The present invention provides a safer and more efficient process for producing [2-(arylsulfonyl)ethenyl]benzene derivatives of the formula (3):
wherein R1, R2, R3 and R4 are the same or different and each independently represent a hydrogen, fluorine, or chlorine atom, a lower alkyl group, or the like, and two adjacent R3 and R4 may bond each other at their terminals to form a ring, which the process is characterized in that a 2-(arylsulfonyl)ethanol of formula (1):
wherein R1 and R2 are as defined above, and an acid anhydride are reacted in the presence of a base, and the reaction liquid obtained is supplied to a reaction with an aromatic halide of formula (2):
wherein X represents a chlorine, bromine, or iodine atom, and R3 and R4 are the same as defined above, in the presence of a palladium catalyst and a base.
本发明提供了一种更安全、更高效的生产式为(3)的[2-(芳基磺酰基)
乙烯基]苯衍
生物的方法:其中R1、R2、R3和R4相同或不同,且各自独立地表示氢、
氟或
氯原子、低碳基或类似物,其中相邻的R3和R4可以在它们的端部结合形成一个环。该方法的特点在于,在碱的存在下,将式为(1)的2-(芳基磺酰基)
乙醇与酸酐反应,然后将得到的反应液供应到式为(2)的芳香卤化物的反应中:其中X表示
氯、
溴或
碘原子,R3和R4与上述定义相同,在
钯催化剂和碱的存在下进行反应。