Process for Manufacturing 5-Chloromethyl-2,3-Pyridine Dicarboxylic Acid Anhydrides
申请人:Menges Frederik
公开号:US20110224439A1
公开(公告)日:2011-09-15
A process for manufacturing 5-chloromethyl-2,3-pyridine dicarboxylic acid anhydrides (I)
wherein
Z is hydrogen or halogen;
Z
1
is hydrogen, halogen, cyano or nitro;
comprising the steps of
(i) reacting a compound of formula (II),
wherein the symbols have the meaning given in formula (I), with a chlorinating agent, optionally in the presence of a radical initiator in a solvent selected from halogenated hydrocarbons,
and
(ii) crystallizing the compound (I) formed in step (i) from a solvent selected from chlorobenzene, 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, dichloroethane, trichloromethane, dichloromethane, toluene, xylenes, ethyl acetate, methyl tert.-butyl ether, and mixtures thereof.
Compounds (I) are useful intermediates in the synthesis of herbicidal imidazolinones.
一种制造5-氯甲基-2,3-吡啶二羧酸酐(I)的过程,其中Z为氢或卤素;Z1为氢,卤素,氰基或硝基;包括以下步骤:(i)将式(II)的化合物与氯化剂反应,其中符号具有式(I)中给出的含义,可选地在卤代烃溶剂中加入自由基引发剂,以及(ii)从氯苯,1,2-二氯苯,1,3-二氯苯,1,4-二氯苯,二氯乙烷,三氯甲烷,二氯甲烷,甲苯,二甲苯,乙酸乙酯,甲基叔丁基醚和其混合物中选择的溶剂中结晶化步骤(i)中形成的化合物(I)。化合物(I)在杂草除草剂咪唑烷酮的合成中是有用的中间体。