The present invention describes an improved process for the preparation of 1,2Benzisoxazole-3-methanesulphonamide (Zonisamide), a well known anti-epileptic agent which possesses anti-convulsant and anti-neurotoxic effects. Other aspect of this invention are isolation of a key intermediate, viz., crystalline sodium chloride associated 1,2Benzisoxazole-3-methane sodium sulfonate (BOS-Na:NaCl). The isolated crude BOSNa:NaCl is directly converted to Zonisamide using controlled molar ratio of chlorosulfonic acid to avoid the disulfonated side products. The analytical characteristics like IR and XRD data of the BOS-Na:NaCl are also reported to confirm its nature.
本发明描述了一种改进的制备1,2苯并
异噁唑-3-甲磺酰胺(左尼嗪)的方法,该药物是一种广为人知的抗癫痫药物,具有抗惊厥和抗神经毒性作用。本发明的其他方面包括分离关键中间体,即结晶
氯化钠相关的1,2苯并
异噁唑-3-
甲烷磺酸钠(BOS-Na:NaCl)。分离的粗BOSNa:NaCl直接转化为左尼嗪,使用控制的
氯磺酸摩尔比避免二磺化副产物。还报告了BOS-Na:NaCl的红外和XRD数据等分析特征以确认其性质。