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.
[EN] NEW INDANYLOXYDIHYDROBENZOFURANYLACETIC ACID DERIVATIVES AND THEIR USE AS GPR40 RECEPTOR AGONISTS<br/>[FR] NOUVEAUX DÉRIVÉS D'ACIDE INDANYLOXYDIHYDROBENZOFURANNYLACÉTIQUE ET LEUR UTILISATION COMME AGONISTES DU RÉCEPTEUR GPR40
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2013144098A1
公开(公告)日:2013-10-03
The present invention relates to compounds of general formula (I), wherein the groups R1, R2 and m are defined as in claim 1, which have valuable pharmacological properties, in particular bind to the GPR40 receptor and modulate its activity. The compounds are suitable for treatment and prevention of diseases which can be influenced by this receptor, such as metabolic diseases, in particular diabetes type 2.
Haloacetylated enol ethers. 7 . Synthesis of 3-aryl-5-trihalomethylisoxazoles and 3-aryl-5-hydroxy-5-trihalomethyl-4,5-dihydroisoxazoles
作者:Marcos A. P. Martins、Geonir M. Siqueira、Giovani P. Bastos、Helio G. Bonacorso、Nilo Zanatta
DOI:10.1002/jhet.5570330612
日期:1996.11
cyclocondensed with hydroxylamine hydrochloride to afford the 3-aryl-5-hydroxy-5-trihalomethyl-4,5-dihydroisoxazoles 3a-g, 4a-f in good yield. The dehydratation of compounds 3a-g with concentrated sulfuric acid, led the corresponding 3-aryl-5-trichloromethylisoxazoles 5a-g. An alternative one-pot procedure yields 3-aryl-5-trihalomethylisoxazoles 5,6a-g directly by cyclocondesation of 1,2a-g with hydroxylamine
β-芳基-β-甲氧基乙烯基三卤甲基酮1a-g,2a-g [芳基= p -YC 6 H 4,其中Y = H,Me,OMe,F,Cl,Br,NO 2 ]与羟胺盐酸盐环缩合得到3-芳基-5-羟基-5-三卤甲基-4,5-二氢异恶唑3a-g,4a-f具有良好的收率。用浓硫酸使化合物3a-g脱水,得到相应的3-芳基-5-三氯甲基异恶唑5a-g。另一种一锅法直接通过1,2a-g的环缩构反应生成3-芳基-5-三卤代甲基异恶唑5,6a -g 在过量浓盐酸存在下,用盐酸羟胺处理。
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.
NEW INDANYLOXYDIHYDROBENZOFURANYLACETIC ACID DERIVATIVES AND THEIR USE AS GPR40 RECEPTOR AGONISTS