METHOD FOR PREPARING HALOGENATED 3-OXOCARBOXYLATES CARRYING A 2-ALKOXYMETHYLIDENE OR A 2-DIALKYLAMINOMETHYLIDENE GROUP
申请人:BASF SE
公开号:EP3178813A1
公开(公告)日:2017-06-14
The present invention relates to a process for preparing compounds of the formula I,
wherein
R1 and R2
are each independently from one another selected from hydrogen, fluorine, bromine, chlorine and trifluoromethyl,
R3
is selected from fluorine chlorine and trifluoromethyl,
R4
is selected from C1-C4-alkyl, and
X
is either -OR5 or -NR6R7, wherein R5 is selected from C1-C4-alkyl, and R6 and
R7
are each independently from one another selected from C1-C4-alkyl,
which comprises the reaction of a compound of the formula II
with a reagent of the formula III,
wherein the variables R1, R2, R3, R4, R5 and X given in formulae II and III have the above defined meanings,
in the presence of a catalyst selected from Brønsted acids, ammonium salts of Brønsted acids and Lewis acids;
wherein the reaction is performed essentially in the absence of a carboxylic acid anhydride.
本发明涉及一种制备式 I 化合物的工艺、
其中
R1 和 R2
各自独立地选自氢、氟、溴、氯和三氟甲基、
R3
选自氟、氯和三氟甲基、
R4
选自 C1-C4- 烷基,以及
X
是-OR5 或-NR6R7,其中 R5 选自 C1-C4-烷基,R6 和
R7
各自独立地选自 C1-C4-烷基、
其中 R5 选自 C1-C4-烷基,R6 和 R7 各自独立地选自 C1-C4-烷基。
与式 III 的试剂反应、
式 II 和式 III 中的变量 R1、R2、R3、R4、R5 和 X 具有上述定义的含义、
在选自布伦斯特酸、布伦斯特酸的铵盐和路易斯酸的催化剂存在下;
其中,反应基本上在没有羧酸酐的情况下进行。