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    • 3. 发明授权
    • Process for the preparation of 4,6-dimethoxy-2-(methylsulfonyl)-1,3-pyrimidine
    • 制备4,6-二甲氧基-2-(甲基磺酰基)-1,3-嘧啶的方法
    • US06693194B2
    • 2004-02-17
    • US10332248
    • 2003-01-06
    • Beat JauBernhard Urwyler
    • Beat JauBernhard Urwyler
    • C07D23960
    • C07D405/12C07D239/60
    • Process for preparing 4,6-dimethoxy-2-(methylsulfonyl)-1,3-pyrimidine by reacting 4,6dichloro-2-(methyltio)-1,3-pyrimidine in an inert organic solvent with an alkali metal methoxide, transfer of the resulting 4,6-dimethoxy-2-(methylthio)-1,3-pyrimidine into an aqueous-acidic medium and subsequent oxidation of this compound, of appropriate in the presence of a catalyst, wherein the oxidation is followed by a purification step in which the aqueous-acidic reaction mixture is adjusted with aqueous base to a pH in the range of 5-8 and stirred either in the presence or in the absence of an organic solvent, and the use of this compound for preparing herbicides, for example 7-[(4,6-dimethoxy-pyrimidin-2-yl)thio]-3-methylphthalide.
    • 通过使四氯-2-(甲基氧基)-1,3-嘧啶在惰性有机溶剂中与碱金属甲醇盐反应制备4,6-二甲氧基-2-(甲基磺酰基)-1,3-嘧啶的方法,将 将所得的4,6-二甲氧基-2-(甲硫基)-1,3-嘧啶转化为酸性介质,随后在催化剂存在下氧化该化合物,其中氧化后进行纯化步骤 其中将水性 - 酸性反应混合物用碱水溶液调节至pH为5-8,并在有机溶剂存在或不存在下搅拌,并使用该化合物制备除草剂,例如 7 - [(4,6-二甲氧基 - 嘧啶-2-基)硫基] -3-甲基苯酞。