[EN] PREPARATION OF HALOGEN ANALOGS OF PICLORAM<br/>[FR] PRÉPARATION D'ANALOGUES HALOGÉNÉS DE PICLORAM
申请人:DOW AGROSCIENCES LLC
公开号:WO2020061146A1
公开(公告)日:2020-03-26
Methods for preparing 5-fluoro-6-(bromo or chloro)picloram analogs, or derivatives thereof, from picloram acid, picloram ester, or the nitrile analog of picloram are provided. The methods include chemical process steps that: (1) introduce a phthaloyl group onto the 4-amino substituent of picloram acid, picloram ester, or the nitrile analog of picloram, (2) add 2 fluorine atoms at the 5,6-positions of the pyridine ring using halex fluorination chemistry, (3) remove the phthaloyl group, hydrolyze the ester or nitrile substituent, and add chlorine or bromine to the 6-position by treatment with an acid and water, and finally, (4) esterify the 5-fluoro-6-(bromo or chloro)picloram acid produced in step (3) to a 5-fluoro-6-(bromo or chloro)picloram ester.
提供了从
吡克洛拉姆酸、
吡克洛拉姆酯或
吡克洛拉姆的腈类似物制备5-
氟-6-(
溴或
氯)
吡克洛拉姆类似物或衍
生物的方法。这些方法包括
化学过程步骤:(1)将
邻苯二甲酰基引入
吡克洛拉姆酸、
吡克洛拉姆酯或
吡克洛拉姆的腈类似物的4-
氨基取代物上,(2)使用哈莱克斯
氟化
化学在
吡啶环的5,6-位置添加2个
氟原子,(3)去除
邻苯二甲酰基,
水解酯或腈基取代物,并通过酸和
水处理在6-位置添加
氯或
溴,最后,(4)将步骤(3)中产生的5-
氟-6-(
溴或
氯)
吡克洛拉姆酸酯化为5-
氟-6-(
溴或
氯)
吡克洛拉姆酯。