Selenium-Catalyzed Regioselective Cyclization of Unsaturated Carboxylic Acids Using Hypervalent Iodine Oxidants
作者:Fateh V. Singh、Thomas Wirth
DOI:10.1021/ol202800k
日期:2011.12.16
A new and convenient selenium-catalyzed regioselective cyclization of γ,δ-unsaturated carboxylicacids to the corresponding 3,6-dihydro-2H-pyran-2-ones is described. The cyclization products have been obtained in good to excellent yields using diphenyl diselenide as a catalyst and [bis(trifluoroacetoxy)iodo]benzene as a stoichiometric oxidant.
(EN) A phosphonic acid derivative which is useful for medically treating hyperlipemia, represented by general formula (I) or a pharmacologically acceptable salt thereof. Representative example of the compound according to the present invention is one represented by formula (II).(FR) Un dérivé d'acide phosphonique utile dans le traitement médical de l'hyperlipémie, représenté par la formule générale (I), ou sel pharmacologiquement acceptable de ce dérivé. Un exemple représentatif de composé conçu selon la présente invention est illustré par la formule (II).