A 2-acylamino-5-halogenated-cinnamic acid derivative represented by the formula (III) which is useful as an intermediate for producing medicines and agricultural chemicals:
wherein Ac represents a lower acyl group, R represents a hydrogen atom or a lower alkyl group, and X₁ represents a halogen atom. This derivative is obtained by reacting a compound represented by the formula (I),
wherein Ac and X₁ are as defined above, and X₂ represents a bromine or iodine atom,
with acrylic acid or its ester represented by the formula (II),
CH₂=CHCOOR (II)
where R is as defined above,
in the presence of a palladium catalyst, a tri(unsubstituted- or substituted-phenyl)phosphine and an acid-binding agent.
一种由式 (III) 表示的 2-酰
氨基-5-卤代
肉桂酸衍
生物,可用作生产药物和农用
化学品的中间体:
其中 Ac 代表低级酰基,R 代表氢原子或低级烷基,X₁ 代表卤素原子。这种衍
生物是由式 (I) 所代表的化合物反应得到的、
其中 Ac 和 X₁ 如上定义,X₂ 代表
溴原子或
碘原子、
与式 (II) 所代表的
丙烯酸或其酯、
CH₂=CHCOOR (II)
其中 R 如上定义、
在
钯催化剂、三(未取代或取代苯基)膦和酸结合剂的存在下。