申请人:Warner-Lambert Company
公开号:US04076722A1
公开(公告)日:1978-02-28
This invention relates to a process for the preparation of 1-[5-(4-hydroxy-2H-1,2-benzothiazin-3-yl)-1,2,4-oxadiazol-3-yl]methyl}eth anone S,S-dioxide (III), a novel intermediate useful in the preparation of the known anti-inflammatory agent, 4-hydroxy-3-(5-methyl-3-isoxazolylcarbamoyl)-2-methyl-2H-1,2-benzothiazine 1,1-dioxide (IV). According to the process of this invention, the saccharin compound, 2,3-dihydro-N-(5-methyl-3-isoxazolyl)-3-oxo-1,2-benzisothiazole-2-acetamid e 1,1-dioxide (I) is reacted with an alkali metal alkoxide of a lower alcohol in an inert solvent at temperatures below 30.degree. C. to form the benzenesulfonylglycineamide, alkyl 2-[([(5-methyl-3-isoxazolyl)amino]carbonyl}methyl)amino]sulfonyl}benzoat e (II), which is ring closed and rearranged by reaction with an alkali metal alkoxide of a lower alcohol in an inert solvent at temperatures of from 60.degree. to 70.degree. C. to form the desired oxadiazole compound III.
本发明涉及一种制备1-[5-(4-羟基-2H-1,2-苯并噻唑-3-基)-1,2,4-噁二唑-3-基]甲基}乙酮S,S-二氧化物(III)的方法,该方法是制备已知的抗炎药物4-羟基-3-(5-甲基-3-异噁唑基)氨基甲酰基-2-甲基-2H-1,2-苯并噻嗪-1,1-二氧化物(IV)的有用中间体。根据本发明的方法,在惰性溶剂中,在低于30°C的温度下,将糖精化合物2,3-二氢-N-(5-甲基-3-异噁唑基)-3-氧代-1,2-苯并异噁唑-2-乙酰胺-1,1-二氧化物(I)与低级醇的碱金属醇盐反应,形成苯磺酰甘氨酸酰胺,烷基2-[([(5-甲基-3-异噁唑基)氨基]羰基}甲基)氨基]磺酰}苯甲酸酯(II),然后在惰性溶剂中,在60°C至70°C的温度下,通过与低级醇的碱金属醇盐反应,使其环闭合并重排,形成所需的噁二唑化合物III。