CA2029838C - Process for the preparation of aminotriazine derivatives - Google Patents
Process for the preparation of aminotriazine derivatives Download PDFInfo
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- CA2029838C CA2029838C CA002029838A CA2029838A CA2029838C CA 2029838 C CA2029838 C CA 2029838C CA 002029838 A CA002029838 A CA 002029838A CA 2029838 A CA2029838 A CA 2029838A CA 2029838 C CA2029838 C CA 2029838C
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D253/00—Heterocyclic compounds containing six-membered rings having three nitrogen atoms as the only ring hetero atoms, not provided for by group C07D251/00
- C07D253/02—Heterocyclic compounds containing six-membered rings having three nitrogen atoms as the only ring hetero atoms, not provided for by group C07D251/00 not condensed with other rings
- C07D253/06—1,2,4-Triazines
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D271/00—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms
- C07D271/02—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms not condensed with other rings
- C07D271/10—1,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D271/00—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms
- C07D271/02—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms not condensed with other rings
- C07D271/10—1,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles
- C07D271/113—1,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles with oxygen, sulfur or nitrogen atoms, directly attached to ring carbon atoms, the nitrogen atoms not forming part of a nitro radical
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
- C07D413/06—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
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- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
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Abstract
A process for the preparation of aminotriazine derivatives of the formula (see formula I) wherein R is hydrogen, C1-C6alkyl, C3-C6cycloalkyl, C1-C4alkyl substituted by from 1 to 10 halogen atoms or by from 1 to 3 radicals from the group C1-C3alkoxy, C1-C3alkylthio and phenyl, phenyl or phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, which process comprises reacting with hydrazine hydrate a compound of formula II
(see formula II) wherein R1 is hydrogen, C1-C4alkyl, C3-C6cycloalkyl, C1-C4alkyl substituted by from 1 to 9 chlorine atoms, C1-C3alkoxy, C1-C3alkylthio, C1-C3alkylsulfinyl, C1-C3alkylsulfonyl, phenyl, phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, or pyridyl, and subjecting the resulting compound of formula III
(see formula III) to acid hydrolysis. The compounds prepared in accordance with the invention are suitable as starting materials for the preparation of effective pesticides.
(see formula II) wherein R1 is hydrogen, C1-C4alkyl, C3-C6cycloalkyl, C1-C4alkyl substituted by from 1 to 9 chlorine atoms, C1-C3alkoxy, C1-C3alkylthio, C1-C3alkylsulfinyl, C1-C3alkylsulfonyl, phenyl, phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, or pyridyl, and subjecting the resulting compound of formula III
(see formula III) to acid hydrolysis. The compounds prepared in accordance with the invention are suitable as starting materials for the preparation of effective pesticides.
Description
~0~:~83~
PS/5-17831/=
Process for the preparation of aminotriazine derivatives The present invention relates to a novel process for the preparation of 4-amino-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines.
The invention relates to a process for the preparation of a compound of formula I
H H
R ~ 6 5 QN-NH2 N~ 2~O
/N
H
wherein R is hydrogen, Ct-C6alkyl, C3-C6cycloalkyl, Ct-C4alkyl substituted by from 1 to halogen atoms or by from 1 to 3 radicals from the group Ct-C3alkoxy, Ct-C3alkylthio and phenyl, phenyl or phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, which process comprises reacting with hydrazine hydrate a compound of formula II
Rt l 1 2~0 (II~
~''~O~
wherein Rt is hydrogen, Ct-C4alkyl, C3-Cbcycloalkyl, Cl-C4alkyl substituted by from 1 to 9 chlorine atoms, Ct-C3alkoxy, Ct-C3alkylthio, Ct-C3alkylsulfinyl, Cl-C3alkylsulfonyl, phenyl, phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, or pyridyl, and R is as defined above; and subjecting the resulting compound of formula III
~,~2~38~~
PS/5-17831/=
Process for the preparation of aminotriazine derivatives The present invention relates to a novel process for the preparation of 4-amino-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines.
