Journal article Open Access
Damont, Annelaure; Marguet, Frank; Puech, Frédéric; Dollé, Frédéric
SSR180575 (1) is a high-affinity (0.83 nM) TSPO 18 kDa ligand belonging to the pyridazino[4,5-b]indole-1-acetamides family. Herein we describe the synthesis and in vitro characterization of two series of new fluorinated analogues. Eleven compounds (out of fifteen) displayed nanomolar to subnamolar affinities (0.30-8.1 nM) and high selectivities (Ki(CBR)/Ki(TSPO) > 10(3)). Two derivatives stand out as promising candidates for drug development or use as PET probes for in vivo neuroinflammation imaging, once fluorine-18-labelled.