Novel anilinophthalimide derivatives as potential probes for β-amyloid plaque in the brain
摘要:
A group of novel 4,5-dianilinophthalimide derivatives has been synthesized in this study for potential use as beta-amyloid (A beta) plaque probes. Staining of hippocampus tissue sections from Alzheimer's disease (AD) brain with the representative compound 9 indicated selective labeling of it to A beta plaques. The binding affinity of radioiodinated [I-125]9 for AD brain homogenates was 0.21 nM (K-d), and of other derivatives ranged from 0.9 to 19.7 nM, except for N-methyl-4,5-dianilinophthalimide (K-i > 1000 nM). [I-125]9 possessed the optimal lipophilicity with Log P value of 2.16, and its in vivo biodistribution in normal mice exhibited excellent initial brain uptake (5.16% ID/g at 2 min after injection) and a fast washout rate (0.56% ID/g at 60 min). The encouraging results suggest that this novel derivative of [I-123]9 may have potential as an in vivo SPECT probe for detecting amyloid plaques in the brain. (C) 2009 Elsevier Ltd. All rights reserved.
Redox-Neutral Cross-Coupling Amination with Weak <i>N-</i>Nucleophiles: Arylation of Anilines, Sulfonamides, Sulfoximines, Carbamates, and Imines via Nickelaelectrocatalysis
A nickel-catalyzed cross-coupling amination with weak nitrogen nucleophiles is described. Arylhalides as well as aryl tosylates can be efficiently coupled with a series of weak N-nucleophiles, including anilines, sulfonamides, sulfoximines, carbamates, and imines via concerted paired electrolysis. Notably, electron-deficient anilines and sulfonamides are also suitable substrates. Interestingly, when