Pyrazole derivatives and process for preparing the same

BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
This invention relates to novel pyrazole derivatives and, more particularly, this invention relates to novel pyrazole derivatives represented by the formula ##SPC2##
Wherein R represents an alkyl group, X represents a mono- or di-substituted phenyl group wherein the substituents may be the same or different and each represents an alkyl group, an alkoxy group, a trifluoromethyl group, a nitro group, an amino group or a halogen atom; or a substituted or unsubstituted benzyl group wherein the substituent is a halogen atom, R.sub.2 represents a hydrogen atom or an alkyl group and R.sub.3 represents a hydrogen atom, a hydroxyalkyl group, an alkyl group or a substituted aminoalkyl group, or R.sub.2 and R.sub.3 may form, when taken together with the nitrogen atom to which they are attached, a 5 or 6-membered heterocyclic group which may contain one oxygen as a hetero atom, and to a process for preparing the pyrazole derivatives represented by the formula (I) above.
The pyrazole derivatives according to the present invention exhibit potent analgesic and anti-inflammatory activities and, therefore, are useful as pharmaceuticals for treating and alleviating various inflammatory conditions in animals and human.
SUMMARY OF THE INVENTION
An object of the present invention is to provide novel pyrazole derivatives which are useful as analgesics and anti-inflammatory agents.
Another object of the present invention is to provide a process for preparing such novel pyrazole derivatives.
DETAILED DESCRIPTION OF THE INVENTION
The terms "alkyl" and "alkoxy" used throughout the specification and claims of this invention means an alkyl group having 1 to 4 carbon atoms, for example, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl and tert-butyl groups and the corresponding alkoxy groups.
The term "5- or 6-membered heterocyclic group" used for the group ##EQU1## in the above formula (I) includes a pyrrolidino or pyrrolidinyl group, a piperidino or piperidinyl group, a substituted piperazino or piperazinyl group wherein the substituent is an alkyl group having 1 to 4 carbon atom such as 4-methylpiperazino, or a morpholino or morpholinyl group.
The pyrazole derivatives of the present invention represented by the formula (I) above can easily be prepared by reacting a 5-alkoxypyrazole represented by the formula ##SPC3##
Wherein R and X are as defined above, and R.sub.1 represents an alkoxy group such as a methoxy or ethoxy group, a hydroxy group or a halogen atom such as a chlorine or bromine atom, with an amine represented by the formula ##EQU2## wherein R.sub.2 and R.sub.3 are as defined above. The process of this invention, i.e., an amidation of the 5-alkoxypyrazole (II), proceeds easily by reacting the 5-alkoxypyrazole with an amine corresponding to the amino group in the desired pyrazole derivative (I) in an inert organic solvent or in the presence of an excess amount of the amine which serves as both a solvent and a reactant. Generally, the reaction can be carried out in an inert organic solvent or in the presence of an excess of an amine (III) at a temperature of from about 0.degree.C to about 80.degree.C using at least an equimolar amount of the amine relative to a 5-alkoxypyrazole for a period of from about 20 minutes to about 16 hours.
The reaction conditions employed in the process of this invention somewhat vary depending upon the type of the starting material, in particular, the type of the substituent R.sub.1 in the 5-alkoxypyrazole (II) reaction.
When R.sub.1 represents an alkoxy group, i.e., the substituent at 3-position of the starting material (II) represents an alkyl ester --COOR.sub.1, the amidation can conveniently be carried out in an organic solvent such as alkanols having 1 to 4 carbon atoms, for example, methanol, ethanol and the like or benzene using about 1 to about 5 moles, preferably 2 to 5 moles of an amine per 1 mole of the 5-alkoxypyrazole while heat-refluxing the reaction mixture, generally at a temperature of from about 60 to about 80.degree.C, for a period of from about 1 to about 5 hours. A well-known condensing agent such as aluminum isopropoxide or sodium amide can be used in the amidation reaction to ensure a smooth reaction but the use of such a condensing agent is not essential. Alternatively, when the amine of the formula (III) has a low boiling point, e.g., in the range of below about 50.degree.C under atmospheric pressure, the reaction is advantageously carried out in a sealed reaction vessel under a pressurized condition, for example, in an autoclave under an autogenous pressure.
When R.sub.1 represents a --OH group, i.e., the substituent at 3-position of the starting material (II) represents a carboxy group --COOH, the amidation can advantageously be carried out in an inert organic solvent such as methylene chloride, chloroform and the like in the presence of a dehydrating agent, for example, N,N'-dicyclohexylcarbodiimide at a temperature of from ice-cooling temperature (about 10.degree.C) to room temperature (about 25.degree.C) for a period of from about 3 to about 16 hours, preferably 8 to 16 hours. In this reaction, the amine can advantageously be used from 1 to 2 moles per 1 mole of the 5-alkoxypyrazole (II).
When R.sub.1 represents a halogen atom, i.e., the substituent at 3-position of the starting material (II) represents an acid halide group, the amidation can easily be carried out by reacting an acid halide (II) with an amine (III) in an inert organic solvent such as ethyl ether, chloroform, benzene, pyridine, triethylamine and the like at a temperature of from ice-cooling temperature to room temperature for a period of from about 20 minutes to about 2 hours, preferably from 30 minutes to 1 hour. In this reaction, the amine reactant can advantageously be used in an excess amount, for example, from 2 to 5 molar excess so as to serve as an reactant as well as a reaction solvent.
