# Patent

## Title
Process for the preparation of 5-fluoro-1H-pyrazoles

## Abstract

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, CF2CF2Cl, CFClCF3,

in the presence of water and a base.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a §371 National Stage Application of PCT/EP2013/065094, filed Jul. 17, 2013, which claims priority to EP 12177058.0, filed Jul. 19, 2012.
BACKGROUND
1. Field of the Invention
5-fluoro-1H-pyrazoles, in particular 5-Fluoro-1-methyl-3-pentafluoroethyl-4-trifluoromethyl-1H-pyrazole, are important building blocks for the preparation of crop protection chemicals, as those described in WO 2010051926.
2. Description of Related Art
It is known that 5-fluoro-1-methyl-3-pentafluoroethyl-4-trifluoromethyl-1H-pyrazole can be prepared by the treatment of the dimer of hexafluoropropene with water free N,N-dimethylhydrazine in diethyl ether at −50° C. followed by heating of the intermediate at 120° C., I. L. Knunyants et al. Izv. Akad. Nauk SSSR, (1990) 2583-2589.




However, this two step transformation requires low temperatures for the first step and results in the formation of CH3F during the thermal elimination in the second step, making this process expensive, environmentally unfriendly, and particularly difficult for industrialization
Starting from perfluoro-2-methyl-2-penten and phenylhydrazine, in the presence of triethylamine at −50° C. 1-Phenylpyrazole was prepared in 90% yield (SU 1456419). Furin et al. J. Fluor. Chem. 98(1999) 29 reported that the areaction of perfluoro-2-methyl-2-penten with phenylhydrazine in CH3CN gave a mixture of isomeric pyrazoles 3 and 4 in a ratio 4:1.




The utilization of the commercially available and cheap monoalkylhydrazines (especially in the form of their water solutions) for the regioselective synthesis of the said pyrazoles is not known to the person of ordinary skill in the art.
SUMMARY
The problem to be solved by this invention was to identify a simple and selective process for preparing 5-fluoro-1H-pyrazoles from available fluoroalkenes and mono-substituted hydrazines, which should in particular be amenable for an industrial scale process.
Surprisingly, 5-fluoro-1H-pyrazoles of the general formula (I)




can be prepared in high purity and in a short and simple process by reacting an olefins of the general formula (II)





with a monoalkyl/arylhydrazine of the formula (III)

R1—NH—NH2  (III),

in the presence of water and a base,

wherein

R1 is selected from C1-C6 alkyl, cycloalkyl, C5-C10 aryl;

R2 is a trihalomethyl moiety with at least one fluorine atom; and

R3 is selected from C1-C5 haloalkyl as CF3, CF2Cl, C2F5, C3F7, CF2CF2Cl, CFClCF3 



DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
A preferred embodiment of the present invention relates to a process for preparing pyrazoles of formula (Ia),




wherein R1 is selected from C1-C6 alkyl, and which comprises the reaction of perfluoro-2-methyl-2-pentene





with a monoalkylhydrazine of the general formula (III).

R1—NH—NH2  (III)

A most preferred embodiment of the present invention relates to a process for preparing pyrazoles of formula (Ib),




Perfluoro-2-methyl-2-pentene is commercially available (Fa Daikin) and P&M Invest (Russia) or can be prepared via dimerization of hexafluoropropene, see U.S. Pat. No. 5,254,774; R. Haszeldiner et al, Journal of the Chemical Society [Section] D: Chemical Communications (1970), (21), 1444-5.
Monoalkylhydrazines and Monoarylhydrazines are commercially available chemicals.
Preferably R1 is selected from alkyl, very preferably it is methyl.
Preferably R2 is selected from CF3, CF2Cl, very preferably it is CF3.
Preferably R3 is CF3, C2F5, C3F7, CF2CF2Cl, CFClCF3, very preferably it is, C2F5.
Most preferable are R1=Me, R2=CF3, R3=C2F5.
Surprisingly, is has been found that the interaction of fluoroalkenes of the formula (II) with water and a base followed by a reaction with hydrazine of the formula (III) proceeds regioselectively with the formation of only one isomeric pyrazole of the formula (I) in a high yield.




