[EN] AN IMPROVED PROCESS FOR THE PRODUCTION OF DERIVATIVES OF THIOZOLIDINEDIONES AND THEIR PRECURSORS<br/>[FR] PROCEDE AMELIORE POUR LA PRODUCTION DE DERIVES DE THIOZOLIDINEDIONES ET DE LEURS PRECURSEURS
申请人:MOREPEN LAB LTD
公开号:WO2006035459A1
公开(公告)日:2006-04-06
The invention provides a process for preparing derivatives of thiozolidinediones and their precursors comprising, (a) reacting a compound of general formula I wherein R1, R2 and R3 may be same or different and represent H, alkyl or alkoxy with C varying from 1 to 6, halogens, mono or di-substituted alkyl and aryl amines, and M represents hydrogen (H) or alkali metal selected from Na, K or Li with a compound of formula II, wherein R4 has the same meaning as R1 or R2 or R3 and X is halogen in presence or absence of solvent(s) under effective conditions to produce nitro ethers of general formula III, where in R1 to R4 has the same meaning as given above, provided when M is H and not its alkali metal salt, an alkali metal salt such as hydroxide or carbonate is required to be added while conducting the said reaction, (b) subjecting the said nitro ethers, with or without isolation, to Raney nickel-catalyzed reduction under conditions effective to produce corresponding nitro aniline ethers (c) coupling the said aniline ether with acrylates under Meerwein arylation conditions in presence of hydrobromic acid to produce α bromo substituted carboxylic acid derivatives followed by subjecting to solvent extractive purification (d) cyclising the purified derivative of α bromo substituted carboxylic acid as obtained in step (c) with thiourea to yield 2-imino -4-thiazolidinones then (e) hydrolyzing the said 2-imino-4-thiazolidinones to produce 2, 4-thiazolidinones and converting the same to its hydrochloride salts as white crystalline solids known to exhibit antidiabetic activity, by conventional methods.
该发明提供了一种制备噻唑烷二酮及其前体衍生物的过程,包括:(a)将通式I的化合物与通式II的化合物反应,在有效条件下生成通式III的硝基醚,其中R1至R4具有相同的含义,并在M为H而非其碱金属盐时,需要加入羟基或碳酸盐等碱金属盐,(b)将所述硝基醚在Raney镍催化还原条件下还原,生成相应的硝基苯胺醚,(c)在Meerwein芳基化条件下,将所述苯胺醚与丙烯酸酯耦合,在氢溴酸存在下生成α-溴取代的羧酸衍生物,然后经溶剂萃取纯化,(d)将步骤(c)中获得的纯化的α-溴取代的羧酸衍生物与硫脲环化,生成2-亚氨基-4-噻唑烷酮,然后(e)水解所述的2-亚氨基-4-噻唑烷酮,生成2,4-噻唑烷二酮,并通过常规方法将其转化为其盐酸盐,作为白色结晶固体,已知具有抗糖尿病活性。