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    • 3. 发明授权
    • Process for the preparation of
4-hydroxy-3-(heterocyclocarbamoyl)-2H-1,2-benzothiazine-1,1-dioxides
    • 制备4-羟基-3-(杂环氨基甲酰基)-2H-1,2-苯并噻嗪-1,1-二氧化物的方法
    • US4477661A
    • 1984-10-16
    • US478763
    • 1983-03-25
    • Wolfgang HerrmannWolfram GeibelGerhard Satzinger
    • Wolfgang HerrmannWolfram GeibelGerhard Satzinger
    • C07D417/12C07D401/12
    • C07D417/12
    • The present invention provides a process for the preparation of 4-hydroxy-3-(heterocyclocarbamoyl)-2H-1,2-benzothiazine-1,1-dioxides of the general formula: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl radical, R.sub.2 is a nitrogen-containing heterocyclic radical and R.sub.3 is a hydrogen or halogen atom or a methyl radical, and of the alkali metal, alkaline earth metal and amine salts thereof, by the reaction of an amine-substituted, nitrogen-containing heterocyclic compound with a halo-acetyl halide, reaction of the intermediate thus obtained with sodium benzoic acid sulphimide, ring expansion of the benzoisothiazole ring to give a benzothiazine ring and, in case R.sub.2 is to be an isoxazolyl radical, reverse rearrangement of the oxadiazole-ring formed by ring expansion to the isoxazolyl ring, wherein (in a one-pot reaction A) the reaction of an amine-substituted, nitrogen-containing heterocyclic compound with a halo-acetyl halide is carried out, without the addition of a base, in boiling ethyl acetate, the intermediate formed is, without isolation, reacted with sodium benzoic acid sulphimide and the reaction product isolated, whereafter, in a one-pot reaction B, the reaction product from the one-pot reaction A is reacted in a dipolar aprotonic solvent under an atmosphere of a protection gas with a strongly basic alkali-alkohole and thereafter with so much acid that about 2 equivalents of base remained unneutralized in the reaction solution and, if desired, the benzothiazine ring is N-methylated in the usual manner and the product obtained is, if desired, converted in known manner into an alkali metal, alkaline earth metal or amine salt.
    • 本发明提供了制备下列通式的4-羟基-3-(杂环氨基甲酰基)-2H-1,2-苯并噻嗪-1,1-二氧化物的方法:其中R 1是氢原子或甲基 自由基,R2是含氮杂环基,R3是氢或卤素原子或甲基,以及其碱金属,碱土金属和胺盐,通过胺取代的含氮杂环 与卤代 - 乙酰卤的化合物,由此获得的中间体与苯甲酸亚磺酰亚胺的反应,苯并异噻唑环的环扩展得到苯并噻嗪环,并且在R2为异恶唑基的情况下,恶二唑环的反向重排 通过环扩展形成异恶唑环,其中(在一锅反应A)中,胺取代的含氮杂环化合物与卤代 - 乙酰卤的反应在不加碱的情况下进行 沸腾等 乙酸乙酯,形成的中间体不经分离,与苯甲酸亚磺酰亚胺反应,分离出反应产物,然后在一锅反应B中,来自一锅反应A的反应产物在偶极非质子溶剂 在具有强碱性碱性碱性气体的保护气体的气氛下,然后用如此多的酸使约2当量的碱在反应溶液中保持未中和,如果需要,苯并噻嗪环以常规方式进行N-甲基化,并且 如果需要,获得的产物以已知的方式转化为碱金属,碱土金属或胺盐。