申请人:Oce-Andeno B.V.
公开号:US04262129A1
公开(公告)日:1981-04-14
Preparation of a 3-thienylmalonic acid or a diester thereof comprising reacting in a polar solvent in the presence of a copper (I) halide a thiophene compound of formula: ##STR1## wherein X=I or Br, R.sub.1 =H or a C.sub.1-4 alkyl group, R.sub.2 =H or a C.sub.1-2 alkyl group and R.sub.3 =H or a C.sub.1-2 alkyl group, with the proviso that R.sub.2 and R.sub.3 cannot be an alkyl group simultaneously, with a mono-deprotonated methylene compound of formula: ##STR2## wherein a cation is present and Z'=Z" is CN or COOR in which R is a C.sub.1-4 alkyl group, or Z'=CN and Z"=COOR' in which R' is a C.sub.1-2 alkyl group, followed by hydrolysis by methods known per se to get the corresponding free acid.
在极性溶剂中,在铜(I)卤化物的存在下,反应具有以下公式的噻吩化合物制备3-噻吩丙二酸或其二酯:其中X=I或Br,R.sub.1=H或C.sub.1-4烷基,R.sub.2=H或C.sub.1-2烷基,R.sub.3=H或C.sub.1-2烷基,但R.sub.2和R.sub.3不能同时是烷基,与具有以下公式的单去质子亚甲基化合物反应:其中存在阳离子且Z'=Z"为CN或COOR,其中R为C.sub.1-4烷基,或Z'=CN且Z"=COOR',其中R'为C.sub.1-2烷基,随后通过已知方法水解以获得相应的游离酸。