[EN] AN IMPROVED PROCESS FOR PREPARING 2-OXINDOLES OF FORMULA I, A KEY RAW MATERIAL FOR MAKING PHARMACEUTICAL DRUGS AND INTERMEDIATES THEREOF<br/>[FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE 2-OXINDOLES DE FORMULE I, UNE MATIÈRE PREMIÈRE CLÉ POUR LA FABRICATION DE MÉDICAMENTS ET DE LEURS INTERMÉDIAIRES
申请人:ARCH PHARMALABS LTD
公开号:WO2013093928A1
公开(公告)日:2013-06-27
The present invention provides an improved processes having practical utility for preparing 2-oxindoles of formula I comprising preparation of 2-nitroarylmalonate diester of formula II as first intermediate and subsequent insitu reductive cyclisation using metal acid combination and its modified work-up to form compound of formula I free from metal generated impurity of formula M(OH)X wherein M is metal cation and X is anion. R is selected from hydrogen, linear, branched or cyclic alkyl, aryl, substituted aryl, heteroaryl, haloalkyl like CF3, alkoxy, haloalkoxy, thioalkyl and halogen preferably chloro Formula I wherein R' and R" are same or different and is selected from linear.branched and cyclic alkyl (C1C4groups)preferably methyl R is selected from hydrogen, linear, branched or cyclic alkyl, aryl, substituted aryl, heteroaryl, haloalkyl like CF3, alkoxy, haloalkoxy, thioalkyl and halogen preferably chloro Formula II.
本发明提供了一种改进的工艺,具有制备式I的2-氧吲哚的实用性,包括制备式II的2-硝基芳基丙二酸二酯作为第一中间体,并随后在原位还原环化使用金属酸组合物和其改性工作,以形成式I的化合物,该化合物不含金属生成的式M(OH)X的杂质,其中M是金属阳离子,X是阴离子。R选自氢,线性,支链或环烷基,芳基,取代芳基,杂芳基,类似CF3的卤代烷基,烷氧基,卤代烷氧基,硫代烷基和卤素,最好是氯代。其中R'和R"相同或不同,选自线性,支链和环烷基(C1-C4基团),最好是甲基。式I,其中R选自氢,线性,支链或环烷基,芳基,取代芳基,杂芳基,类似CF3的卤代烷基,烷氧基,卤代烷氧基,硫代烷基和卤素,最好是氯代。式II。