The present invention also includes the pharmaceutically acceptable acid addition salts of the pyrazole derivatives of the formula (I). These acid addition salts can be prepared from the free base compound (I) by the conventional procedure, for example, by introducing hydrogen chloride gas into a solution of the free base compound in an organic solvent such as methanol to form the corresponding hydrochloride salt of the pyrazole derivatives. Typical examples of the pharmaceutically acceptable acid addition salts of the pyrazole derivatives (I) are hydrochloride, sulfate, phosphate, oxalate, fumarate, maleate, tartarate and the like.
As described previously, the pyrazole derivatives represented by the above formula (I) exhibit potent analgesic and anti-inflammatory activities. For example, 1-(p-tolyl)-3-N,N-dimethylcarbamoyl-5-methoxypyrazole (Compound A), 1-(m-trifluoromethylphenyl)-3-N,N-dimethylcarbamoyl-5-n-butoxypyrazole (Compound B), 1-(m-chlorophenyl)-3-N,N-dimethylcarbamoyl-5-methoxypyrazole (Compound C), 1-(m-chlorophenyl)-3-carbamoyl-5-methoxypyrazole (Compound D) and 1-(p-chlorobenzyl)-3-N-methylcarbamoyl-5-methoxypyrazole (E) exhibit an excellent analgesic activity as determined by the acetic acid stretching method and the pressure-stimulation method.
Acetic Acid Stretching Method
Each of the test compounds (Compounds A to E) was administered orally to ddN male mice weighing 17 to 20 g (5 to 7 mice per group) and 30 minutes after administration, a 0.7% aqueous solution of acetic acid was administered intraperitoneally to the mice in a dose of 0.1 ml per 10 g of the body weight. The number of stretching of the mice for a period of 5 minutes was then counted 15 and 30 minutes after the administration of the aqueous acetic acid and compared with the number of stretching in the control group which received only the aqueous acetic acid to determine the percent inhibitory of the test compounds. In this experiment, Compounds A to E were found to have a stretching inhibitory activity (analgesic activity) of 2.0, 4.0, 3.4, 2.2 and 1.6 times, respectively, higher than that of aminopyrine.
Pressure-Stimulation Method
Each of the test compounds (Compounds A to E) was administered orally to ddN male mice weighing 18 to 20 g (8 to 10 mice per group), and the pressure was applied to the tail using a pressure-stimulation apparatus (Takagi et al apparatus). The reaction of the mice, i.e., turning of the head toward the stimulated portion and biting behavior, was observed as a criterion and the pain threshold was determined. In this experiment, Compounds A to E were found to have an analgesic activity of 1.8, 1.6, 2.5, 2.0 and 1.8 times, respectively, higher than that of aminopyrine.
The compounds of this invention also possess an excellent anti-inflammatory activity as determined by the well-established carrageenin-induced edema inhibitory activity.
Carrageenin-Induced Edema Inhibitory Activity
Each of the test compounds (Compounds A to E) was administered orally to Wister male rats weighing about 150 g (7 to 8 rats per group) and 30 minutes after the administration of the test compound, 0.1 ml of a 1% aqueous solution of carrageenin was administered subcutaneously to a hind paw of the rats. Thereafter, the volume of the paw was measured at an interval of 1 hour to determine the swelling ratio of the paw relative to the volume of the same paw before administration of the aqueous carrageenin. The edema inhibitory activity was calculated by comparing the swelling ratio in the control group which received only the test compounds. In this experiment, Compounds A to E were found to have an edema inhibitory activity of 1.8, 2.0, 3.5, 2.2 and 1.9 times, respectively, higher than that of aminopyrine.
The acute toxicity of the test compounds was also determined in rats by oral administration in the standard method and found to be 1620 mg/kg, 760 mg/kg, 950 mg/kg, 930 mg/kg and 540 mg/kg, respectively in terms of a 50% lethal dose (LD.sub.50).

The present invention is further illustrated by the following Examples, but they are not to be construed as limiting the scope of this invention.
EXAMPLE 1
1-(m-Trifluoromethylphenyl)-3-N,N-dimethylcarbamoyl-5-n-butoxypyrazole
34.7 g of 1-(m-trifluoromethylphenyl)-5-n-butoxypyrazol-3-yl carbonyl chloride was dissolved in 150 ml of ethyl ether, and to the resulting solution was added dropwise 50 ml of a solution containing 11 g of dimethylamine in ethyl ether while cooling the mixture to a temperature of 10.degree.C with stirring. After allowing to stand for 1 hour, the reaction mixture was washed successively with 5% hydrochloric acid, 5% aqueous sodium carbonate and water. The ethereal layer was separated and dried over anhydrous sodium sulfate. The solvent (ethyl ether) was then removed by distillation and the resulting residue was recrystallized from n-pentane to give 29.8 g (83.9% yield) of 1-(m-trifluoromethylphenyl)-3-N,N-dimethylcarbamoyl-5-n-butoxypyrazole as colorless prisms having a melting point of 66.degree. to 68.degree.C.