The invention relates to a process for the preparation of a compound of formula I
H H
R ~ 6 5 QN-NH2 N~ 2~O
/N
H
wherein R is hydrogen, Ct-C6alkyl, C3-C6cycloalkyl, Ct-C4alkyl substituted by from 1 to halogen atoms or by from 1 to 3 radicals from the group Ct-C3alkoxy, Ct-C3alkylthio and phenyl, phenyl or phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, which process comprises reacting with hydrazine hydrate a compound of formula II
Rt l 1 2~0 (II~
~''~O~
wherein Rt is hydrogen, Ct-C4alkyl, C3-Cbcycloalkyl, Cl-C4alkyl substituted by from 1 to 9 chlorine atoms, Ct-C3alkoxy, Ct-C3alkylthio, Ct-C3alkylsulfinyl, Cl-C3alkylsulfonyl, phenyl, phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, or pyridyl, and R is as defined above; and subjecting the resulting compound of formula III
~,~2~38~~
H H
R ~ 'N-NH-CO--Rt (III) N~ ~O
H
to hydrolysis, preferably acid hydrolysis.
The present process is preferably used for the preparation of compounds of formula I
wherein R is methyl, ethyl, isopropyl, tert.-butyl or cyclopropyl. The process is preferably carried out using compounds of formula II wherein Rt is Ct-C4alkyl as starting materials.
The aminotriazine derivatives of formula I prepared according to the invention can be used as intermediates for the preparation of 4-((pyrid-3-yl)-methyleneamino]-or 4-[(pyrid-3-yl)-methylamino]-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines, which are distinguished by pronounced insecticidal and acaricidal activity. Such pesticidal compounds are, for example, 4-[(pyrid-3-ylj-methyleneamino]-3-oxo-6-methyl-2,3,4,5-tetrahydro-1,2,4-triazine, 4-[(pyrid-3-yl)-methyleneamino]-3-oxo-6-cyclopropyl-2,3,4,5-tetrahydro-I,2,4-triazine, 4-[(pyrid-3-yl)-methylamino]-3-oxo-6-isopropyl-2,3,4,5-tetra-hydro-1,2,4-triazine and 4-[(pyrid-3-yl)-methylamino]-3-oxo-6-tert.-butyl-2,3,4,5-tetra-hydro-1,2,4-triazine. Such pesticidal compounds, their preparation and use are described in EP Patent Application 314,615.
The process according to the invention can be illustrated by the following reaction scheme, the radicals R and Rt being as defined above:
~8 Rt O + HzN-NH2 ~ H20 --a o expansion (11) e~~i~~~.~~
R ~ 'N-NH-CO--Rt (III) N~ ~O
H
to hydrolysis, preferably acid hydrolysis.
The present process is preferably used for the preparation of compounds of formula I
wherein R is methyl, ethyl, isopropyl, tert.-butyl or cyclopropyl. The process is preferably carried out using compounds of formula II wherein Rt is Ct-C4alkyl as starting materials.
The aminotriazine derivatives of formula I prepared according to the invention can be used as intermediates for the preparation of 4-((pyrid-3-yl)-methyleneamino]-or 4-[(pyrid-3-yl)-methylamino]-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines, which are distinguished by pronounced insecticidal and acaricidal activity. Such pesticidal compounds are, for example, 4-[(pyrid-3-ylj-methyleneamino]-3-oxo-6-methyl-2,3,4,5-tetrahydro-1,2,4-triazine, 4-[(pyrid-3-yl)-methyleneamino]-3-oxo-6-cyclopropyl-2,3,4,5-tetrahydro-I,2,4-triazine, 4-[(pyrid-3-yl)-methylamino]-3-oxo-6-isopropyl-2,3,4,5-tetra-hydro-1,2,4-triazine and 4-[(pyrid-3-yl)-methylamino]-3-oxo-6-tert.-butyl-2,3,4,5-tetra-hydro-1,2,4-triazine. Such pesticidal compounds, their preparation and use are described in EP Patent Application 314,615.
