PYRIDINE-BASED COMPOUND INCLUDING ISOXAZOLINE RING AND USE THEREOF AS HERBICIDE
申请人:MOGHU RESEARCH CENTER LTD.
公开号:US20190159450A1
公开(公告)日:2019-05-30
A pyridine-based compound containing an isoxazoline ring represented by Formula 1 or an agrochemically acceptable salt thereof can be used as a herbicide. A method of preparing the pyridine-based compound containing an isoxazoline ring represented by Formula 1 includes reacting a compound represented by Formula 2 with a compound represented by Formula 3.
[EN] IMPROVED SYNTHESIS OF 6-ARYL-4-AMINOPICOLINATES<br/>[FR] SYNTHÈSE AMÉLIORÉE DE 6-ARYL-4-AMINOPICOLINATES
申请人:CORTEVA AGRISCIENCE LLC
公开号:WO2021188654A1
公开(公告)日:2021-09-23
The present disclosure relates to improved methods of synthesizing 6-aryl-4-aminopicolinates, such as arylalkyl and alkyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylates.
[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.