The present invention relates to a process of preparing benzisoxazole methane sulfonic acid-chloride (BOS-Cl) as an zonisamide intermediate via chlorination of benzisoxazole methane sulfonate. The present invention also disloses a process of preparing zonisamide via amidation of BOS-Cl. More particularly, the present invention provides a process of preparing zonisamide, comprising the steps of: a) chlorinating BOS, salts or esters thereof, with SOCl
2
in an organic solvent and/or in the presence of a catalyst to form BOS-Cl; and b) amidating BOS-Cl in the presence of ammonia selected from the group consisting of aqueous ammonia in a biphasic system, masked ammonia and dry ammonia to form zonisamide.
本发明涉及一种制备苯并
异噁唑甲烷磺酸氯化物(BOS-Cl)作为唑尼沙米德中间体的过程,通过对苯并
异噁唑甲烷磺酸盐进行
氯化而得到。本发明还公开了一种通过BOS-Cl酰胺化制备唑尼沙米德的过程。更具体地,本发明提供了制备唑尼沙米德的过程,包括以下步骤:a)用SOCl2在有机溶剂和/或催化剂存在下
氯化BOS、其盐或酯,形成BOS-Cl;和b)在选自双相系统中的
水氨、掩蔽
氨和干
氨的
氨存在下,使BOS-Cl酰胺化,形成唑尼沙米德。