The reaction of hydroxylamine with aryl trifluoromethyl-β-diketones: Synthesis of 5-hydroxy-5-trifluoromethyl-Δ2-isoxazolines and their dehydration to 5-trifluoromethylisoxazoles
作者:Vinod Kumar、Ranjana Aggarwal、Shiv P. Singh
DOI:10.1016/j.jfluchem.2006.03.009
日期:2006.7
Reaction of hydroxylamine hydrochloride with aryl trifluoromethyl-β-diketones affords 5-hydroxy-5-trifluoromethyl-Δ2-isoxazolines rather than the reported 3-trifluoromethylisoxazoles. The structural assignment is based on the analysis of their NMR (1H, 13C and 19F) spectral data and of their dehydration products, 5-trifluoromethylisoxazoles.
The present invention is concerned isoxazole-imidazole derivatives having affinity and selectivity for GABA A α5 receptor binding site, their manufacture, pharmaceutical compositions containing them and their use for enhancing cognition or for the treatment of cognitive disorders like Alzheimer's disease. In particular, the present invention is concerned with aryl-isoxazol-4-yl-imidazole derivatives of formula I
wherein R
1
, R
2
and R
3
are as described in the specification.
本发明涉及对GABA A α5受体结合位点具有亲和力和选择性的异噁唑-咪唑衍生物,其制备方法,含有它们的药物组合物以及它们用于增强认知或治疗阿尔茨海默病等认知障碍的用途。具体而言,本发明涉及式I的芳基异噁唑-4-基咪唑衍生物,其中R1、R2和R3如规范中所述。
Microwave-assisted synthesis and antimicrobial activity of 5-trihalomethyl-3-arylisoxazoles
作者:Marcos A. P. Martins、Pablo Machado、Luciana A. Piovesan、Alex F. C. Flores、Marli M. A. de Campos、Carolina Scheidt、Helio G. Bonacorso、Nilo Zanatta
DOI:10.1007/s00706-007-0849-1
日期:2008.8
A series of twelve 5-trihalomethyl-3-arylisoxazoles was synthesized and screened for antibacterial and antifungal activities. The compounds were synthesized from the cyclondensation of 1,1,1-trihalo-4-alkoxy-3-alken-2-ones [CX C-3(O)C(R-2)=C(R-1)OR, where X = Cl and F; R=Me; R-2=H; R-1=H, Me, F, Cl, Br, and NO2] with hydroxylamine hydrochloride through a rapid one-pot reaction via microwave irradiation. Some of the 5-trihalomethyl-3-arylisoxazoles exhibited good in vitro anti-Cryptococcus activity.
[EN] The present invention is concerned isoxazole-imidazole derivatives having affinity and selectivity for GABA A a5 receptor binding site, their manufacture, pharmaceutical compositions containing them and their use as medicaments. The active compounds of the present invention are useful as cognitive enhancer or for the treatment of cognitive disorders like Alzheimer's disease. In particular, the present invention is concerned with aryl-isoxazol-4-yl-imidazole derivatives of formula (I): wherein R1, R2 and R3 are as described in the specification. [FR] La présente invention porte sur des dérivés d'isoxazole-imidazole ayant une affinité et une sélectivité pour le site de liaison au récepteur GABA A a5, sur leur fabrication, sur des compositions pharmaceutiques les contenant et sur leur utilisation comme médicaments. Les composés actifs de la présente invention sont utiles comme activateur cognitif ou pour le traitement de troubles cognitifs comme la maladie d'Alzheimer. En particulier, la présente invention porte sur des dérivés d'aryl-isoxazol-4-yl-imidazole de formule (I) dans laquelle R1, R2 et R3 sont tels que décrits dans la description.