[EN] METHODS OF ISOLATING (4-CHLORO-2-FLUORO-3-SUBSTITUTED-PHENYL) BORONATES AND METHODS OF USING THE SAME<br/>[FR] PROCÉDÉS D'ISOLEMENT DE PHÉNYLBORONATES 4-CHLORO-2-FLUORO-3 SUBSTITUÉS ET LEURS PROCÉDÉS D'UTILISATION
申请人:DOW AGROSCIENCES LLC
公开号:WO2013101987A1
公开(公告)日:2013-07-04
Methods of isolating a 4-chloro-2-fluoro-3-substituted-phenylboronate include adding carbon dioxide gas or carbon dioxide solid (dry ice) to a solution comprising a 4-chloro-2-fluoro-3-substituted-phenylboronate, an inert organic solvent, and at least one lithium salt to react the at least one lithium salt with the carbon dioxide gas or carbon dioxide solid (dry ice) and form a mixture comprising the 4-chloro-2-fluoro-3- substituted-phenylboronate, the inert organic solvent, and a precipitated solid. The precipitated solid may be removed from the mixture. Methods of using 4-chloro-2- fluoro-3-substituted-phenylboronates to produce methyl-4-amino-3-chloro-6-(4-chloro- 2-fluoro-3-substituted-phenyl)pyridine-2-carboxylates are also disclosed. A 4-chloro-2-fluoro-3-substituted-phenylboronate produced by one of the methods of isolating a 4-chloro-2-fluoro-3-substituted-phenylboronate is also disclosed, wherein the 4-chloro-2-fluoro-3-substituted-phenylboronate may be obtained at a yield of greater than or equal to about 90%.
分离4-氯-2-氟-3-取代苯基硼酸酯的方法包括向包含4-氯-2-氟-3-取代苯基硼酸酯、惰性有机溶剂和至少一种锂盐的溶液中加入二氧化碳气体或二氧化碳固体(干冰),以使至少一种锂盐与二氧化碳气体或二氧化碳固体(干冰)反应并形成包含4-氯-2-氟-3-取代苯基硼酸酯、惰性有机溶剂和沉淀固体的混合物。可以从混合物中去除沉淀固体。还公开了使用4-氯-2-氟-3-取代苯基硼酸酯制备甲基-4-氨基-3-氯-6-(4-氯-2-氟-3-取代苯基)吡啶-2-羧酸甲酯的方法。还公开了一种由分离4-氯-2-氟-3-取代苯基硼酸酯的方法之一生产的4-氯-2-氟-3-取代苯基硼酸酯,其中4-氯-2-氟-3-取代苯基硼酸酯的收率可以达到大约90%或更高。