives
申请人:BLACKWELL Helen
公开号:US20130136782A1
公开(公告)日:2013-05-30
Compounds described herein inhibit biofilm formation or disperse pre-formed biofilms of Gram-negative bacteria. Biofilm-inhibitory compounds can be encapsulated or contained in a polymer matrix for controlled release. Coatings, films, multilayer films, hydrogels, microspheres and nanospheres as well as pharmaceutical compositions and disinfecting compositions containing biofilm-inhibitory compounds are also provided. Methods for inhibiting formation of biofilms or dispersing already formed biofilms are provided. Methods for treating infections of gram-negative bacteria which form biofilms, particularly those of
Pseudomonas
and more particularly
P. aeruginosa.
A Free-Radical-Promoted Site-Specific Cross-Dehydrogenative-Coupling of <i>N</i>-Heterocycles with Fluorinated Alcohols
作者:Zhengbao Xu、Zhaojia Hang、Li Chai、Zhong-Quan Liu
DOI:10.1021/acs.orglett.6b02274
日期:2016.9.16
A C–C formation of an electron-rich N-heterocycle with fluorinatedalcohol is developed. Through this radical-triggered cross-dehydrogenative coupling strategy, a wide range of useful building blocks such as C3 hydroxyfluoroalkylated indoles and pyrroles can be site-specifically synthesized. Mechanistic studies indicate a single-electron-transfer initiated radical cycle would be involved.
An efficient copper-catalyzed intermolecular hydroindolation reaction of terminal aryl alkynes to expeditiously synthesize bis(indolyl)alkanes in moderate to high yields is described. The double nucleophilic addition of two molecules of indole to one molecule of alkyne occurs in a tandem manner through an anti-Markovnikov pathway. Various arenes and alkynes allow for this transformation. Preliminary