A new process for the preparation of 5-fluoro-1H-pyrazoles of the general formula (I), is described, resulting from the reaction of an olefin of the general formula (II) with hydrazines of the formula (III) R1-NH-NH2 (III), wherein R1 is selected from C1-C6 alkyl, C5-C10 aryl; R2 is a trihalomethyl moiety with at least one fluorine atom; and R3 is selected from C1-C5 haloalkyl, CF3, C2F5, C3F7, CF2CF2CI, CFCICF3, in the presence of water and a base.
本文介绍了一种制备通式为(I)的5-
氟-1H-
吡唑的新工艺,该工艺是通过通式为(II)的烯烃与通式为(III)的
肼反应得到的,其中通式(III)中的R1选自C1-C6烷基,C5-C10芳基;R2是至少含有一个
氟原子的三卤甲基基团;R3选自C1-C5卤代烷基,
CF3,
C2F5,
C3F7,
CF2CF2CI,CFCI ,在
水和碱的存在下进行反应。