Analysis
Calcd. for C.sub.17 H.sub.20 O.sub.2 N.sub.3 F.sub.3 (Molecular Weight: 355.4): C, 57.46; H, 5.67; N, 11.82. Found: C, 57.62; H, 5.75; N, 11.84.
EXAMPLE 2
1-(p-Tolyl)-3-N,N-dimethylcarbamoyl-5-methoxypyrazole
23.2 g of 1-(p-tolyl)-3-carboxy-5-methoxypyrazole was dissolved in 100 ml of chloroform, and to the resulting solution was added a solution containing 4 g of dimethylamine in 20 ml of chloroform while cooling the mixture to a temperature of 5.degree. to 10.degree.C with stirring. 50 ml of a solution of 10 g of N,N-dicyclohexylcarbodiimide in chloroform was then added dropwise to the resulting mixture and, after completion of the addition, the mixture was allowed to cool to room temperature followed by stirring for 7 hours. The reaction mixture was then made acidic with acetic acid and the precipitated crystals were then removed by filtration. The solvent was removed from the filtrate by distillation and the resulting residue was washed successively with 5% aqueous sodium hydroxide and water. Recrystallization from ethyl ether-petroleum ether gave 12 g (46.3% yield) of 1-(p-tolyl)-3-N,N-dimethylcarbamoyl-5-methoxypyrazole is colorless prisms having a melting point of 120.degree. - 121.degree.C.
Analysis
Calcd. for C.sub.14 H.sub.17 O.sub.2 N.sub.3 (Molecular Weight: 259.3) C, 64.85; H, 6.61; N, 16.20. Found: C, 65.06; H, 6.54; N, 16.07.
The combined washings obtained above, i.e., the 5% aqueous sodium hydroxide and water, was made acidic with hydrochloric acid and the precipitated crystals were separated by filtration to recover 10.3 g (44.4% yield) of the unreacted starting material, 1-(p-tolyl)-3-carboxy-5-methoxypyrazole.
EXAMPLE 3
1-(p-Chlorobenzyl)-3-carbamoyl-5-n-butoxypyrazole
A mixture consisting of 6.7 g of 1-(p-chlorobenzyl)-3-ethoxycarbonyl-5-n-butoxypyrazole, 30 ml of a 28% aqueous ammonia solution and 30 ml of methanol was placed in an autoclave and heated at a temperature of 60.degree.C for 2 hours. After completion of the reaction, the solvent was removed by distillation and the residue was recrystallized from methanol-petroleum ether to give 5.3 g (86.2% yield) of 1-(p-chlorobenzyl)-3-carbamoyl-5-n-butoxypyrazole as colorless needles having a melting point of 137.degree. - 138.degree.C.
Analysis
Calcd. for C.sub.15 H.sub.18 O.sub.2 N.sub.3 Cl (Molecular Weight: 307.8): C, 58.54; H, 5.89; N, 13.65. Found: C, 58.66; H, 5.86; N, 13.62.
EXAMPLE 4
1-(p-Chlorobenzyl)-3-(4'-methylpiperazinyl)-carbonyl-5-methoxypyrazole hydrochloride
5.7 g of 1-(p-chlorobenzyl)-5-methoxypyrazol-3-yl carbonyl chloride was dissolved in 60 ml of benzene, and to the resulting solution was added dropwise 3 g of N-methylpiperazine with stirring. After allowing the reaction mixture to stand for 20 minutes, the mixture was washed well successively with 10% aqueous sodium hydroxide and water. The benzene layer was then separated and dried, and the benzene was then removed by distillation. The resulting residue was dissolved in methanol and hydrogen chloride gas was introduced into the methanolic solution. The methanol was then removed by distillation and the resulting crystals were recrystallized from methanol-ethyl ether to give 5.4 g (70.1% yield) of 1-(p-chlorobenzyl)-3-(4'-methylpiperazinyl)-carbonyl-5methoxypyrazole hydrochloride as a colorless crystalline powder having a melting point of 223.degree. to 225.degree.C (with decomposition).
Analysis
Calcd. for C.sub.17 H.sub.21 O.sub.2 N.sub.4 Cl.HCl (Molecular Weight: 385.3): C, 53.00; H, 5.76; N, 14.54. Found: C, 52.94; H, 5.83; N, 14.41.
EXAMPLE 5
1-(p-Chlorophenyl)-3-N,N-dimethylcarbamoyl-5-n-butoxypyrazole
A mixture consisting of 16.1 g of 1-(p-chlorophenyl)-3-ethoxycarbonyl-5-n-butoxypyrazole, 4 g of dimethylamine and 200 ml of ethanol was placed in an autoclave and heated at a temperature of from 70.degree. to 80.degree.C for 4 hours with stirring. After completion of the reaction, the solvent was removed by distillation, and the residue was washed successively with 5% hydrochloric acid and water. Recrystallization from ethyl ether-petroleum ether gave 11.8 g (73.3% yield) of 1-(p-chlorophenyl)-3-N,N-dimethylcarbamoyl-5-n-butoxypyrazole as colorless needles having a melting point of 94 to 95.degree.C.