The process according to the invention can be illustrated by the following reaction scheme, the radicals R and Rt being as defined above:
~8 Rt O + HzN-NH2 ~ H20 --a o expansion (11) e~~i~~~.~~
H H arid H H
hydrolysis R ~ ~N-NH-CO-Rl ---~ R ~ ~N-NH2 + Rl-COOH
N~ ~O N~ ~O
N N
H H
(III) (I) The first step (ring expansion) of the process according to the invention for the preparation of the compounds of formula I is usually carried out under normal pressure and preferably in a solvent. The temperature is from +15 to 120°C, preferably from +20 to 100°C.
Suitable solvents are, for example, water, nitrites, such as acetonitrile, alcohols, dioxane or tetrahydrofuran. The subsequent hydrolysis of the acylamino compounds of formula III to form the free amino compounds of formula I is preferably carried out with inorganic acids, such as 1N hydrochloric acid to conc. hydrochloric acid or 1N to lON sulfuric acid, at temperatures of from 0 to 120°C, especially from +20 to 100°C, in an aqueous medium or in organic solvents, such as alcohols, dioxane, tetrahydrofuran, nitrites, etc..
The 1,3,4-oxadiazolon-3-yl-ketones of formula II used as starting materials according to the invention are novel. They can be prepared analogously to known procedures, for example as follows (see, for example, EP Patent Application No. 314,615):
N NH O
I I
R t-°-~ ~ O + X - CH2- C - R ---~ II
O
(IV) (V) In the above formulae IV and V, R and R1 are as defined above and X is a halogen atom, preferably chlorine or bromine. The above process for the preparation of the oxadiazolone ketones of formula II is generally carried out under normal pressure in the presence of a base and in a solvent. The temperature is from 0 to +150°C, preferably from +20 to 100°C. Suitable bases are organic and inorganic bases, for example trimethylamine, alcoholates, sodium hydroxide or sodium hydride. Suitable solvents are, inter alia, alcohols, halogenated hydrocarbons, for example chloroform, nitrites, for example acetonitrile, tetrahydrofuran, dioxane, dimethyl sulfoxide, dimethylformamide or water.
hydrolysis R ~ ~N-NH-CO-Rl ---~ R ~ ~N-NH2 + Rl-COOH
N~ ~O N~ ~O
N N
H H
(III) (I) The first step (ring expansion) of the process according to the invention for the preparation of the compounds of formula I is usually carried out under normal pressure and preferably in a solvent. The temperature is from +15 to 120°C, preferably from +20 to 100°C.
Suitable solvents are, for example, water, nitrites, such as acetonitrile, alcohols, dioxane or tetrahydrofuran. The subsequent hydrolysis of the acylamino compounds of formula III to form the free amino compounds of formula I is preferably carried out with inorganic acids, such as 1N hydrochloric acid to conc. hydrochloric acid or 1N to lON sulfuric acid, at temperatures of from 0 to 120°C, especially from +20 to 100°C, in an aqueous medium or in organic solvents, such as alcohols, dioxane, tetrahydrofuran, nitrites, etc..
The 1,3,4-oxadiazolon-3-yl-ketones of formula II used as starting materials according to the invention are novel. They can be prepared analogously to known procedures, for example as follows (see, for example, EP Patent Application No. 314,615):
N NH O
I I
R t-°-~ ~ O + X - CH2- C - R ---~ II
O
(IV) (V) In the above formulae IV and V, R and R1 are as defined above and X is a halogen atom, preferably chlorine or bromine. The above process for the preparation of the oxadiazolone ketones of formula II is generally carried out under normal pressure in the presence of a base and in a solvent. The temperature is from 0 to +150°C, preferably from +20 to 100°C. Suitable bases are organic and inorganic bases, for example trimethylamine, alcoholates, sodium hydroxide or sodium hydride. Suitable solvents are, inter alia, alcohols, halogenated hydrocarbons, for example chloroform, nitrites, for example acetonitrile, tetrahydrofuran, dioxane, dimethyl sulfoxide, dimethylformamide or water.
The oxadiazolones of formula IV [see EP Patent Application No. 321,833; J. Pharm. Soc. Japan 76, 1300-1303 (1956); B. 82, 121-123 (1949)] and their preparation, and also the haloketones of formula V, are for the most part known.
It is known from Liebigs Ann. Chem. 749, 125 ff.
