[EN] IMPROVED PROCESS FOR THE PREPARATION OF INTERMEDIATES USEFUL FOR THE PREPARATION OF ZONISAMIDE<br/>[FR] PROCEDE AMELIORE DE FABRICATION D'INTERMEDIAIRES UTILISES POUR L'OBTENTION DE ZONISAMIDE
申请人:SUVEN LIFE SCIENCES LTD
公开号:WO2005030738A1
公开(公告)日:2005-04-07
The invention relates to an improved process for the preparation of 1,2-benzisoxazole-3-methane sulfonates and a novel compound 4-oximino-2,3-dihydrobenzoxathiin-2, 2-dioxides. The 1,2-benzisoxazole-2-methane sulfonates and 4-oximino-2, 3-dihydrobenzoxathiin-2, 2-dioxides prepared by the processes of the present invention have the general formula (2) & (3) respectively . The compounds of the formulae (2) and (3) are important intermediates for the preparation of Zonisamide of the formula (1) (an anticonvulsant drug). The compounds of the formula (2) is prepared from hitherto unknown compound 4-oximino-2,3-dihydrobenzoxathiin-2, 2-dioxides of the formula (3) using strong bases with suitable solvents. The novel compounds of the formula (3) is prepared by the intramolecular Cyclocondensation of the compound of the formula (4) to get the compound of the formula (5) and subsequent reaction with hydroxylamine hydrochloride to get the novel intermediates of the formula (3). In the above mentioned formulae R1 to R4 - may be the same or different and represents hydrogen, alkyl, (with carbons, 2-5), chloro, bromo, S- alkyl, o- alkyl, NO2, N- Me2, CF3. and where X represents Na or K.
本发明涉及一种改进的制备1,2-苯并异噁唑-3-甲烷磺酸盐和一种新型化合物4-羟肟基-2,3-二氢苯并噻吩-2,2-二氧化物的过程。通过本发明的方法制备的1,2-苯并异噁唑-2-甲烷磺酸盐和4-羟肟基-2,3-二氢苯并噻吩-2,2-二氧化物分别具有通式(2)和(3)。式(2)和(3)的化合物是制备抗癫痫药扎尼酰胺的重要中间体。式(2)的化合物是由迄今未知的化合物4-羟肟基-2,3-二氢苯并噻吩-2,2-二氧化物(式(3))使用适当的溶剂和强碱制备而成。式(3)的新型化合物是通过分子内环合成反应制备的,其反应方式是将式(4)的化合物进行环合成反应得到式(5)的化合物,然后与盐酸羟肟酸反应得到新型中间体的化合物(3)。在上述式中,R1至R4可能相同或不同,并且代表氢、烷基(碳数为2-5)、氯、溴、S-烷基、o-烷基、NO2、N-Me2、CF3,X代表Na或K。