申请人:Maywald Volker
公开号:US20100056820A1
公开(公告)日:2010-03-04
The present invention relates to a process for preparing substituted 2-arylmalonic esters of the general formula I
in which R is C
1
-C
6
-alkyl or C
1
-C
4
-alkoxy-C
1
-C
4
-alkyl; Ar is phenyl or a heteroaromatic 5- or 6-membered ring; where each carbon atom present in the radicals mentioned above optionally carries a substituent R
A
; R
A
is F, Cl, CN, NO
2
, C
1
-C
4
-alkyl, C
1
-C
4
-haloalkyl, C
1
-C
4
-alkoxy, C
1
-C
4
-haloalkoxy, etc., or two adjacent substituents R
A
together with the carbon atoms to which they are attached form a ring; and where a malonic ester is reacted with a base and an aryl bromide in the presence of a copper salt, which comprises employing from 0.1 to 0.65 molar equivalents of the base per molar equivalent of the malonic ester.
本发明涉及一种制备通式I的取代2-芳基丙二酸酯的方法,其中R为C1-C6-烷基或C1-C4-烷氧基-C1-C4-烷基;Ar为苯基或杂芳5-或6-成员环;上述基团中每个碳原子可选择携带取代基RA;RA为F、Cl、CN、NO2、C1-C4-烷基、C1-C4-卤代烷基、C1-C4-烷氧基、C1-C4-卤代烷氧基等,或者两个相邻的取代基RA与它们连接的碳原子一起形成一个环;以及将丙二酸酯与碱和芳基溴在铜盐存在下反应,其中每摩尔丙二酸酯的摩尔当量中使用0.1至0.65摩尔当量的碱。