(1971) that 4-amino-6-phenyl-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines can be obtained starting from 2-amino-5-methyl-3-phenacyl-1,3,4-oxadiazolium bromide by reaction with hydrazine hydrate. The main disadvantage of this process is that it is limited to the preparation of 1,2,4-triazine rings that are phenyl-substituted in the 6-position; in addition, this process comprises several steps and its yield is poor. Furthermore, it is known from EP Patent Application No. 314,615 to prepare 4-amino-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines that are substituted in the 6-positon, by reacting corresponding 5-trifluoromethyl-1,3,4-oxadiazolon-3-yl-ketones with excess hydrazine in a one-step reaction:
N N-CHZ-CO-A H H
CF3--~O~O + H2N-NH2 -; A I N-NH2 N ~
~ N~O
I
H
(II) (Ia) wherein A may be an unsubstituted or substituted alkyl or aryl substituent. The disadvantages of this process are primarily the high cost of the trifluoroacetic acid ethyl ester required for preparing the trifluoroacethydrazide, the instability of that trifluoroacethydrazide at room temperature, and the not very high yield in the reaction of the trifluoroacethydrazide with phosgene in water (see Helv. Chim. Acta 1986, 333) to prepare the 5-trifluoromethyl-1,3,4-oxadiazol-2(3H)-one from 4a which the 5-trifluoromethyl-1,3,4-oxadiazolon-3-yl-ketones of formula IIa above (starting compound) are obtained. Moreover, the reaction according to EP Patent Application No. 314,615 inevitably produces toxic trifluoroacetic acid derivatives as a by-product, which present ecological problems and require a considerable outlay for their disposal.
In contrast, within the scope of the present invention it has now surprisingly been found that the presence of a 5-CF3 group in the starting compounds of formula II is not necessary for the preparation of the 4-amino-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines of formula I by ~0'~98~8 ring expansion. The present starting compounds of formula II, which contain one of the mentioned radicals Rt in the 5-position instead of the mentioned CF3 group, react readily with hydrazine hydrate to form the acylamino compounds of formula III, from which, however, the radical -CO-R1 must subsequently be removed by acid hydrolysis to obtain the compounds of formula I. With the process according to the invention, the disadvantages of the procedures hitherto available are eliminated since, in the process according to the invention, inexpensive and readily available starting compounds can be used, high yields are obtained and, instead of toxic trifluoroacetic acid derivatives, ecologically harmless carboxylic acid derivatives, for example acetic acid, are formed as a by-product. , Example 1: Preparation of the starting compound 2,3-Dihydro-5-methyl-2-oxo-1,3,4-oxadiazole-3-acetone g of 2,3-dihydro-5-methyl-2-oxo-1,3,4-oxadiazole (prepared in customary manner from acethydrazide and phosgene) are added to a solution of 2.3 g of sodium in 100 ml of methanol, the mixture is stirred for a short time and then the solvent is removed in vacuo at a bath temperature of 60°C. The sodium salt so formed is introduced in portions into a solution of 9.2 g of chloroacetone and 0.2 g of tetrabutylammonium bromide in 50 ml of chloroform, and the reaction mixture is stirred for 4 hours at 65°C.
After the salts have been filtered off, the solvent is removed in vacuo at a bath temperature of 50°C. The residue that remains is recrystallised from tert.-butyl methyl ether, yielding the title compound having a melting point of 55-57°C.
The following compounds of formula II are also prepared in a manner corresponding to that described above:
~~29~3~
It is known from Liebigs Ann. Chem. 749, 125 ff.
