Benzodiazepine receptor ligands. 7. Synthesis and pharmacological evaluation of new 3-esters of the 8-chloropyrazolo[5,1-c][1,2,4]benzotriazine 5-oxide. 3-(2-Thienylmethoxycarbonyl) derivative: an anxioselective agent in rodents.

ABSTRACT

The synthesis and binding study of new 8-chloropyrazolo[5,1-c][1,2,4]benzotriazine 5-oxide 3-ester compounds are reported. A pharmacological evaluation of the high-affinity ligands 1-4 belonging to the 3-heteroarylester series is made. The 3-(2-thienylmethoxycarbonyl) derivative 4 stands out from the other heteroarylesters and is found, using nine different behavioral methods, to be a functionally selective ligand in vivo it shows anxiolytic-like activity in the conflict models (light-dark box and plus maze test) similarly to diazepam, without any sedative and amnesic properties or interference from alcohol.