申请人:——
公开号:US20030135047A1
公开(公告)日:2003-07-17
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.
制备 4,6-二甲氧基-2-(甲磺酰基)-1,3-嘧啶的工艺:在惰性有机溶剂中使 4,6-二氯-2-(甲硫基)-1,3-嘧啶与碱金属甲氧基反应,将生成的 4,6-二甲氧基-2-(甲硫基)-1,3-嘧啶转移到酸性水介质中,然后氧化该化合物、在有催化剂存在或无有机溶剂存在的情况下,将水酸性反应混合物用水碱调节至 pH 值在 5-8 范围内并搅拌,然后将该化合物用于制备除草剂,例如 7-&lsqb.4-(4,6-二甲氧基-2-(甲硫基)-1,3-嘧啶);(4,6-二甲氧基嘧啶-2-基)硫]-3-甲基酞。