(1971) that 4-amino-6-phenyl-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines can be obtained starting from 2-amino-5-methyl-3-phenacyl-1,3,4-oxadiazolium bromide by reaction with hydrazine hydrate. The main disadvantage of this process is that it is limited to the preparation of 1,2,4-triazine rings that are phenyl-substituted in the 6-position; in addition, this process comprises several steps and its yield is poor. Furthermore, it is known from EP Patent Application No. 314,615 to prepare 4-amino-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines that are substituted in the 6-positon, by reacting corresponding 5-trifluoromethyl-1,3,4-oxadiazolon-3-yl-ketones with excess hydrazine in a one-step reaction:
N N-CHZ-CO-A H H
CF3--~O~O + H2N-NH2 -; A I N-NH2 N ~
~ N~O
I
H
(II) (Ia) wherein A may be an unsubstituted or substituted alkyl or aryl substituent. The disadvantages of this process are primarily the high cost of the trifluoroacetic acid ethyl ester required for preparing the trifluoroacethydrazide, the instability of that trifluoroacethydrazide at room temperature, and the not very high yield in the reaction of the trifluoroacethydrazide with phosgene in water (see Helv. Chim. Acta 1986, 333) to prepare the 5-trifluoromethyl-1,3,4-oxadiazol-2(3H)-one from 4a which the 5-trifluoromethyl-1,3,4-oxadiazolon-3-yl-ketones of formula IIa above (starting compound) are obtained. Moreover, the reaction according to EP Patent Application No. 314,615 inevitably produces toxic trifluoroacetic acid derivatives as a by-product, which present ecological problems and require a considerable outlay for their disposal.
In contrast, within the scope of the present invention it has now surprisingly been found that the presence of a 5-CF3 group in the starting compounds of formula II is not necessary for the preparation of the 4-amino-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazines of formula I by ~0'~98~8 ring expansion. The present starting compounds of formula II, which contain one of the mentioned radicals Rt in the 5-position instead of the mentioned CF3 group, react readily with hydrazine hydrate to form the acylamino compounds of formula III, from which, however, the radical -CO-R1 must subsequently be removed by acid hydrolysis to obtain the compounds of formula I. With the process according to the invention, the disadvantages of the procedures hitherto available are eliminated since, in the process according to the invention, inexpensive and readily available starting compounds can be used, high yields are obtained and, instead of toxic trifluoroacetic acid derivatives, ecologically harmless carboxylic acid derivatives, for example acetic acid, are formed as a by-product. , Example 1: Preparation of the starting compound 2,3-Dihydro-5-methyl-2-oxo-1,3,4-oxadiazole-3-acetone g of 2,3-dihydro-5-methyl-2-oxo-1,3,4-oxadiazole (prepared in customary manner from acethydrazide and phosgene) are added to a solution of 2.3 g of sodium in 100 ml of methanol, the mixture is stirred for a short time and then the solvent is removed in vacuo at a bath temperature of 60°C. The sodium salt so formed is introduced in portions into a solution of 9.2 g of chloroacetone and 0.2 g of tetrabutylammonium bromide in 50 ml of chloroform, and the reaction mixture is stirred for 4 hours at 65°C.
After the salts have been filtered off, the solvent is removed in vacuo at a bath temperature of 50°C. The residue that remains is recrystallised from tert.-butyl methyl ether, yielding the title compound having a melting point of 55-57°C.
The following compounds of formula II are also prepared in a manner corresponding to that described above:
~~29~3~
Rt R phys. data H -CH3 b.p. 0.08 torr/80°C
-CH3 -CH3 m.p. 55-58°C
-C(CH3)3 -CH3 b.p. 0.07 torr/102°C
02N / \ -CH3 m.p. 179-181°C
NOZ
-CH3 m.p. 98-102°C
-CI-I3 m.p. 126-129°C
-CH3 m.p. 116-118°C
~2N / \ -CH3 m.p. 164-168°C
-CH3 m.p. 146-148°C
N
~o~~a~a Example 2:
a) Preparation of 4-acetylamino-6-methyl-3-oxo-2 3 4 5-tetrahydro-1,2,4-triazine (ring expansion):
3.12 g of the 2,3-dihydro-5-methyl-2-oxo-1,3,4-oxadiazole-3-acetone prepared according to Example 1 are stirred in 40 ml of alcohol together with 2 g of hydrazine hydrate for 16 hours at a bath temperature of 35°C. After the solvent and the excess hydrazine have been evaporated off in vacuo, recrystallisation from isopropanol yields the title compound having a melting point of 197-199°C.
