1132827-30-5Relevant articles and documents
Synthesis and evaluation of 11C-labeled imidazo[2,1-b] benzothiazoles (IBTs) as PET tracers for imaging β-amyloid plaques in Alzheimer's disease
Yousefi, Behrooz H.,Manook, André,Drzezga, Alexander,Reutern, Boris V.,Schwaiger, Markus,Wester, Hans-Jürgen,Henriksen, Gjermund
, p. 949 - 956 (2011/04/24)
We report a novel series of 11C-labeled imidazo[2,1-b] benzothiazoles (IBTs) as tracers for imaging of cerebral β-amyloid (Aβ) deposits in patients with Alzheimer's disease (AD) by means of positron emission tomography (PET). From a series of 11 compounds, candidates were identified to have a high binding affinity for Aβ. Selected compounds were prepared as O- or N-[11C]methyl derivatives and shown to have a high initial brain uptake in wild-type mice (range 1.9-9.2% I.D./g at 5 min). 2-(p-[11C]Methylaminophenyl)-7-methoxyimidazo[2,1-b] benzothiazole ([11C]5) was identified as a lead based on the combined favorable properties of high initial brain uptake, rapid clearance from normal brain, and high in vitro affinity for Aβ1-40 (Ki = 3.5 nM) and Aβ1-42 (5.8 nM), which were superior to the Pittsburgh compound B (1a). In an APP/PS1 mouse model of AD (Tg), we demonstrate a specific uptake of [11C]5 in Aβ-containing telencephalic brain regions by means of small-animal PET that was confirmed by regional brain biodistribution, ex vivo autoradiography, and immunohistochemistry. Analysis of brain sections of Tg mice receiving a single bolus injection of [11C]5 and [ 3H]1a together revealed that the tracers bind to Aβ plaques in the brain of Tg mice in a comparable pattern. Taken together, these data suggest that IBTs represent useful PET imaging agents for high-sensitivity detection of Aβ plaques.
Identification of N-(5-tert-butyl-isoxazol-3-yl)-N′-{4-[7-(2- morpholin-4-yl-ethoxy)imidazo-[2,1-b][1,3]benzothiazol-2-yl]phenyl}urea dihydrochloride (AC220), a uniquely potent, selective, and efficacious FMS-like tyrosine kinase-3 (FLT3) inhibitor
Chao, Qi,Sprankle, Kelly G.,Grotzfeld, Robert M.,Lai, Andiliy G.,Carter, Todd A.,Velasco, Anne Marie,Gunawardane, Ruwanthi N.,Cramer, Merryl D.,Gardner, Michael F.,James, Joyce,Zarrinkar, Patrick P.,Patel, Hitesh K.,Bhagwat, Shripad S.
supporting information; experimental part, p. 7808 - 7816 (2010/09/08)
Treatment of AML patients with small molecule inhibitors of FLT3 kinase has been explored as a viable therapy. However, these agents are found to be less than optimal for the treatment of AML because of lack of sufficient potency or suboptimal oral pharma