- In vivo evaluation of substituted 3-amino-1,4-benzodiazepines as anti-depressant, anxiolytic and anti-nociceptive agents
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Oxazepam (CAS 604-75-1) 4 a served as building block in the synthesis of substituted 3-amino-l,4-benzodiazepines, which were subsequently tested in various CNS animal models. The hydroxy group of oxazepam was either activated as a chloride (Method A) or as a phos- phor-oxy derivative (Method B) giving the desired 3-amino-l,4-benzodiapines 6 a- 6r in high yields with primary and secondary amines in a typical nucleophilic substitution reaction. Eighteen 3-substi- tuted 1,4-benzodiazepines were prepared and served as new chemical entities and for lead structure discovery. The mixed cholecystokinin (CCK) antagonist 6 e showed anxiolytic and antidepressant effects from 10μg/kg in mice in the elevated x-maze test and the forced swimming test. The CCK 1 antagonist 6 g has shown antidepressant effects from the same dose, but lacked anxiolytic properties. Both compounds potentiated at a dose of 0.5 mg/kg morphine antinocicep- tion with a maximum possible effect (MPE) about 35 %. By assessing initially the MPE of antinocipection for the 18 newly synthesised benzodiazepines in the tail-flick test, 4 other benzodiazepines were found active. In further in vivo evaluation the cyclohexyl derivative 6 i displayed anxiolytic, antidepressant and antinociceptive properties as single agent at a dose of 5 mg/kg without toxicity. The benzodiazepines 6i and 6p, which initially showed a higher MPE in terms of morphine potentiation (43/44%) showed analgesic effects as single agents, without having anxiolytic or antidepressant properties. The amino-piperidinyl derivative 6 p displayed a similar dose-response relationship to morphine, but was 3 times more potent. ECV Editio Cantor Verlag, Aulendorf (Germany).
- Lattmann, Eric,Lattmann, Pornthip,Boonprakob, Yodchai,Airarat, Wanchai,Singh, Harjit,Offel, Michael,Sattayasai, Jintana
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scheme or table
p. 61 - 71
(2009/04/19)
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- A practical, metal-free synthesis of 1H-Lndazoles
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The synthesis of 1H-indazoles is achieved from o-aminobenzoximes by the selective activation of the oxime in the presence of the amino group. The reaction occurs with a variety of substituted o-aminobenzoximes using a slight excess of methanesulfonyl chloride and triethylamine at 0-23 °C and is amenable to scale-up. The synthesis of 1 H-indazoles under these conditions is extremely mild compared with previous synthetic approaches and affords the desired compounds in good to excellent yields.
- Counceller, Carla M.,Eichman, Chad C.,Wray, Brertda C.,Stambuli, James P.
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supporting information; experimental part
p. 1021 - 1023
(2009/04/07)
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