Analysis
Calcd. for C.sub.16 H.sub.20 O.sub.2 N.sub.3 Cl (Molecular Weight: 321.8): C, 59.72; H, 6.26; N, 13.06. Found: C, 59.85; H, 6.31; N, 12.98.
EXAMPLE 6
1-(p-Tolyl)-3-N,N-dimethylcarbamoyl-5-n-butoxypyrazole
29.3 g of 1-(p-tolyl)-5-n-butoxypyrazol-3-yl carbonyl chloride was dissolved in 150 ml of benzene, and to the resulting solution was added dropwise a solution of 11 g of dimethylamine in 50 ml of benzene while maintaining the mixture at a temperature of from 10 to 15.degree.C with stirring. The reaction mixture was then worked up in the same manner as described in Example 1 and the product thus obtained was recrystallized from ethyl ether-petroleum ether to give 24.1 g (80.0% yield) of 1-(p-tolyl)-3-N,N-dimethylcarbamoyl-5-n-butoxypyrazole as colorless plates having a melting point of 99 - 100.degree.C.
Analysis
Calcd. for C.sub.17 H.sub.23 O.sub.2 N.sub.3 (Molecular Weight: 301.4): C, 67.75; H, 7.69; N, 13.94. Found: C, 67.78; H, 7.78; N, 13.81.
EXAMPLE 7
1-(p-Chlorophenyl)-3-N,N-dimethylcarbamoyl-5-methoxypyrazole
25.3 g of 1-(p-chlorophenyl)-3-carboxy-5-methoxypyrazole was dissolved in 100 ml of methylene chloride, and to the resulting solution was added dropwise a solution of 4 g of dimethylamine in 20 ml of methylene chloride while maintaining the mixture at a temperature of from 5 to 10.degree.C with stirring. A solution of 10 g of N,N-8-dicyclohexylcarbodiimide in 50 ml of methylene chloride was then added dropwise to the mixture. The reaction mixture was then worked up in the same manner as described in Example 2 and the product thus obtained was recrystallized from ethyl ether-petroleum ether to give 12.7 g (45.4% yield) of 1-(p-chlorophenyl)-3-N,N-dimethylcarbamoyl-5-methoxypyrazole as colorless prisms having a melting point of 116.degree. - 118.degree.C.
Analysis
Calcd. for C.sub.13 H.sub.14 O.sub.2 N.sub.3 Cl (Molecular Weight: 279.7): C, 55.82; H, 5.04; N, 15.02. Found: C, 55.75; H, 5.06; N, 15.02.
In the same manner as described in the proceeding Examples, the following compounds were also prepared from a 5-alkoxypyrazole (II) and an amine (III).
Recrystal- Empirical Analysis (%)Example Crystal lization Melting formula Calcd. (Found)No. Compound form solvent point (M. W.) C H N__________________________________________________________________________8 1-(p-tolyl-3-N,N-dimethyl- Colorless Ethyl ether- 90-91 C.sub.16 H.sub.21 O.sub.2 N.sub.3 66.88 7.34 14.62 carbamoyl-5-isopropoxy- Prisms petroleum (287.4) (66.78 7.45 14.68) pyrazole ether9 1-(p-chlorophenyl)-3-N,N- Colorless Ethyl ether- 107-108 C.sub.14 H.sub.16 O.sub.2 N.sub.3 Cl 57.24 5.49 14.30 dimethylcarbamoyl-5- Needles petroleum (293.8) (57.20 5.50 14.14) ethoxypyrazole ether10 1-(p-chlorophenyl)-3-N,N- Colorless Ethyl ether- 83-84 C.sub.15 H.sub.18 O.sub.2 N.sub.3 Cl 58.54 5.89 13.65 dimethylcarbamoyl-5-n- Prisms petroleum (307.8) (58.71 5.95 13.66) propoxypyrazole ether11 1-(m-chlorophenyl)-3-N,N- Colorless Ethyl ether 98-99 C.sub.13 H.sub.14 O.sub.2 N.sub.3 Cl 55.82 5.04 15.02 dimethylcarbamoyl-5- Prisms (279.7) (56.01 5.01 14.94) methoxypyrazole12 1-(m-trifluoromethylphenyl)- Colorless Petroleum 83-84 C.sub.16 H.sub.18 O.sub.2 N.sub.3 F.sub.3 56.30 5.32 12.31 3-N,N-dimethylcarbamoyl-5- Prisms benzine (341.3) (56.17 5.33 12.33) n-propoxypyrazole13 1-(m-trifluoromethylphenyl)- Colorless Petroleum 83-84 C.sub.15 H.sub.16 O.sub.2 N.sub.3 F.sub.3 55.05 4.93 12.84 3-N,N-dimethylcarbamoyl-5- Needles benzine (327.3) (55.21 4.98 12.83) ethoxypyrazole14 1-(m-trifluoromethylphenyl)- Colorless Benzene- 116-117 C.sub.14 H.sub.14 O.sub.2 N.sub.3 F.sub.3 53.68 4.50 13.41 3-N,N-dimethylcarbamoyl-5- Needles petroleum (313.3) (53.75 4.41 13.20) methoxypyrazole ether15 1-(p-tolyl)-3-morpholino- Colorless -- b.p. C.sub.16 H.sub.19 O.sub.3 N.sub.3 63.77 6.36 13.94 carbonyl-5-methoxypyrazole Oil 130-131/ (301.3) (63.93 6.45 13.76) 2 mmHg16 1-(p-chlorophenyl)-3-(4'- Colorless Ethanol- 116-117 C.sub.16 H.sub.19 O.sub.2 N.sub.4 Cl 57.40 5.72 16.73 methylpiperazinyl)- Needles Petroleum (334.8) (57.34 5.79 16.52) carbonyl-5-methoxypyrazole ether- Ethyl ether17 1-(m-chlorophenyl)-3-N,N- Colorless Ethyl ether- 102-103 C.sub.17 H.sub.22 O.sub.2 N.sub.3 Cl 60.80 6.60 12.51 diisopropylcarbamoyl-5- Prisms Petroleum (335.8) (60.86 6.53 12.37) methoxypyrazole ether18 1-(m-chlorophenyl)-3- Colorless Ethyl ether- 73-74 C.sub.15 H.sub.16 O.sub.3 N.sub.3 Cl 55.99 5.01 13.06 morpholinocarbonyl-5- Needles Petroleum (321.8) (56.06 4.94 13.02) methoxypyrazole ether19 1-(m-chlorophenyl)-3-(4'- Colorless Ethyl ether- 76-77 C.sub.16 H.sub.19 O.sub.2 N.sub.4 Cl 57.40 5.72 16.73 methylpiperazinyl)- Crystalline Petroleum (334.8) (57.36 5.64 16.64) carbonyl-5-methoxypyrazole Powder ether20 1-(p-chlorophenyl)-3-N,N- Colorless Methanol- 126-127 C.sub.17 H.sub.22 O.sub.2 N.sub.3 Cl 60.80 6.60 12.51 diisopropylcarbamoyl-5- Plates Petroleum (335.8) (60.68 6.61 12.59) methoxypyrazole ether21 1-(p-tolyl)-3-N,N- Colorless Ethanol- 95-96 C.sub.17 H.sub.25 O.sub.2 N.sub.3 67.30 8.31 13.85 diisopropylcarbamoyl-5- Plates Petroleum (303.4) (67.47 8.27 13.72) methoxypyrazole ether22 1-(p-chlorophenyl)-3- Colorless Ethanol- 109-110 C.sub.14 H.sub.16 O.sub.3 N.sub.3 Cl 54.29 5.21 13.57 morpholinocarbonyl-5- Needles Petroleum (309.8) (54.16 5.21 13.55) methoxypyrazole ether23 1-(p-chlorophenyl)-3- Colorless Ethanol- 156-158 C.sub.15 H.sub.16 O.sub.2 N.sub.3 Cl 58.92 5.27 13.74 (pyrrolidin-1-yl)-carbonyl- Needles Petroleum (305.8) (58.98 5.34 13.58) 5-methoxypyrazole ether24 1-(p-chlorophenyl)-3-N- Colorless Ethanol- 121-122 C.sub.12 H.sub.12 O.sub.2 N.sub.3 Cl 54.25 4.55 15.81 methylcarbamoyl-5- Crystalline Petroleum (265.7) (54.25 4.44 15.94) methoxypyrazole Powder ether25 1-(p-chlorophenyl)-3-N- Colorless Ethanol- 53-54 C.sub.15 H.sub.18 O.sub.2 N.sub.3 Cl 58.54 5.89 13.65 n-butylcarbamoyl-5- Prisms Petroleum (307.8) (58.69 5.86 13.51) methoxypyrazole ether26 1-(m-chlorophenyl)-3-N- Colorless Ethyl ether- 136-137 C.sub.12 H.sub.12 O.sub.2 N.sub.3 Cl 54.25 4.55 15.81 methylcarbamoyl-5- Crystalline Petroleum (265.7) (54.42 4.61 15.72) methoxypyrazole Powder ether27 1-(m-chlorophenyl)-3-N- Colorless Ethyl ether- 96-97 C.sub.15 H.sub.18 O.sub.2 N.sub.3 Cl 58.54 5.89 13.65 sec-butylcarbamoyl-5- Needles Petroleum (307.8) (58.67 5.93 13.50) methoxypyrazole ether28 1-(m-chlorophenyl)-3- Colorless Ethyl ether- 111-112 C.sub.15 H.sub.16 O.sub.2 N.sub.3 Cl 58.92 5.27 13.74 (pyrrolidin-1-yl)-carbonyl- Prisms Petroleum (305.8) (59.13 5.30 13.71) 5-methoxypyrazole