The following compounds of formula III are also prepared in a manner corresponding to that described above:
20~98~~
_g_ R1 R m.p. [°CJ
H -CH3 185-187°
-CH3 -CH3 197-199°
-C(CH3)3 -CH3 205-207°
O2N ~ ~ -CH3 252-255°
-CH3 255-257°
-CH3 228-231°
-CH3 259-262°
OZN
-CH3 259-262°
N
H H
~~2':3f3 b) Preparation of 4-amino-6-methyl-3-oxo-2 3 4 5-te~ahvdro-1 2 4-triazine (acid h~ysis):
1.7 g of the 4-acetylamino-6-methyl-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazine prepared according to a) above are stirred for 5 hours in 10 ml of 2N hydrochloric acid at 80°C.
After cooling of the solution, 1.7 g of sodium acetate are added and the solution is concentrated by evaporation in a rotary evaporator at a bath temperature of 60°C. The residue formed is stirred with ethanol and freed of salt precipitates by filtration. The resulting solution is concentrated to a small volume and caused to crystallise. The title compound is obtained in the form of colourless crystals having a melting point of 116-119°C.
The following compounds of formula I are also prepared in a manner corresponding to that described above:
R m.p. [°Cl -CH3 I 16-119°
-C2H5 143-145°
-C3I-h(i) 79- 81°
-C(CH3)3 148-150°
94- 95°
199-202°
ct 208-210°
H
-CF3 .,
-CH3 -CH3 m.p. 55-58°C
-C(CH3)3 -CH3 b.p. 0.07 torr/102°C
02N / \ -CH3 m.p. 179-181°C
NOZ
-CH3 m.p. 98-102°C
-CI-I3 m.p. 126-129°C
-CH3 m.p. 116-118°C
~2N / \ -CH3 m.p. 164-168°C
-CH3 m.p. 146-148°C
N
~o~~a~a Example 2:
a) Preparation of 4-acetylamino-6-methyl-3-oxo-2 3 4 5-tetrahydro-1,2,4-triazine (ring expansion):
3.12 g of the 2,3-dihydro-5-methyl-2-oxo-1,3,4-oxadiazole-3-acetone prepared according to Example 1 are stirred in 40 ml of alcohol together with 2 g of hydrazine hydrate for 16 hours at a bath temperature of 35°C. After the solvent and the excess hydrazine have been evaporated off in vacuo, recrystallisation from isopropanol yields the title compound having a melting point of 197-199°C.
The following compounds of formula III are also prepared in a manner corresponding to that described above:
20~98~~
_g_ R1 R m.p. [°CJ
H -CH3 185-187°
-CH3 -CH3 197-199°
-C(CH3)3 -CH3 205-207°
O2N ~ ~ -CH3 252-255°
-CH3 255-257°
-CH3 228-231°
-CH3 259-262°
OZN
-CH3 259-262°
N
H H
~~2':3f3 b) Preparation of 4-amino-6-methyl-3-oxo-2 3 4 5-te~ahvdro-1 2 4-triazine (acid h~ysis):
1.7 g of the 4-acetylamino-6-methyl-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazine prepared according to a) above are stirred for 5 hours in 10 ml of 2N hydrochloric acid at 80°C.
After cooling of the solution, 1.7 g of sodium acetate are added and the solution is concentrated by evaporation in a rotary evaporator at a bath temperature of 60°C. The residue formed is stirred with ethanol and freed of salt precipitates by filtration. The resulting solution is concentrated to a small volume and caused to crystallise. The title compound is obtained in the form of colourless crystals having a melting point of 116-119°C.
The following compounds of formula I are also prepared in a manner corresponding to that described above:
R m.p. [°Cl -CH3 I 16-119°
-C2H5 143-145°
-C3I-h(i) 79- 81°
-C(CH3)3 148-150°
94- 95°
199-202°
ct 208-210°
H
-CF3 .,
Claims (6)
1. A process for the preparation of a compound of formula I
wherein R is hydrogen, C1-C6alkyl, C3-C6cycloalkyl, C1-C4alkyl substituted by from 1 to 10 halogen atoms or by from 1 to 3 radicals from the group C1-C3alkoxy, C1-C3alkylthio and phenyl, phenyl or phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, which process comprises reacting with hydrazine hydrate a compound of formula II
wherein R1 is hydrogen, C1-C4alkyl, C3-C6cycloalkyl, C1-C4alkyl substituted by from 1 to 9 chlorine atoms, C1-C3alkoxy, C1-C3alkylthio, C1-C3alkylsulfinyl, C1-C3alkylsulfonyl, phenyl, phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, or pyridyl; and R is as defined above; and subjecting the resulting compound of formula III
to hydrolysis.
