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    • 1. 发明授权
    • Preparation of 5-fluoro-2-phenyl-4H-3,1-benzoxazin-4-ones
    • 制备5-氟-2-苯基-4H-3,1-苯并恶嗪-4-酮
    • US4562254A
    • 1985-12-31
    • US655726
    • 1984-09-28
    • Jurgen VarwigGerhard HamprechtWolfgang Rohr
    • Jurgen VarwigGerhard HamprechtWolfgang Rohr
    • C07D265/22C07D265/10
    • C07D265/22
    • 5-Fluorobenzoxazinones (I) ##STR1## where R is hydrogen, halogen, C.sub.1 -C.sub.3 -alkyl, or trifluoromethyl, trifluoromethoxy, chlorodifluoromethoxy, difluoromethoxy, tetrafluoroethoxy, trifluoromethylmercapto or chlorodifluoromethylmercapto in the m- or p-position, are prepared by reacting the corresponding benzoxazinone (II) ##STR2## in particular one which is 5-chloro-substituted or 5-bromo-substituted, with a fluoride, in particular potassium fluoride, in the presence or absence of a solvent, by a process in which the reaction is carried out in the absence of water or using previously dried starting materials, and in the presence or absence of a decomposition inhibitor, drying preferably being carried out by treatment with an acid halide, e.g. thionyl chloride, and the inhibitor used being a metal iodide, e.g. sodium iodide, or iodine.
    • 制备5-氟苯并恶嗪酮(I)其中R是氢,卤素,C 1 -C 3 - 烷基或三氟甲基,三氟甲氧基,氯代二氟甲氧基,二氟甲氧基,四氟乙氧基,三氟甲基巯基或氯代二氟甲基巯基在m-或p-位上 通过使相应的苯并恶嗪酮(II)(II)特别是5-氯取代或5-溴取代的苯并恶嗪酮(II)与氟化物,特别是氟化钾在溶剂存在或不存在下,通过 反应在没有水或使用预先干燥的原料的情况下进行的方法,并且在存在或不存在分解抑制剂的情况下,干燥优选通过用酰卤处理,例如 亚硫酰氯,并且使用的抑制剂是金属碘化物,例如。 碘化钠或碘。