ether29 1-(o-chlorophenyl)-3-N,N- Colorless Methanol- 142-144 C.sub.13 H.sub.14 O.sub.2 N.sub.3 Cl 55.82 5.04 15.02 dimethylcarbamoyl-5- Plates Petroleum (279.7) (55.96 5.08 15.01) methoxypyrazole ether30 1-(m-chlorophenyl)-3-N- Colorless Ethyl ether- 77-78 C.sub.15 H.sub.18 O.sub.2 N.sub.3 Cl 58.54 5.89 13.65 methylcarbamoyl-5-n- Needles Petroleum (307.8) (58.51 5.93 13.52) butoxypyrazole ether31 1-(m-chlorophenyl)-3-N,N- Colorless Ethyl ether- 63-64 C.sub.16 H.sub.20 O.sub.2 N.sub. 3 Cl 59.72 6.26 13.06 dimethylcarbamoyl-5-n- Plates Petroleum (321.8) (59.86 6.24 12.89) butoxypyrazole ether32 1-(m-chlorophenyl)-3- Colorless Ethyl ether- 81-82 C.sub.18 H.sub.22 O.sub.2 N.sub.3 Cl 62.15 6.38 12.08 (pyrrolidin-1-yl)-carbonyl- Needles Petroleum (347.8) (62.32 6.40 12.12) 5-n-butoxypyrazole ether33 1-(m-chlorophenyl)-3- Colorless Ethyl 150-152 C.sub.11 H.sub.10 O.sub.2 N.sub.3 Cl 52.50 4.01 16.70 carbamoyl-5-methoxypyrazole Needles acetate (251.7) (52.57 4.03 16.61)34 1-(m-chlorophenyl)-3-N- Colorless Ethyl ether- 85-86 C.sub.13 H.sub.14 O.sub.2 N.sub.3 Cl 51.53 5.04 15.02 ethylcarbamoyl-5- Needles Petroleum (279.7) (51.65 5.00 14.88) methoxypyrazole benzine35 1-(m-chlorophenyl)-3-N- Colorless -- b.p. C.sub.15 H.sub.18 O.sub.2 N.sub.3 Cl 58.54 5.89 13.65 n-butylcarbamoyl-5- Oil 215/ (307.8) (58.71 5.96 13.52) methoxypyrazole 1 mmHg36 1-(m-chlorophenyl)-3-N-(2'- Colorless Ethanol- 143-145 C.sub.13 H.sub.14 O.sub.3 N.sub.3 Cl 52.80 4.77 14.21 hydroxyethyl)-carbamoyl-5- Needles Petroleum (295.7) (52.93 4.81 14.20) methoxypyrazole ether37 1-(m-chlorophenyl)-3-N,N- Colorless Ethyl ether- 76-77 C.sub.15 H.sub.18 O.sub.2 N.sub.3 Cl 58.54 5.89 13.65 diethylcarbamoyl-5- Needles Petroleum (307.8) (58.67 5.87 13.59) methoxypyrazole ether38 1-(m-chlorophenyl)-3-N- Colorless -- C.sub.14 H.sub.16 O.sub.3 N.sub.3 Cl 54.29 5.21 13.57 methyl-N-(2'-hydroxyethyl)- Oil (309.8) (54.17 5.30 13.39) carbamoyl-5-methoxypyrazole39 1-(m-chlorophenyl)-3- Colorless -- b.p. C.sub.16 H.sub.18 O.sub.2 N.sub.3 Cl 60.09 5.67 13.14 (piperidin-1-yl)-carbonyl- Oil 215/ (319.8) (60.26 5.59 13.06) 5-methoxypyrazole 5 mmHg40 1-(m-chlorophenyl)-3-N- Colorless Methanol- 130-132 C.sub.20 H.sub.29 O.sub.2 N.sub.4 Cl. 54.71 6.47 11.60 (N',N'-diethylaminoethyl)- Crystalline Petroleum C.sub.2 H.sub.2 O.sub.4 (54.89 6.62 11.38) carbamoyl-5-n-butoxypyrazole Powder ether (483.0) oxalate41 1-(m-chlorophenyl)-3-N- Colorless Methanol- 141-143 C.sub.17 H.sub.23 O.sub.2 N.sub.4 Cl. 51.76 5.72 12.71 (N',N'-diethylaminoethyl)- Crystalline Petroleum C.sub.2 O.sub.4 H.sub.2 (51.62 5.76 12.54) carbamoyl-5-methoxypyrazole Powder ether (440.9) oxalate42 1-(p-chlorophenyl)-3-N- Colorless Methanol- 170-171 C.sub.17 H.sub.23 O.sub.2 N.sub.4 Cl. 47.85 6.13 11.75 (N', N'-diethylaminoethyl)- Crystalline Ethyl (decom- 2H.sub.2 O.C.sub.2 H.sub.2 O.sub.4 (48.06 6.15 11.64) carbamoyl-5-methoxypyrazole Powder acetate position) (476.9) oxalate dihydrate43 1-(m-nitrophenyl)-3-N,N- Colorless Hydrated 147-148 C.sub.13 H.sub.14 O.sub.4 N.sub.4 53.79 4.86 19.30 dimethylcarbamoyl-5- Needles acetone (290.3) (53.92 4.73 19.31) methoxypyrazole44 1-(m-aminophenyl)-3-N,N- Colorless Ethyl 118-119 C.sub.13 H.sub.16 O.sub.2 N.sub.3 59.99 6.20 21.52 dimethylcarbamoyl-5- Needles