The present invention relates to a new method of preparing halogenated styrene compounds of formula (VIII)
which are precursors in the process of synthesis of substituted isoxazoline compounds of formula (I)
wherein R
1
to R
5
, R
8
and R
9
are described as in the description.
The present invention relates further to the synthesis of compounds of formula (I) starting from acetophenones. The desired styrenes of formula are prepared from the appropriate substituted acetophenone. Asides bromo anilines react with formoxime. Obtained oximes undergo a cycloaddition with the styrenes and give isoxazolines. Compounds of formula (I) can then be prepared in a palladium catalyzed carbonylative amination reaction of the isoxazolines.
本发明涉及一种制备卤代
苯乙烯化合物(式(VIII))的新方法,它们是合成取代
异噁唑化合物(式(I))的前体,在其中R1至R5、R8和R9如说明书所述。本发明还涉及从
苯乙酮开始合成式(I)化合物。所需的式的
苯乙烯从适当的取代
苯乙酮制备而来。除
溴苯胺与甲酰
肟反应外,得到的
肟经过环加成反应与
苯乙烯反应并产生
异噁唑烷。然后,在
异噁唑烷的
钯催化羰基化胺化反应中可以制备式(I)化合物。