A1 Refereed original research article in a scientific journal
Fluorinated analogues of marsanidine, a highly α2-AR/imidazoline I1 binding site-selective hypotensive agent. Synthesis and biological activities.
Authors: Wasilewska A, Sączewski F, Hudson AL, Ferdousi M, Scheinin M, Laurila JM, Rybczyńska A, Boblewski K, Lehmann A
Publisher: Elsevier
Publication year: 2014
Journal: European Journal of Medicinal Chemistry
Volume: 87
First page : 386
Last page: 397
Number of pages: 12
ISSN: 0223-5234
DOI: https://doi.org/10.1016/j.ejmech.2014.09.083
The aim of these studies was to establish the influence of fluorination of the indazole ring on the pharmacological properties of two selective α2-adrenoceptor (α2-AR) agonists: 1-[(imidazolidin-2-yl)imino]-1H-indazole (marsanidine, A) and its methylene analogue 1-[(4,5-dihydro-1H-imidazol-2-yl)methyl]-1H-indazole (B). Introduction of fluorine into the indazole ring of A and B reduced both binding affinity and α2-AR/I1 imidazoline binding site selectivity. The most α2-AR-selective ligands were 6-fluoro-1-[(imidazolidin-2-yl)imino]-1H-indazole (6c) and 7-fluoro-1-[(imidazolidin-2-yl)imino]-1H-indazole (6d). The in vivo cardiovascular properties of fluorinated derivatives of A and B revealed that in both cases the C-7 fluorination leads to compounds with the highest hypotensive and bradycardic activities. The α2-AR partial agonist 6c was prepared as a potential lead compound for development of a radiotracer for PET imaging of brain α2-ARs.
