Process for the preparation of substituted chloroacetanilides
    6.
    发明授权
    Process for the preparation of substituted chloroacetanilides 失效
    制备取代氯乙酰苯胺的方法

    公开(公告)号:US4511736A

    公开(公告)日:1985-04-16

    申请号:US456383

    申请日:1983-01-07

    CPC分类号: C07C231/02 A01N37/22

    摘要: The invention relates to a novel process for preparing chloroacetanilides of the formula ##STR1## wherein: R.sub.1 and R.sub.2 represent independently from each other a hydrogen atom or a C.sub.1-8 alkyl or C.sub.1-8 alkoxy group; andR.sub.3 stands for a straight chained or branched C.sub.1-8 alkoxy group.Said process is characterized by chloroacetylating a 2,6-dialkylaniline of the formula ##STR2## wherein R.sub.1 and R.sub.2 are as defined above, at a temperature of 10.degree. to 120.degree. C., optionally in a solvent medium in the presence of an acid binding agent, then reacting a thus-obtained intermediate with chloromethyl chloroformiate or, alternatively, reacting a compound of the formula (II) first with chloromethyl chloroformiate and subjecting then to chloroacetylation, thereafter reacting a thus-obtained intermediate with an alcohol of the formulaR.sub.3 --OH (III),wherein R.sub.3 is as defined above, optionally in a solvent medium in the presence of an acid binding agent, and recovering a product of the formula (I) in a known manner.The process of the invention enables the more simple and economic preparation of the compounds of formula (I) of improved purity.

    摘要翻译: 本发明涉及一种制备式(I)的氯乙酰苯胺的新方法,其中:R1和R2彼此独立地表示氢原子或C1-8烷基或C1-8烷氧基; R3代表直链或支链C 1-8烷氧基。 所述方法的特征在于在10℃至120℃的温度下,任选在存在的溶剂介质中氯代乙酰化式(II)的2,6-二烷基苯胺,其中R 1和R 2如上定义 然后使由此获得的中间体与氯甲基氯甲酸酯反应,或者使式(II)的化合物首先与氯甲酸氯甲酯反应,然后进行氯乙酰化,然后使由此得到的中间体与醇的醇反应 任选地在酸性结合剂存在下在溶剂介质中,以已知方式回收式(I)的产物,其中R3如上所定义的式R3-OH(III)。 本发明的方法使得可以更简单和经济地制备具有改进纯度的式(I)化合物。