CH361004A - Process for the production of new dioxo-tetrahydropyridazines - Google Patents
Process for the production of new dioxo-tetrahydropyridazinesInfo
- Publication number
- CH361004A CH361004A CH361004DA CH361004A CH 361004 A CH361004 A CH 361004A CH 361004D A CH361004D A CH 361004DA CH 361004 A CH361004 A CH 361004A
- Authority
- CH
- Switzerland
- Prior art keywords
- dioxo
- tetrahydropyridazines
- lower aliphatic
- phenyl
- tetrahydropyridazine
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 8
- OFUIFLZWMQEMFY-UHFFFAOYSA-N 1,2-dihydropyridazine-3,4-dione Chemical class O=C1C=CNNC1=O OFUIFLZWMQEMFY-UHFFFAOYSA-N 0.000 title description 2
- 238000004519 manufacturing process Methods 0.000 title description 2
- -1 aliphatic alcohols Chemical class 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 5
- 150000003469 sulfuric acid diesters Chemical class 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- VAYGXNSJCAHWJZ-UHFFFAOYSA-N dimethyl sulfate Chemical compound COS(=O)(=O)OC VAYGXNSJCAHWJZ-UHFFFAOYSA-N 0.000 claims description 3
- JQIZHNLEFQMDCQ-UHFFFAOYSA-N 1,2,3,4-tetrahydropyridazine Chemical class C1CC=CNN1 JQIZHNLEFQMDCQ-UHFFFAOYSA-N 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims 1
- 125000001931 aliphatic group Chemical group 0.000 claims 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 claims 1
- 239000000243 solution Substances 0.000 description 7
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 125000005843 halogen group Chemical group 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical class [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 150000005840 aryl radicals Chemical class 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 239000000543 intermediate Substances 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 2
- SBWKBNKXHUDGQP-UHFFFAOYSA-N 2-bromo-1H-pyridazine-3,6-dione Chemical compound BrN1NC(C=CC1=O)=O SBWKBNKXHUDGQP-UHFFFAOYSA-N 0.000 description 1
- SCWUCDCRYFOBFY-UHFFFAOYSA-N 4-bromo-1-methyl-2-(4-methylphenyl)pyridazine-3,6-dione Chemical compound C1=CC(C)=CC=C1N1C(=O)C(Br)=CC(=O)N1C SCWUCDCRYFOBFY-UHFFFAOYSA-N 0.000 description 1
- IMJZFBAHVAVALN-UHFFFAOYSA-N 4-bromo-1-methyl-2-(4-nitrophenyl)pyridazine-3,6-dione Chemical compound [N+](=O)([O-])C1=CC=C(C=C1)N1N(C(C=C(C1=O)Br)=O)C IMJZFBAHVAVALN-UHFFFAOYSA-N 0.000 description 1
- SUXONOLVNDAWRS-UHFFFAOYSA-N 4-bromo-1-methyl-2-phenylpyridazine-3,6-dione Chemical compound O=C1C(Br)=CC(=O)N(C)N1C1=CC=CC=C1 SUXONOLVNDAWRS-UHFFFAOYSA-N 0.000 description 1
- MVMQALHNLWFXAL-UHFFFAOYSA-N 4-bromo-2-(3-chlorophenyl)-1-methylpyridazine-3,6-dione Chemical compound ClC=1C=C(C=CC=1)N1N(C(C=C(C1=O)Br)=O)C MVMQALHNLWFXAL-UHFFFAOYSA-N 0.000 description 1
- CNCRFCSTWOMCOP-UHFFFAOYSA-N 4-chloro-2-methyl-1-phenylpyridazine-3,6-dione Chemical compound C1(=CC=CC=C1)N1N(C(C(=CC1=O)Cl)=O)C CNCRFCSTWOMCOP-UHFFFAOYSA-N 0.000 description 1
- YCPIRMGJYIWVBI-UHFFFAOYSA-N 4-chloro-2-phenyl-1h-pyridazine-3,6-dione Chemical compound O=C1C(Cl)=CC(=O)NN1C1=CC=CC=C1 YCPIRMGJYIWVBI-UHFFFAOYSA-N 0.000 description 1
- ODPNBRBOAQEHKP-UHFFFAOYSA-N 5-chloro-2-phenyl-1h-pyridazine-3,6-dione Chemical compound N1C(=O)C(Cl)=CC(=O)N1C1=CC=CC=C1 ODPNBRBOAQEHKP-UHFFFAOYSA-N 0.000 description 1
- BIKZMGYDQFTKSX-UHFFFAOYSA-N C(C1=CC=C(C=C1)OC)N1N(C(C=C(C1=O)Br)=O)C Chemical compound C(C1=CC=C(C=C1)OC)N1N(C(C=C(C1=O)Br)=O)C BIKZMGYDQFTKSX-UHFFFAOYSA-N 0.000 description 1
