A process for the preparation of a compound of formula (I)
1
comprising oxidizing a compound of formula (II)
2
with trifluoroperacetic acid in the presence of a corrosion inhibiting compound such as boric acid. Also, a process for preparing a compound of formula (II) by adding sulfur dioxide to a mixture of the corresponding disulfide, a formate salt, trifluoromethyl bromide and a polar solvent; and a process for preparing the disulfide comprising adding S
2
Cl
2
to a solution, in an organic solvent, of the corresponding 4-unsubstituted pyrazole.
一种制备式(I)1化合物的方法,包括在有腐蚀
抑制剂(如
硼酸)的存在下,用
三氟过氧乙酸氧化式(II)2化合物。此外,还提供了一种通过将
二氧化硫加入对应的二
硫化物、
甲酸盐、三
氟甲基
溴和极性溶剂的混合物来制备式(II)化合物的方法;以及一种制备二
硫化物的方法,包括向对应的4-未取代
吡唑的有机溶剂溶液中加入S2Cl2。