The reaction is performed in the presence of water. According to a further preferred embodiment of the present invention, the amount of water used in the reaction is between 1 and 15 equivalents, preferably 1.5 and 7 equivalents, more preferably 1 and 5 equivalents per one equivalent of the compound of formula (II).
The reaction can be performed in the presence of organic and inorganic bases. Preferred organic bases are: triethylamine, tripropylamine, tributylamin, methydiisopropylamin, N-methylmorpholine, pyridine, alkylpyridines.
Preferred inorganic bases to carry out the reaction are: NaHCO3, K2CO3, NaOH, NaHCO3, KF
The amount of base is selected between 1 and 7 equivalents, preferably between 1.5 and 5 equivalents, more preferably between 1.5 and 3.5 equivalents per one equivalent of the compound of formula (II).
The cyclisation is performed in different solvents selected from alkanes like hexanes, cyclohexane, methylcyclohexane, haloalkanes preferably dichlorometane, dichlorethane, alcohols, preferably methanol, ethanol, or isopropanol, nitriles, preferably acetonitrile, or butyronitrile, amides, preferably dimethylformamide, or dimethylacetamide, ethers like diethylether, methyltert.butylether, dimethoxyethane, diglym, benzene, toluene, dichlorobenzene, chlorobenzene.
Particularly preferred solvents for the cyclisation are dichloromethane, dichloroethane, acetonitrile and butyronitrile, most preferred solvents for this reaction are dichloromethane, acetonitrile and butyronitrile
According to a further embodiment of the present invention, the cyclization is performed at a temperature ranging from −5° C. to 50° C., more preferably at a temperature ranging from 0° C. to 30° C., most preferably from 0° C. to room temperature.
Generally, the reaction time is not of critical importance and can depend on the reaction volume, preferably it is within the range of 3 and 20 h. more preferably within the range of 1 and 5 h.
The ratio of the compound of formula (III) and the compound of formula (II) can vary within a large range, preferably it is within 0.9 and 1.5 equivalents, more preferably between 1 to 2.5 equivalents, even more preferably between 1 to 1.5, and most preferably 1 equivalent of (III) per one equivalent of the compound of formula (II).
Example 1
N-Methyl-3-Pentafluoroethyl-4-Trifluoromethyl-5-Fluoro-1H-Pyrazole
In a 3-kneck flask equipped with condenser, thermometer, and a dropping funnel 130 ml methylene chloride and perfluoro-2-methyl-2-pentene (19.6 g, 0.065 mol) was placed and then 15 ml water were added. The mixture was cooled to 0° C. and Et3N (16.4 g, 0.16 mol) was added at a temperature ranging from 0° C. to 5° C. The mixture was stirred at this temperature for 15 min and 40% solution of methylhydrazine in water (7.4 g) was slowly added to this mixture at 0° C. The reaction mixture was stirred for 1 h at 5° C. and finally for 1.5 h at 20° C. The mixture was washed with water (3×50 ml), the organic layer was dried over Na2SO4 and the solvent was distilled off under atmospheric pressure. The crude product was purified via vacuum distillation. The yield of N-methyl-3-pentafluoroethyl-4-trifluoromethyl-5-fluoro-1H-pyrazole was 13.9 g. (75%), boiling point 62-65° C. at 17 mbar.
19F NMR δ: 53.7 (3F), 83.9 (3F), 112.1 (2F), 125.1 (1F) ppm.
Example 2
N-Methyl-3-Pentafluoroethyl-4-Trifluoromethyl-5-Fluoro-1H-Pyrazole
In a 21 3-kneck flask equipped with condenser, thermometer, and a dropping funnel 1300 ml methylene chloride and perfluoro-2-methyl-2-pentene (197 g, 0.65 mol) was placed, and then 117 ml water were added. The mixture was cooled to −0° C. and Et3N (164 g, 1.62 mol) was added at a temperature ranging from −5° to 5° C. The mixture was stirred at this temperature for 15 min and a solution of 75 ml N-methylhydrazine in water (40% w.w.) was slowly added to this mixture at 5° C. within 2 h. The reaction mixture was stirred for 15-20 h at 20° C. The mixture was washed with water, the organic layer was dried over Na2SO4 and the solvent was distilled off under atmospheric pressure. The crude product was purified via vacuum distillation. The yield of N-Methyl-3-pentafluoroethyl-4-trifluoromethyl-5-fluoro-1H-pyrazole was 158 g (85% yield). Boiling point 62-67° C. at 15-20 mbar.
19F NMR δ: 53.7 (3F), 83.9 (3F), 112.1 (2F), 125.1 (1F) ppm.
Example 3
Similarly prepared N-Ethyl-3-pentafluoroethyl-4-trifluoromethyl-5-fluoro-1H-pyrazole from perfluoro-2-methyl-2-pentene and N-Ethylhydrazine
Yield 83%, boiling point 70° C. at 18-20 mbar.

## Claims

1. A process for synthesis of 5-fluoro-1H-pyrazole of formula (I)



comprising reacting an olefin of formula (II)




with a hydrazine of formula (III)


R1—NH—NH2  (III),


wherein
R1 is selected from C1-C6 alkyl;
R2 is a trihalomethyl moiety with at least one fluorine atom; and
R3 is selected from C1-C5 haloalkyl,
in the presence of water and a base.

2. A process according to claim 1, wherein
R1 is methyl,
R2 is CF3, and
R3 is C2F5.

3. A process according to claim 1, wherein the base is triethylamine.

4. A process according to claim 1, wherein
R2 is CF3 and
R3 is C2F5.