wherein R is hydrogen, C1-C6alkyl, C3-C6cycloalkyl, C1-C4alkyl substituted by from 1 to 10 halogen atoms or by from 1 to 3 radicals from the group C1-C3alkoxy, C1-C3alkylthio and phenyl, phenyl or phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, which process comprises reacting with hydrazine hydrate a compound of formula II
wherein R1 is hydrogen, C1-C4alkyl, C3-C6cycloalkyl, C1-C4alkyl substituted by from 1 to 9 chlorine atoms, C1-C3alkoxy, C1-C3alkylthio, C1-C3alkylsulfinyl, C1-C3alkylsulfonyl, phenyl, phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, or pyridyl; and R is as defined above; and subjecting the resulting compound of formula III
to hydrolysis.
2. A process according to claim 1, wherein the compound of formula III is subjected to acid hydrolysis.
3. A process according to claim 1 or 2, wherein the compound of formula III is subjected to hydrolysis with an inorganic acid.
4. A process according to any one of claims 1 to 3, wherein R is methyl, ethyl, isopropyl, tert.-butyl or cyclopropyl.
5. A process according to any one of claims 1 to 4, wherein R1 is C1-C4alkyl.
6. A compound of formula wherein R is hydrogen, C1-C6alkyl, C3-C6cycloalkyl, C1-C4alkyl substituted by from 1 to 10 halogen atoms or by from 1 to 3 radicals from the group C1-C3alkoxy, C1-C3alkylthio and phenyl, phenyl or phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro;
and R1 is hydrogen, C1-C4alkyl , C3-C6cycloalkyl , C1-C4alkyl substituted by from 1 to 9 chlorine atoms, C1-C3alkoxy, C1-C3alkylthio, C1-C3alkylsulfinyl, C1-C3alkylsulfonyl, phenyl, phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, or pyridyl;
with the proviso that when R is unsubstituted phenyl, R1 is other than methyl, n-butyl or phenyl.
and R1 is hydrogen, C1-C4alkyl , C3-C6cycloalkyl , C1-C4alkyl substituted by from 1 to 9 chlorine atoms, C1-C3alkoxy, C1-C3alkylthio, C1-C3alkylsulfinyl, C1-C3alkylsulfonyl, phenyl, phenyl substituted by from 1 to 3 radicals from the group halogen, methyl, ethyl, methoxy, methylthio and nitro, or pyridyl;
with the proviso that when R is unsubstituted phenyl, R1 is other than methyl, n-butyl or phenyl.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002320676A CA2320676C (en) | 1989-11-15 | 1990-11-13 | Process and intermediates for the preparation of aminotriazine derivatives |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH410789 | 1989-11-15 | ||
| CH4107/89-7 | 1989-11-15 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002320676A Division CA2320676C (en) | 1989-11-15 | 1990-11-13 | Process and intermediates for the preparation of aminotriazine derivatives |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2029838A1 CA2029838A1 (en) | 1991-05-16 |
| CA2029838C true CA2029838C (en) | 2001-06-19 |
Family
ID=4269949
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002320676A Expired - Lifetime CA2320676C (en) | 1989-11-15 | 1990-11-13 | Process and intermediates for the preparation of aminotriazine derivatives |
| CA002029838A Expired - Lifetime CA2029838C (en) | 1989-11-15 | 1990-11-13 | Process for the preparation of aminotriazine derivatives |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002320676A Expired - Lifetime CA2320676C (en) | 1989-11-15 | 1990-11-13 | Process and intermediates for the preparation of aminotriazine derivatives |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0433218B1 (en) |
