[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。