摘要:
The present invention relates to a process for preparing difluoromethyl-substituted pyrazol-4-yl carboxylates of the formula (I) in which R1 is C1-C8-alkyl, C3-C8-cycloalkyl, C1-C4-alkoxy-C1-C4-alkyl, etc.; and R2 is hydrogen, C1-C4-alkyl, benzyl or phenyl, wherein a) a compound of the general formula (II) in which X is fluorine, chlorine, or bromine, R1 has one of the definitions given above, and R4 is C1-C8-alkyl, C3-C8-cycloalkyl, C2-C8-alkenyl, benzyl or phenyl, is reacted with a silane compound of the general formula R3nSiCl(4-n) in which n is 1, 2 or 3 and the substituents R3 are each independently selected from C1-C8-alkyl and phenyl, and with a metal which is selected from the metals of groups 1, 2, 3, 4 and 12 of the periodic table and has a redox potential of less than -0.7 V, based on a standard hydrogen electrode (at 25°C and 101.325 kPa); and b) the reaction mixture from step a) is reacted with a compound of the general formula (III) in which R2 has one of the definitions given above.
摘要:
The present invention relates to a process for the sulfinylation of a pyrazole derivative, characterized in that 5-amino-1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-1H-pyrazole-3-carbonitrile (II) is reacted with a sulfinylating agent S in the presence of at least one amine acid complex wherein the amine(s) are selected from secondary and/or tertiary amines and the acid(s) are selected from hydrofluoric, hydrochloric, hydrobromic and hydroiodic acid and sulfonic acid derivatives, and with the addition of a halogenating agent, wherein S is [CF3S(O)]2O; or CF3S(O)X wherein X means fluoro, chloro, bromo, iodo, a hydroxy group, or an alkaline or alkaline earth metal salt of the hydroxy group; or mixtures thereof, wherein the temperature of the reaction mixture at no time exceeds 39°C.
摘要:
The present invention relates to a process for the sulfinylation of a pyrazole derivative, characterized in that 5-amino-1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-1H-pyrazole-3-carbonitrile (II) is reacted with a sulfinylating agent S in the presence of at least one amine acid complex wherein the amine(s) are selected from cyclic secondary amines and the acid(s) are selected from sulfonic acid derivatives, and with the addition of a halogenating agent, wherein S is [CF3S(O)]2O; or CF3S(O)X wherein X means fluoro, chloro, bromo, iodo, a hydroxy group, or an alkaline or alkaline earth metal salt of the hydroxy group; or mixtures thereof.
摘要:
The present invention refers to a process for the preparation of pyrazole derivatives of formula (I), wherein W is nitrogen or CR 1 , R 1 , R 2 , R 4 and R 5 are each independently selected from hydrogen, halogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, R 7 S(O)n, nitro, cyano, and pentafluorothio; R 3 is hydrogen, halogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6- haloalkoxy, R 7 S(O)n, nitro, cyano, pentafluorothio or phenyl which is unsubstituted or substituted by 1 to 5 members of the group consisting of halogen, C 1 -C 6 -alkyl, C 1 -C 6- haloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6- haloalkoxy, R 7 S(O)n, nitro, cyano, and pentafluorothio which are the same or different; R 7 is C 1 -C 6 -alkyl or C 1 -C 6 -haloalkyl; and n is 0, 1, or 2; characterized in that hydrazines of formula (II) wherein W, R 2 , R 3 , R 4 , and R 5 are as defined for pyrazole derivatives of formula (I), are reacted with a compound of formula (III).
摘要:
The invention relates to a method for purifying trifluoromethanesulfinic acid by azeotropic distillation using an aromatic solvent, to a method for producing purified trifluoromethanesulfinic acid, and to the use of the purified trifluoromethanesulfinic acid for the production of trifluoromethylsulfinylated pyrazole derivatives, in particular fipronil.
摘要:
The present invention relates to a method for preparing 1,3-substituted pyrazol compounds of formula (I), where X stands for a group CX 1 X 2 X 3 , with X 1 , X 2 and X 3 being hydrogen, fluorine or chlorine, independently of one another, R 1 being an C 1 -C 4 alkyl or cyclopropyl, and R 2 being hydrogen, CN or a group CO 2 R 2a , where R 2a stands for C 1 -C 6 alkyl in particular, comprising the following steps: i) reacting a compound of formula II with a hydrazone of formula (III), wherein in formula (II) the variables X and R 2 have the same meaning as indicated for formula (I), Y stands for oxygen, a group NR y1 or a group [NR y2 R y3 ] + Z - , R 3 stands for OR 3a or a group NR 3b R 3c , and wherein in formula (III) the variable R 1 has the same meaning as indicated for formula (I), R 4 and R 5 stand for hydrogen, C 1 -C 6 alkyl, alternatively substituted phenyl, independent of one another, wherein at least one of the radicals R 4 or R 5 is different from hydrogen and where R 4 and R 5 can also stand for a 5 to 10-membered saturated carbocycle together with the carbon atom connected thereto; treatment of the reaction product obtained thereby with an acid in the presence of water.