SYNTHESIS AND ANALGESIC EFFECTS OF 3-SUBSTITUTED 4,6-DIARYLPYRIDAZINEDERIVATIVES OF THE ARYLPIPERAZINE CLASS

A new series of 4,6-diaryl pyridazines substituted in the 3-position b y arylpiperazinyl moieties was synthesized and evaluated for analgesic activity. Five out of the nine tested compounds possessed significant antinociceptive effects in the phenylbenzoquinone-induced writhing te st (PBQ test) with ED50 values ranging from 26.0 to 37.7 mg/kg ip. The most active derivatives 2a, 2d and 2h had a low toxicity (LD50 > 800 mg/kg ip) but showed some sedative and neurotoxic effects from the dos e of 50 mg/kg ip. The three selected pyridazines were devoid of activi ty in the hot-plate test. However, analgesic activity of 2d and 2h was significantly reversed by naloxone in the PBQ test. Administered at t he low dose of 5 mg/kg ip, 2h greatly potentiated the antinociceptive response induced by morphine (0.15 mg/kg sc). In addition, analgesic e ffects of 2h (2.5 mg/kg ip) were also potentiated by 5-hydroxytryptoph an combined with carbidopa. These results suggest that pyridazine 2h i nduces analgesia, which is mediated via both opioid and serotonergic m echanisms. (C) 1997 Elsevier Science Ltd.