Process for the preparation of 2(3H)-benzothiazolones
    2.
    发明授权
    Process for the preparation of 2(3H)-benzothiazolones 失效
    制备2(3H) - 苯并噻唑酮的方法

    公开(公告)号:US5594145A

    公开(公告)日:1997-01-14

    申请号:US232748

    申请日:1994-04-25

    IPC分类号: C07D277/68

    CPC分类号: C07D277/68

    摘要: The process for the preparation of 2(3H)-benzothiazolones which are optionally substituted on the benzene ring by reacting a 2-aminobenzothiazole which is optionally substituted on the benzene ring with a diazotization agent in the presence of aqueous hydrochloric acid, if appropriate with addition of a chloride, to give a diazonium chloride, reacting the diazonium chloride directly to give a 2-chlorobenzothiazole, which is optionally substituted on the benzene ring, and hydrolyzing the 2-chlorobenzothiazole, without intermediate isolation, at 120.degree.-200.degree. C. under reaction pressure.

    摘要翻译: 制备任选在苯环上取代的2(3H) - 苯并噻唑酮的方法,如果合适,加入盐酸盐酸盐,在苯环上任选取代的2-氨基苯并噻唑与重氮化试剂反应 的氯化物,得到重氮氯化物,直接使重氮化钾反应,得到在苯环上任意取代的2-氯苯并噻唑,并在120℃-200℃下水解2-氯苯并噻唑,无需中间分离。 在反应压力下。

    Process for preparing 1-nitrobenzene-2-alkyloxycarbonyl-5-carboxylic
acids
    4.
    发明授权
    Process for preparing 1-nitrobenzene-2-alkyloxycarbonyl-5-carboxylic acids 失效
    制备1-硝基苯-2-烷氧基羰基-5-羧酸的方法

    公开(公告)号:US4507491A

    公开(公告)日:1985-03-26

    申请号:US445008

    申请日:1982-11-29

    CPC分类号: C07C201/14

    摘要: To prepare a 1-nitrobenzene-2-alkyloxycarbonyl-5-carboxylic acid, a dialkyl benzene-1,4-dicarboxylate is first nitrated in a customary manner and the dialkyl 1-nitrobenzene-2,5-dicarboxylate compound obtained is subjected to a partial acidic ester hydrolysis without isolating the nitro compound prepared as an intermediate. The acidic ester hydrolysis is carried out in the presence of a catalytic amount of an organic solvent which is completely or partially miscible with water and has a boiling point of above 90.degree. C. and/or of an emulsifier; it is preferably carried out at a temperature between 65.degree. and 110.degree. C.

    摘要翻译: 为了制备1-硝基苯-2-烷氧基羰基-5-羧酸,以常规方式首先硝化二苯基-1,4-二羧酸二烷基酯,将得到的1-硝基苯-2,5-二羧酸二烷基酯化合物 不分离作为中间体制备的硝基化合物的部分酸性酯水解。 酸性酯水解在催化量的与水完全或部分混溶并且沸点高于90℃的有机溶剂和/或乳化剂的存在下进行; 优选在65℃〜110℃的温度下进行。