- SHVXPIWZGNFGSC-UHFFFAOYSA-N C1(=CC=C(C=C1)N1N(C(C=C(C1=O)Br)=O)CC)C Chemical compound C1(=CC=C(C=C1)N1N(C(C=C(C1=O)Br)=O)CC)C SHVXPIWZGNFGSC-UHFFFAOYSA-N 0.000 description 1
- PXUFHLHZKGENGM-UHFFFAOYSA-N C1(=CC=CC=C1)N1N(C(C=C(C1=O)Br)=O)CC Chemical compound C1(=CC=CC=C1)N1N(C(C=C(C1=O)Br)=O)CC PXUFHLHZKGENGM-UHFFFAOYSA-N 0.000 description 1
- IGVNDUISQQFABX-UHFFFAOYSA-N CN(C(C=C1Br)=O)N(C(C=C2)=CC=C2Cl)C1=O Chemical compound CN(C(C=C1Br)=O)N(C(C=C2)=CC=C2Cl)C1=O IGVNDUISQQFABX-UHFFFAOYSA-N 0.000 description 1
- BGRDGMRNKXEXQD-UHFFFAOYSA-N Maleic hydrazide Chemical class OC1=CC=C(O)N=N1 BGRDGMRNKXEXQD-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- CIUQDSCDWFSTQR-UHFFFAOYSA-N [C]1=CC=CC=C1 Chemical compound [C]1=CC=CC=C1 CIUQDSCDWFSTQR-UHFFFAOYSA-N 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000000202 analgesic effect Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000000843 anti-fungal effect Effects 0.000 description 1
- 230000001754 anti-pyretic effect Effects 0.000 description 1
- 239000002221 antipyretic Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000002026 chloroform extract Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- DENRZWYUOJLTMF-UHFFFAOYSA-N diethyl sulfate Chemical compound CCOS(=O)(=O)OCC DENRZWYUOJLTMF-UHFFFAOYSA-N 0.000 description 1
- 229940008406 diethyl sulfate Drugs 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 150000002367 halogens Chemical group 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 125000001820 oxy group Chemical group [*:1]O[*:2] 0.000 description 1
- 239000000825 pharmaceutical preparation Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- MYKHANQTTIRZJK-UHFFFAOYSA-N pyridazine-3,4-dione Chemical class O=C1C=CN=NC1=O MYKHANQTTIRZJK-UHFFFAOYSA-N 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000004799 sedative–hypnotic effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 230000000699 topical effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
- C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
- C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D237/14—Oxygen atoms
- C07D237/16—Two oxygen atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Plural Heterocyclic Compounds (AREA)
Description
Verfahren zur Herstellung neuer Dioxo-tetrahydropyridazine Gegenstand der Erfindung ist ein Verfahren zur Herstellung von 1-Aryl-4- oder -5-halogen-3,6-dioxo- 1,2,3,6-tetrahydro-pyridazinen, die in 2-Stellung einen niederen aliphatischen Kohlenwasserstoffrest tragen, das dadurch gekennzeichnet ist, dass man ent sprechende 2-unsubstituierte Tetrahydropyridazine mit niedere aliphatische Kohlenwasserstoffreste ab gebenden Mitteln behandelt.
Als Arylreste kommen insbesondere zweikernige aromatische Reste, vor zugsweise Phenyl, die auch Substituenten, wie z. B. niedere Alkyl- oder Alkoxygruppen, Halogenatome, Nitro- oder Aminogruppen aufweisen können, in Be tracht. Als niedere aliphatische Kohlenwasserstoff reste sind besonders niedere Alkylreste wie Methyl oder Äthyl zu erwähnen. Als Halogenatome kommen in erster Linie Chlor und Brom in Frage.
Die erfindungsgemäss erhältlichen neuen Verbin dungen sind analgetisch wirksam und besitzen eine antibakterielle und Antifungus-Wirkung. Sie können dementsprechend als Medikamente oder Desinfek tionsmittel verwendet werden. In erster Linie stellen sie jedoch wichtige Zwischenprodukte für die Her stellung von 1-Aryl-3,6-dioxo-1,2,3,6-tetrahydro- pyridazinen dar, die in 2-Stellung einen niederen ali- phatischen Kohlenwasserstoffrest und in 4-Stellung eine Aminogruppe tragen.
