Development of Radioiodinated Benzofuran Derivatives for in Vivo Imaging of Prion Deposits in the Brain
摘要:
Prion diseases are fatal neurodegenerative disorders associated with the deposition of abnormal prion protein aggregates (PrPSc) in the brain tissue. Here, we report the development of I-125-labeled iodobenzofuran (IBF) derivatives as single photon emission computed tomography (SPECT) imaging probes to detect cerebral PrPSc deposits. We synthesized and radioiodinated several 5-IBF and 6-IBF derivatives. The IBF derivatives were evaluated as prion imaging probes using recombinant mouse prion protein (rMoPrP) aggregates and brain sections of mouse-adapted bovine spongiform encephalopathy (mBSE)-infected mice. Although all the IBF derivatives were strongly adsorbed on the rMoPrP aggregates, [I-125]5-IBF-NHMe displayed the highest adsorption rate and potent binding affinity with an equilibrium dissociation constant (K-d) of 12.3 nM. Fluorescence imaging using IBF-NHMe showed clear signals of the PrPSc-positive amyloid deposits in the mBSE-infected mouse brains. Biodistribution studies in normal mice demonstrated slow uptake and clearance from the brain of I-125-IBF derivatives. Among the derivatives, [I-125]6-IBF-NH2 showed the highest peak brain uptake [2.59% injected dose (ID)/g at 10 min] and good clearance (0.51% ID/g at 180 min). Although the brain distribution of IBF derivatives should still be optimized for in vivo imaging, these compounds showed prospective binding properties to PrPSc. Further chemical modification of these IBF derivatives may contribute to the discovery of clinically applicable prion imaging probes.
通过硝基环氧化物和水杨醛之间的无催化剂反应合成不同的苯并呋喃衍生物。在所采用的方法中,已在110°C下使用K 2 CO 3和DMF,反应12小时后以33-84%的收率完成反应。使用3-硝基水杨醛可获得最高的收率。最后,提出了一种可行的反应机理,并为该机理提供了一些证据,例如检测释放的乙酸根阴离子(使用FTIR)以及分离和确定关键中间体的结构。
[EN] INHIBITORS OF HEPATITIS C VIRUS REPLICATION<br/>[FR] INHIBITEURS DE LA RÉPLICATION DU VIRUS DE L'HÉPATITE C
申请人:MERCK SHARP & DOHME
公开号:WO2010111483A1
公开(公告)日:2010-09-30
The present invention relates to compounds of formula (I) that are useful as hepatitis C virus (HCV) NS5A inhibitors, the synthesis of such compounds, and the use of such compounds for inhibiting HCV NS5A activity, for treating or preventing HCV infections and for inhibiting HCV viral replication and/or viral production in a cell-based system.
The present invention relates to compounds of formula (I) that are useful as hepatitis C virus (HCV) NS5A inhibitors, the synthesis of such compounds, and the use of such compounds for inhibiting HCV NS5A activity, for treating or preventing HCV infections and for inhibiting HCV viral replication and/or viral production in a cell-based system.
Development of a one-pot sequential Sonogashira coupling for the synthesis of benzofurans
作者:Márton Csékei、Zoltán Novák、András Kotschy
DOI:10.1016/j.tet.2008.05.100
日期:2008.9
couplings and deprotection steps concluded by a ring closure. The developed one-pot procedure was compared with the stepwise approach and its efficiency was also demonstrated by the total synthesis of vignafuran, a benzofuran natural product.