Ring-Opening Reactions of Epoxides Catalyzed by Molybdenum(VI) Dichloride Dioxide
作者:Dillip Chand、Kandasamy Jeyakumar
DOI:10.1055/s-2008-1032163
日期:2008.3
alcohols, acetonides, and α-alkoxy ketones is achieved by using molybdenum(VI) dichloride dioxide (MoO 2 Cl 2 ) as a catalyst. Alcohol, aldehyde, oxime, tosyl, and TERT-butyldimethylsilyl functional groups are tolerated during the methanolysis and acetonidation of the functionalized epoxides. No polymerization product is observed with any of the epoxides. Direct conversion of epoxides devoid of sensitive
An object of the present invention is to provide a probe for imaging a β-sheet structure protein which can be used for the diagnosis of conformational diseases, particularly disease (tauopathy) having a cardinal symptom such as intracerebral accumulation of tau protein, for example, Alzheimer's disease. Another object of the present invention is to provide a compound which is highly specific to tau and can image tau with satisfactory sensitivity, and also has high brain transition, low or non-recognized bone-seeking properties and low or non-recognized toxicity.
According to the present invention, the above problems are solved by providing a compound of a formula I (wherein A, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
a
and R
b
are as defined in the present description) or a pharmaceutically acceptable salt or solvate thereof.