[EN] SYNTHESIS OF 6-ARYL-4-AMINOPICOLINATES AND 2-ARYL-6-AMINOPYRIMIDINE-4-CARBOXYLATES BY DIRECT SUZUKI COUPLING<br/>[FR] SYNTHÈSE DE 6-ARYL-4-AMINOPICOLINATES ET DE 2-ARYL-6-AMINOPYRIMIDINE-4-CARBOXYLATES PAR COUPLAGE DIRECT DE SUZUKI
申请人:DOW AGROSCIENCES LLC
公开号:WO2017201377A1
公开(公告)日:2017-11-23
Improved methods of synthesizing 6-aryl-4-aminopicolinates, such as arylalky and alkyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylates and arylalkyl and alkyl 4-amino-3-chloro-5-fluoro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2- carboxylates, are described herein. The improved methods include a direct Suzuki coupling step, which eliminates the protection/de-protection steps in the current chemical process, and therefore eliminates or reduces various raw materials, equipment and cycle time as well as modification of other process conditions including use of crude AP, use of ABA-diMe, and varying pH, catalyst concentration, solvent composition, and/or workup procedures. This invention was expanded to include synthesis of 2-aryl-6-aminopyrimidine-4-carboxylates.
本文介绍了合成6-芳基-4-氨基吡啶酸盐的改进方法,例如芳基烷基和烷基4-氨基-3-氯-6-(4-氯-2-氟-3-甲氧基苯基)吡啶-2-羧酸酯和芳基烷基和烷基4-氨基-3-氯-5-氟-6-(4-氯-2-氟-3-甲氧基苯基)吡啶-2-羧酸酯。改进的方法包括直接的Suzuki偶联步骤,消除了当前化学过程中的保护/脱保护步骤,因此消除或减少了各种原材料、设备和周期时间,以及改变其他工艺条件,包括使用粗AP、使用ABA-diMe、改变pH、催化剂浓度、溶剂组成和/或工作程序。本发明还扩展到包括合成2-芳基-6-氨基嘧啶-4-羧酸盐。