Diphenylpropynone derivatives as probes for imaging β-amyloid plaques in Alzheimer’s brains
摘要:
A new series of diphenylpropynone (DPP) derivatives for use in vivo to image beta-amyloid (A beta) plaques in the brain of patients with Alzheimer's disease (AD) were synthesized and characterized. Binding experiments in vitro revealed high affinity for A beta (1-42) aggregates at a K(i) value ranging from 6 to 326 nM. Furthermore, specific labeling of plaques was observed in sections of brain tissue from Tg2576 transgenic mice stained using one of the compounds, 1. In biodistribution experiments with normal mice, [(125)I]1displayed moderate uptake (1.55% ID/g at 2 min) and clearance from the brain with time (0.76 ID/g at 60 min). Taken together, DPP can serve as a new molecular scaffold for developing novel A beta imaging agents by introducing appropriate substituted groups. (C) 2010 Elsevier Ltd. All rights reserved.
A General and Convenient Palladium-Catalyzed Carbonylative Sonogashira Coupling of Aryl Bromides
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1002/chem.201001864
日期:2010.10.25
Convenient carbonylations: An efficient methodology for the carbonylative Sonogashira reaction of aryl bromides has been developed (see scheme). Contrary to known procedures, inexpensive aryl bromides can be applied as substrates to give the desired compounds in moderate to good yields (47–88 %).
A new series of diphenylpropynone (DPP) derivatives for use in vivo to image beta-amyloid (A beta) plaques in the brain of patients with Alzheimer's disease (AD) were synthesized and characterized. Binding experiments in vitro revealed high affinity for A beta (1-42) aggregates at a K(i) value ranging from 6 to 326 nM. Furthermore, specific labeling of plaques was observed in sections of brain tissue from Tg2576 transgenic mice stained using one of the compounds, 1. In biodistribution experiments with normal mice, [(125)I]1displayed moderate uptake (1.55% ID/g at 2 min) and clearance from the brain with time (0.76 ID/g at 60 min). Taken together, DPP can serve as a new molecular scaffold for developing novel A beta imaging agents by introducing appropriate substituted groups. (C) 2010 Elsevier Ltd. All rights reserved.