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- W2065016867 abstract "A series of pyrazolo[4,3-c]pyrrolo[3,2-f]quinolin-3-one derivatives 6, 7a–c, 8a,b, 9a,b and 10–12 were synthesized as modified pyrazoloquinolinone analogs (PQs) and evaluated for their ability to inhibit radioligand to central and peripheral benzodiazepine receptors (BZRs) and their effect on GABAA α1β2γ2L receptors expressed in Xenopus laevis oocytes. Multistep synthesis starting from 5-nitroindole, via the Gould–Jacobs reaction to the quinoline nucleus, yielded key intermediates 9-chloro-3H-pyrrolo[3,2-f]quinoline-8-carboxylates. The reaction of the latter with methyl-hydrazine and various phenyl-hydrazines furnished the final compounds. In order to confirm the expected tetracyclic 2-substituted-2H-pyrazolopyrroloquinolin-3-one structure, IR spectrophotometric, mono-1H and 13C and bi-dimensional spectrometric and HRMS analyses were carried out: all compounds were found to be 2-substituted 3-keto tautomers; compound 6 only differed because it turned out to be 1-methyl-2H-pyrazolo[4,3-c]pyrrolo[3,2-f]quinolin-3-olo. The results of this work are consistent with those previously reported for PQs: 7–9 show high potency in displacing specific [3H]flunitrazepam from its receptor site; no compound was active in inhibiting the binding of [3H]PK 11195. They all act as antagonists at central BZR." @default.
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- W2065016867 date "2005-05-01" @default.
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- W2065016867 title "Novel anellated pyrazoloquinolin-3-ones: synthesis and in vitro BZR activity" @default.
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- W2065016867 doi "https://doi.org/10.1016/j.bmc.2005.02.042" @default.
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