| JP (1) | JP2943010B2 (en) |
| KR (1) | KR0150208B1 (en) |
| CA (2) | CA2320676C (en) |
| DE (1) | DE59010496D1 (en) |
| DK (1) | DK0433218T3 (en) |
| ES (1) | ES2091815T3 (en) |
| GR (1) | GR3020992T3 (en) |
| IE (1) | IE73669B1 (en) |
| IL (3) | IL111617A (en) |
| PT (1) | PT95888B (en) |
| SG (1) | SG43813A1 (en) |
| TW (1) | TW199149B (en) |
| ZA (1) | ZA909120B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9304178D0 (en) * | 1993-03-02 | 1993-04-21 | Ciba Geigy Ag | Process for the preparation of 6-alkyl-4-(pyridin-3-yl-methyleneamino),5-dihydro-1,2,4-triazin-3(2h)-one |
| US5384403A (en) * | 1993-03-31 | 1995-01-24 | Ciba-Geigy Corporation | Process for the preparation of aminotriazine derivatives |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5416515B1 (en) * | 1968-08-19 | 1979-06-22 | ||
| JPS6011478A (en) * | 1983-06-30 | 1985-01-21 | Showa Denko Kk | Oxadiazolinon derivative and herbicide |
| US4699647A (en) * | 1985-05-30 | 1987-10-13 | E. I. Du Pont De Nemours And Company | Herbicidal sulfonamides |
| DE3853662D1 (en) * | 1987-10-16 | 1995-06-01 | Ciba Geigy Ag | Pesticides. |
-
1990
- 1990-10-24 TW TW079108994A patent/TW199149B/zh active
- 1990-11-06 EP EP90810853A patent/EP0433218B1/en not_active Expired - Lifetime
- 1990-11-06 DE DE59010496T patent/DE59010496D1/en not_active Expired - Lifetime
- 1990-11-06 ES ES90810853T patent/ES2091815T3/en not_active Expired - Lifetime
- 1990-11-06 DK DK90810853.3T patent/DK0433218T3/en not_active Application Discontinuation
- 1990-11-06 SG SG1996001138A patent/SG43813A1/en unknown
- 1990-11-08 IL IL11161790A patent/IL111617A/en not_active IP Right Cessation
- 1990-11-08 IL IL9628090A patent/IL96280A/en not_active IP Right Cessation
- 1990-11-13 CA CA002320676A patent/CA2320676C/en not_active Expired - Lifetime
- 1990-11-13 CA CA002029838A patent/CA2029838C/en not_active Expired - Lifetime
- 1990-11-14 KR KR1019900018447A patent/KR0150208B1/en not_active IP Right Cessation
- 1990-11-14 PT PT95888A patent/PT95888B/en not_active IP Right Cessation
- 1990-11-14 IE IE411390A patent/IE73669B1/en not_active IP Right Cessation
- 1990-11-14 ZA ZA909120A patent/ZA909120B/en unknown
- 1990-11-15 JP JP2310158A patent/JP2943010B2/en not_active Expired - Lifetime
-
1994
- 1994-11-14 IL IL11161794A patent/IL111617A0/en unknown
-
1996
- 1996-09-12 GR GR960402339T patent/GR3020992T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| KR0150208B1 (en) | 1998-10-15 |
| PT95888A (en) | 1991-09-13 |
| IL111617A0 (en) | 1995-01-24 |
| IL96280A0 (en) | 1991-08-16 |
| DE59010496D1 (en) | 1996-10-17 |
| PT95888B (en) | 1997-11-28 |
| ZA909120B (en) | 1991-07-31 |
| IE73669B1 (en) | 1997-07-02 |
| IE904113A1 (en) | 1991-05-22 |
| EP0433218B1 (en) | 1996-09-11 |
| ES2091815T3 (en) | 1996-11-16 |
| CA2029838A1 (en) | 1991-05-16 |
| DK0433218T3 (en) | 1996-09-30 |
| TW199149B (en) | 1993-02-01 |
| CA2320676A1 (en) | 1991-05-16 |
| EP0433218A1 (en) | 1991-06-19 |
| IL111617A (en) | 1996-05-14 |
| KR910009677A (en) | 1991-06-28 |
| SG43813A1 (en) | 1997-11-14 |
| JPH03188070A (en) | 1991-08-16 |
| JP2943010B2 (en) | 1999-08-30 |
| IL96280A (en) | 1996-01-31 |
| GR3020992T3 (en) | 1996-12-31 |
| CA2320676C (en) | 2004-11-02 |
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