申请人:Bayer Aktiengesellschaft
公开号:US05182401A1
公开(公告)日:1993-01-26
A process for the preparation of a 3-amino-2-(het)aroyl-acrylic acid derivative fo the formula ##STR1## in which Y represents a nitrile, or an ester group, --COOR.sub.1, or an acetyl group, where R.sup.1 denotes C.sub.1 -C.sub.4 -alkyl, and R denotes optionally substituted alkyl, cyclopropyl, alkoxy, phenyl or amino, A represents nitrogen or C--R.sub.2, where R.sub.2 denotes hydrogen, methyl, halogen, nitro, methoxy or cyano, X.sub.1 and X.sub.2 are identical or different and denote halogen, and X.sub.3 denotes hydrogen, halogen or nitro and X.sub.4 denotes halogen, nitro, methoxy or methylthio, which comprises reacting a 3-dialkylamino-2-(het)aroyl-acrylic acid derivative of the formula ##STR2## in which R.sub.3 and R.sub.4 are the same or different and represent an alkyl group having 1 to 4 carbon atoms, or, together with the nitrogen atom to which they are bonded, form a ring, with a primary amine of the formula R--NH.sub.2 in the presence of at least one equivalent of an acid HX in a solvent or in excess acid.
制备式为##STR1##的3-氨基-2-(het)aroyl-丙烯酸衍生物的方法,其中Y表示腈基或酯基,-COOR.sub.1或乙酰基,其中R.sup.1表示C.sub.1-C.sub.4-烷基,R表示可选择性取代的烷基、环丙基、烷氧基、苯基或氨基,A表示氮或C--R.sub.2,其中R.sub.2表示氢、甲基、卤素、硝基、甲氧基或氰基,X.sub.1和X.sub.2相同或不同,表示卤素,X.sub.3表示氢、卤素或硝基,X.sub.4表示卤素、硝基、甲氧基或甲硫基,包括在溶剂或过量酸中,在至少一个当量的酸HX存在下,将式为##STR2##的3-二烷基氨基-2-(het)aroyl-丙烯酸衍生物与式为R--NH.sub.2的一级胺反应。