The synthesis, in vitro ligand binding study and in vivo Elevated Plus Maze test (EPM) of a series of pyrazolo[4,3-c]quinolin-3-ones (PQs) are reported. Multistep synthesis of PQs started from anilines and diethyl 2-(ethoxymethylene)malonate to give the quinolin-4-one nucleus, via the Gould-Jacobs reaction. These quinolinones were transformed to 4-chloroquinolines, which react with aryl-hydrazines affording the final compounds. PQs exhibited different potency in displacing specific [³H]Flunitrazepam binding from the benzodiazepine binding site at the γ-aminobutyric acid receptor (GABA_A-R) depending on the substitution of the pyrazoloquinolone nucleus. PCA helped determine how different substituents contributed to the differential behavior of the PQs studied. Compounds with high affinity for the GABA_A-R were tested regarding their anxiolytic properties in Wistar adult male rats using the Elevated Plus Maze (EPM). Thus, PQs with a p-methoxy phenyl group at N-1 (7b-ii and 7c-ii) displayed a remarkable anxiolytic activity at low doses (0.5–1.0 mg/kg). Meanwhile, PQs featuring an unsubstituted phenyl (7b-i) or p-fluoro phenyl group (7b-iii) at the N-1 showed anxiogenic effects in the EPM test.

报道了一系列吡唑并[4,3 - c ]喹啉-3-酮（PQs）的合成，体外配体结合研究和体内高架迷宫测试（EPM）。PQ的多步合成从苯胺和2-（乙氧基亚甲基）丙二酸二乙酯开始，通过Gould-Jacobs反应生成quinolin-4-one核。将这些喹啉酮转化为4-氯喹啉，使其与芳基肼反应，得到最终化合物。PQS在移位特定[表现出各种不同效价³ H]氟硝西泮从苯并二氮杂结合位点在γ氨基丁酸受体结合（GABA_甲-R）取决于吡唑并喹诺酮核的取代。PCA有助于确定不同的取代基如何促进所研究的PQ的差异行为。使用高架迷宫（EPM）在Wistar成年雄性大鼠中测试了对GABA _A -R具有高亲和力的化合物的抗焦虑特性。因此，在N-1（7b - ii和7c- ii）处带有对甲氧基苯基的PQ在低剂量（0.5-1.0 mg / kg）下显示出显着的抗焦虑活性。同时，PQS设有一个未取代的苯基（7B -我）或p -氟苯基（7B -三）N-1在EPM测试中显示出焦虑作用。