7-(4,6-Dimethoxypyrimidinyl)oxy- and -thiophthalides as novel herbicides: Part 1. CGA 279 233: a new grass-killer for rice
作者:Christoph Lüthy、Helmut Zondler、Thomas Rapold、Gottfried Seifert、Bernhard Urwyler、Thomas Heinis、Hans Christian Steinrücken、James Allen
DOI:10.1002/ps.304
日期:2001.3
A series of novel types of 7-(4,6-dimethoxypyrimidin-2-yl)oxy- and -thio-3-methyl-1 (3H)-isobenzofuranones were discovered at Dr R Maag AG. From the thio-isobenzofuranyl series, CGA279 233--BSI-proposed common name pyriftalid--was chosen for further development as a grass herbicide for use in rice. General synthetic approaches to these new phthalic acid-derived compounds are given, with emphasis on
R R Maag AG博士发现了一系列新型的7-(4,6-二甲氧基嘧啶-2-基)氧基-和-硫代-3-甲基-1(3H)-异苯并呋喃酮。从硫代-异苯并呋喃基系列中,选择CGA 279 233(BSI提出的通用名称pyrpidalid)作为水稻中的除草剂进行进一步开发。给出了这些新的邻苯二甲酸衍生化合物的一般合成方法,重点是吡苯哌啶的合成及其理化行为。
Method for the preparation of 2-amino-6-ethylbenzoic acid
申请人:Active Biotech AB
公开号:EP2316818A1
公开(公告)日:2011-05-04
The present invention relates to a novel method for the production of 2-amino-6-ethylbenzoic acid wherein 7-amino-3-methylphtalide or 7-amino-3-hydroxy-3-methylphtalide is reduced to 2-amino-6-ethylbenzoic acid in water or in a mixture of a water miscible solvent and water at a pH of 7 or higher using a hydrogenation catalyst selected from Raney nickel and palladium based catalysts and using a hydrogen source selected from the group consisting of hydrogen gas, formic acid derivatives and cyclohexen. The invention also relates to 2-amino-6-ethylbenzoic acid produced with this method, and to use of such 2-amino-6-ethylbenzoic acid in the production of paquini-mod.
[EN] METHOD FOR THE PREPARATION OF 2-AMINO-6-ETHYLBENZOIC ACID<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ACIDE 2-AMINO-6-ÉTHYLBENZOÏQUE
申请人:ACTIVE BIOTECH AB
公开号:WO2011054874A1
公开(公告)日:2011-05-12
The present invention relates to a novel method for the production of 2- amino-6-ethylbenzoic acid wherein7-amino-3-methylphtalide or 7-amino-3- hydroxy-3-methylphtalide is reduced to 2-amino-6-ethylbenzoic acid in water or in a mixture of a water miscible solvent and water at a pH of 7 or higher using a hydrogenation catalyst selected from Raney nickel and palladium based catalysts and using a hydrogen source selected from the group consisting of hydrogen gas, formic acid derivatives and cyclohexen. The invention also relates to 2-amino-6-ethylbenzoic acid produced with this method, and to use of such 2-amino-6-ethylbenzoic acid in the production of paquinimod.
A process for the preparation of aniline compounds of formula
1
wherein
n and R are as defined in claim 1, by reacting nitro compounds of formula
2
wherein n and R are as defined, with hydrazine at elevated temperature in the presence of an aqueous base.
The compounds of formula I are suitable as intermediates in the preparation of herbicides of the isobenzofuranone type.