acetate (260.3) (60.18 6.04 21.36) methoxypyrazole45 1-(p-chlorobenzyl)-3-N- Colorless Ethyl ether- 93-95 C.sub.13 H.sub.14 O.sub.2 N.sub.3 Cl 55.82 5.04 15.02 methylcarbamoyl-5- Needles Petroleum (279.7) (55.95 5.13 15.01) methoxypyrazole ether46 1-(p-chlorobenzyl)-3-N- Colorless Ethyl ether- 63-64 C.sub.16 H.sub.20 O.sub.2 N.sub.3 Cl 59.72 6.26 13.06 sec-butylcarbamoyl-5- Granules Petroleum (321.8) (59.93 6.35 12.92) methoxypyrazole ether47 1-(3,4-dichlorophenyl)-3- Colorless Hydrated 107-108 C.sub.13 H.sub.13 O.sub.2 N.sub.3 Cl.sub.2 49.70 4.17 13.37 N,N-dimethylcarbamoyl-5- Needles Methanol (314.2) (49.78 4.15 13.24) methoxypyrazole48 1-(3,4-dichlorophenyl)-3- Colorless Ethyl ether- 64-65 C.sub.17 H.sub.22 O.sub.2 N.sub.4 Cl.sub.2 53.00 5.76 14.54 N-(N',N'-diethylaminoethyl)- Needles Petroleum (385.3) (52.94 5.70 14.68) carbamoyl-5-methoxypyrazole ether49 1-(p-chlorobenzyl)-3-N,N- Colorless Isopropyl 70-71 C.sub.14 H.sub.16 O.sub.2 N.sub.3 Cl 57.24 5.49 14.30 dimethylcarbamoyl-5- Flakes ether- (293.8) (57.37 5.52 14.21) methoxypyrazole Petroleum benzine50 1-(p-chlorobenzyl)-3- Colorless Ligroin 115-117 C.sub.16 H.sub.18 C.sub.3 N.sub.3 Cl 57.23 5.40 12.51 morpholinocarbonyl-5- Needles (335.8) (57.38 5.32 12.29) methoxypyrazole51 1-(p-chlorobenzyl)-3-N-n- Colorless to -- b.p. C.sub.16 H.sub.20 O.sub.2 N.sub.3 Cl 59.72 6.26 13.06 butylcarbamoyl-5- Pale Yellow 248/ (321.8) (59.93 6.37 12.88) methoxypyrazole Oil 6 mmHg52 1-(p-chlorobenzyl)-3-N,N- Colorless Ethyl ether- 89-90 C.sub.18 H.sub.24 O.sub.2 N.sub.3 Cl 61.80 6.91 12.01 diisopropylcarbamoyl-5- Prisms Petroleum (349.9) (61.63 6.92 11.86) methoxypyrazole ether53 1-(p-chlorobenzyl)-3- Colorless Ethyl ether- 97-99 C.sub.16 H.sub.18 O.sub.2 N.sub.3 Cl 60.09 5.67 13.14 (pyrrolidin-1-yl)-carbonyl- eedles Petroleum (319.8) (60.26 5.67 13.12) 5-methoxypyrazole ether54 1-(p-chlorobenzyl)-3- Colorless Ethyl 144-146 C.sub.12 H.sub.12 O.sub.2 N.sub.3 Cl 54.25 4.55 15.81 carbamoyl-5-methoxypyrazole Plates acetate (265.7) (54.38 4.62 15.68)55 1-(p-chlorobenzyl)-3-N- Colorless Ethanol- 155-157 C.sub.18 H.sub.25 O.sub.2 N.sub.4 Cl. 52.81 5.98 12.32 (N',N'-diethylaminoethyl)- Crystalline Ethyl ether (decom- C.sub.2 H.sub.2 O.sub.4 (52.58 6.12 12.16) carbamoyl-5-methoxypyrazole Powder position) (454.9) oxalate56 1-(p-chlorobenzyl)-3-N- Colorless Methanol- 124-125 C.sub.16 H.sub.20 O.sub.2 N.sub.3 Cl 59.72 6.26 13.06 methylcarbamoyl-5-n- Flakes Petroleum (321.8) (59.68 6.30 13.22) butoxypyrazole ether57 1-(p-chlorobenzyl)-3-N-n- Colorless Ethyl ether- 70-71 C.sub.19 H.sub.26 O.sub.2 N.sub.3 Cl 62.71 7.20 11.55 butylcarbamoyl-5-n- Needles Petroleum (363.9) (62.88 7.28 11.36) butoxypyrazole ether58 1-(p-chlorobenzyl)-3-N,N- Colorless Ethyl ether- 60-61 C.sub.17 H.sub.22 O.sub.2 N.sub.3 Cl 60.80 6.60 12.51 dimethylcarbamoyl-5-n- Needles Petroleum (335.8) (60.87 6.59 12.37) butoxypyrazole ether59 1-(p-chlorobenzyl)-3- Colorless Ethyl ether- 85-86 C.sub.19 H.sub.24 O.sub.3 N.sub.3 Cl 60.39 6.40 11.12 morpholinocarbonyl-5-n- Needles Petroleum (377.9) (60.53 6.28 11.15) butoxypyrazole ether60 1-(p-chlorobenzyl)-3-N,N- Colorless Ethyl ether- 73-74 C.sub.21 H.sub.30 O.sub.2 N.sub.3 Cl 64.35 7.72 10.72 diisopropylcarbamoyl-5-n- Granules Petroleum (391.9) (64.38 7.63 10.59) butoxypyrazole ether61 1-(p-chlorobenzyl)-3- Colorless Ethyl ether- 86-87 C.sub.19 H.sub.24 O.sub.2 N.sub.4 Cl 63.06 6.68 11.61 (pyrrolidin-1-yl)-carbonyl- Needles Petroleum (361.9) (63.27 6.67 11.59) 5-n-butoxypyrazole ether62 1-(p-chlorobenzyl)-3-N- Colorless Ethanol- 138-140 C.sub.21 H.sub.31 O.sub.2 N.sub.4 Cl. 55.59 6.69 11.27 (N',N'-diethylaminoethyl)- Crystalline Ethyl C.sub.2 H.sub.2 O.sub.4 (55.76 6.73 11.11) carbamoyl-5-n-butoxypyrazole Powder ether (497.0) oxalate63 1-(p-chlorobenzyl)-3-(4'- Colorless Acetone- 92-93.5 C.sub.20 H.sub.27 O.sub.2 N.sub.4 Cl 61.45 6.96 14.33 methylpiperazinyl)-carbonyl- Needles Petroleum (390.9) (61.62 6.85 14.26) 5-n-butoxypyrazole ether64 1-(o-chlorobenzyl)-3- Colorless Hydrated 163-164 C.sub.12 H.sub.12 O.sub.2 N.sub.3 Cl 54.25 4.55 15.81 carbamoyl-5-methoxypyrazole Needles ethanol (265.7) (54.29 4.48 15.73)65 1-(o-chlorobenzyl)-3-N- Colorless Ethanol- 131-132 C.sub.13 H.sub.14 O.sub.2 N.sub.3 Cl 55.82 5.04 15.02 methylcarbamoyl-5- Needles Petroleum (279.7) (55.98 5.05 15.00) methoxypyrazole ether66 1-(o-chlorobenzyl)-3-N,N- Colorless Ethanol- 135-136 C.sub.14 H.sub.16 O.sub.2 N.sub.3 Cl 57.24 5.49 14.30 dimethylcarbamoyl-5- Needles Petroleum (293.8) (57.41 5.46 13.36) methoxypyrazole ether67 1-(o-chlorobenzyl)-3-N,N- Colorless Ethanol- 130-131 C.sub. 18 H.sub.24 O.sub.2 N.sub.3 Cl 61.80 6.91 12.01 diisopropylcarbamoyl-5- Prisms Petroleum (349.9) (61.72 6.97 11.82) methoxypyrazole ether68 1-(o-chlorobenzyl)-3-(4'- Colorless Ethanol- 91-92 C.sub.17 H.sub.21 O.sub.2 N.sub.4 Cl 58.53 6.07 16.06 methylpiperazinyl)-carbonyl- Prisms Petroleum (348.8) (58.69 6.13 15.93) 5-methoxypyrazole ether69 1-(m-bromophenyl)-3- Colorless Hydrated 159-161 C.sub.11 H.sub.10 O.sub.2 N.sub.3 Br 44.62 3.40 14.19 carbamoyl-5-methoxypyrazole Needles Methanol (296.1) (44.63 3.41 14.13)70 1-(m-bromophenyl)-3-N- Colorless Ethyl ether- 109-110 C.sub.12 H.sub.12 O.sub.2 N.sub.3 Br 46.47 3.90 13.55 methylcarbamoyl-5- Prisms Petroleum (310.2) (46.61 3.83 13.32) methoxypyrazole ether71 1-(m-bromophenyl)-3-N- Colorless Ethyl ether- 80-81 C.sub.13 H.sub.14 O.sub.2 N.sub.3 Br 48.17 4.35 12.96 ethylcarbamoyl-5- Prisms Petroleum (324.2) (48.25 4.23 12.78) methoxypyrazole ether72 1-(m-bromophenyl)-3-N,N- Colorless Hydrated 88-89 C.sub.13 H.sub.14 O.sub.2 N.sub.3 Br 48.17 4.35 12.96 dimethylcarbamoyl-5- Prisms Methanol (324.2) (48.10 4.31 12.91) methoxypyrazole73 1-(p-methoxyphenyl)-3-N,N- Colorless Ethanol- 112-113.5 C.sub.14 H.sub.17 O.sub.3 N.sub.3 61.08 6.22 15.26 dimethylcarbamoyl-5- Prisms Petroleum (275.3) (60.95 6.18 15.18) methoxypyrazole ether74 1-(p-methoxyphenyl)-3- Colorless Ethyl ether- 86-87 C.sub.16 H.sub.19 O.sub.4 N.sub.3 60.56 6.03 13.24 morpholinocarbonyl-5- Needles Petroleum (317.3) (60.59 5.92 13.10) methoxypyrazole ether__________________________________________________________________________
While the invention is described in detail with reference to specific embodiments thereof, it is to be noted that various changes and modifications can be made therein without departing from the spirit and the scope of the invention.

Pyrazole derivatives and process for preparing the same

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