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PubMed1990

[Studies on the synthesis of condensed pyridazine derivatives. III. Synthesis and benzodiazepine receptor binding studies of condensed triazolopyridazine derivatives].

A series of 6H-(1)benzothiopyrano[3,4-e][1,2,4]triazolo[4,3- b]pyridazines and 6,7-dihydro-(1)benzothiepino[4,5- e][1,2,4]triazolo [4,3-b]pyridazines were prepared and tested for their ability to displace [3H] diazepam from rat brain membranes. An approximately planar shape of these molecules was essential for high affinity to the benzodiazepine receptor. Among them, 11-aryl compounds in the latter series were found to have high affinity to the benzodiazepine receptor. 11-Phenyl- and 11-thienyl- 6,7-dihydro-(1)benzothiepino[4,5-e][1,2,4]triazolo[4,3- b]pyridazine (3b-5 and 3b-11 respectively) showed the potent affinity comparable to that of diazepam. The structure-activity relationships are also discussed.

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