723294-75-5Relevant articles and documents
Syntheses of 2-amino and 2-halothiazole derivatives as high-affinity metabotropic glutamate receptor subtype 5 ligands and potential radioligands for in vivo imaging
Siméon, Fabrice G.,Wendahl, Matthew T.,Pike, Victor W.
experimental part, p. 901 - 908 (2011/04/16)
The structure of the potent selective mGlu5 ligand, SP203 (1, 3-fluoro-5-[[2-(fluoromethyr)thiazol-4-yl]ethynyl]benzonitrile), was modified by replacing the 2-fluoromethyl substituent with an amino or halo substituent and by variation of substituents in the distal aromatic ring to provide a series of new high-affinity mGlu5 ligands. In this series, among the most potent ligands obtained, the 2-chloro-thiazoles 7a and 7b and the 2-fluorothiazole 10b showed subnanomolar mGlu5 affinity. 10b also displayed >10000-fold selectivity over all other metabotropic receptor subtypes plus a wide range of other receptors and binding sites. The 2-fluorothiazoles 10a and 10b were labeled using [18F]fluoride ion (t1/2 = 109.7 minin moderately high radiochemical yield to provide potential radioligands that may resist troublesome radiodefluorination during the imaging of brain mGlu 5 with position emission tomography. The iodo compound 9b has nanomolar affinity for mGlu5 and may also serve as a lead to a potential 123I-labeled ligand for imaging brain mGlu5 with single photon emission computed tomography.