o-Nitroaniline derivatives. Part 14.1,2 Cyclisations leading to benzimidazole N-oxides, N-hydroxybenzimidazolones and N-hydroxyquinoxaline-2,3-diones: a mechanistic borderline
An invention relating to Imidazo[1,5-a]quinoxalines (I) ##STR1## which do not contain an endocyclic carbonyl group and which are useful as anxiolytic and sedative/hypnotic agents.
A new route to -hydroxyquinoxaline-2,3-diones and some aza-analogues
作者:Michael D. McFarlane、David M. Smith
DOI:10.1016/s0040-4039(01)91374-7
日期:1987.1
Reactions of -(-nitroaryl)sarcosine esters with bases give 1-hydroxy-4-methyl-quinoxaline-2,3-diones as the principal products; the corresponding reactions of -(3-nitro-2-pyridyl)sarcosine esters give 1-hydroxy-4-methylpyrido[2,3-]pyrazine-2,3-diones. The significance of these results, in relation to a general mechanism for nitro-group condensations, is discussed.
The invention discloses imidazo[1,5-a]quinoxalines (I) ##STR1## which do not contain an endocyclic carbonyl group that are useful as anxiolytic and sedative/hypnotic agents.
High-Affinity Partial Agonist Imidazo[1,5-<i>a</i>]quinoxaline Amides, Carbamates, and Ureas at the γ-Aminobutyric Acid A/Benzodiazepine Receptor Complex
作者:E. Jon Jacobsen、Ruth E. TenBrink、Lindsay S. Stelzer、Kenneth L. Belonga、Donald B. Carter、Haesook K. Im、Wha Bin Im、Vimala H. Sethy、Andy H. Tang、Philip F. VonVoigtlander、James D. Petke
DOI:10.1021/jm940765f
日期:1996.1.1
A series of imidazo[1,5-alpha]quinoxaline amides, carbamates, and ureas which have high affinity for the gamma-aminobutyric acid A/benzodiazepine receptor complex was developed. Compounds within this class have varying efficacies racing from antagonists to full agonists. However, most analogs were found to be partial agonists as indicated by [S-35]TBPS and Cl- current ratios. Many of these compounds were also effective in antagonizing metrazole-induced seizures in accordance with anticonvulsant and possible anxiolytic activity. Selected quinoxalines displayed limited benzodiazepine-type side effects such as ethanol potentiation and physical dependence in animal models. Dimethylamino urea 41 emerged as the most interesting analog, having a partial agonist profile in vitro while possessing useful activity in animal models of anxiety such as the Vogel and Geller assays. In accordance with its partial agonist profile, 41 was devoid of typical benzodiazepine side effects.