Die Herstellung dieser antipyretischen und sedativ-hypnotischen 4-Amino- Verbindungen durch Behandlung der genannten Halogenverbindungen mit Ammoniak oder Aminen ist Gegenstand des schweizerischen Patentes Num mer 356464.
Besonders wertvoll sind Dioxopyridazine der Formel
EMI0001.0039
worin R für Methyl oder Äthyl steht, einer der Reste R1 und R2 Wasserstoff und der andere Halogen, z. B. Chlor oder Brom, bedeutet und Ph einen Phenyl- rest darstellt, vor allem das 1-Phenyl-2-methyl-4- chlor- oder -brom-3,6-dioxo-1,2,3,6-tetrahydro-pyrid- azin, oder die entsprechende 2-Methyl-5-chlor- oder -brom-Verbindung.
Als niedere aliphatische Kohlenwasserstoffreste abgebende Mittel sind z. B. die entsprechenden Schwefelsäurediester geeignet. Zweckmässig werden die erfindungsgemäss erhaltenen 2-substituierten Pro dukte isoliert. Als Schwefelsäurediester kommen hauptsächlich Dimethyl- und Diäthylsulfat in Frage. Die Reaktion wird vorzugsweise bei erhöhter Tem peratur, z.
B. zwischen 100 und 200 C, in An- oder Abwesenheit von Verdünnungsmitteln, Kondensa tionsmitteln oder Katalysatoren, im offenen oder geschlossenen Gefäss unter Druck vorgenommen. Die Ausgangsstoffe können auch unter den Re aktionsbedingungen selbst erhalten werden.
So ist es möglich, zur Umsetzung mit den Schwefelsäure diestern an Stelle der 1-Aryl-3,6-dioxo-1,2,3,6- tetrahydropyridazine, die in 4- oder 5-Stellung ein Halogenatom enthalten, entsprechende 3-Enoläther oder -acylate (1-Aryl-6-oxo-1,6-dihydro-pyridazine, die in 3-Stellung eine verätherte oder veresterte Oxy- gruppe tragen) zu verwenden,
aus- denen unter den Reaktionsbedingungen jedenfalls intermediär die 2- unsubstituierten 3,6-Dioxo-1,2,3,6-tetrahydropyrid- azine entstehen.
In den erfindungsgemäss erhaltenen Verbindungen lassen sich unsubstituierte Arylreste substituieren, z. B. nitrieren. Weiter kann man in den erhaltenen Verbindungen mit Nitroarylresten in 1-Stellung die Nitrogruppe in üblicher Weise zur Aminogruppe reduzieren. Von den Aminoverbindungen lassen sich in an sich bekannter Weise Salze herstellen, z. B.
solche der Halogenwasserstoffsäuren, der Schwefel-, Phosphor-, Salpeter-, Essig-, Propion-, Oxal-, Wein- oder Äpfelsäure.
Die erfindungsgemäss erhaltenen neuen Halogen- dioxo-hydropyridazine können zur Herstellung von pharmazeutischen Präparaten Verwendung finden, welche sie in Mischung mit einem für die enterale, parenterale oder topicale Applikation geeigneten pharmazeutischen organischen oder anorganischen Trägermaterial enthalten.
In den folgenden Beispielen sind die Tempe raturen in Celsiusgraden angegeben.
<I>- Beispiel 1</I> 5 g 1-Phenyl-5-chlor-3,6-dioxo-1,2,3,6-tetrahydro- pyridazin werden mit 20 cm3 Dimethylsulfat 31/i Stunden auf 120 bis 130 erhitzt. Man kühlt die leicht braune Lösung ab und giesst sie auf eine ge sättigte Sodalösung (etwa 150 cm3). Nach zwei tägigem Stehen wird die alkalische Lösung mit Chloroform ausgeschüttelt. Die getrocknete Chloro- formlösung wird über Tierkohle filtriert und ein gedampft.
Der hellgelbe, kristallisierte Rückstand wird aus Methanol umkristallisiert. Man erhält so das 1--Phenyl-2-methyl-5-chlor-3,6-dioxot-1,2,3,6- tetrahydro-pyridazin der Formel
EMI0002.0050
in Form gelbweisser Kristalle vom F. 156 bis 157,5 .
In gleicher Weise erhält man: 1-Phenyl-2-äthyl-5-brom-3,6-dioxo-1,2,3,6- tetrahydro-pyridazin, F. 142 bis 144 ; 1-Phenyl-2-methyl-5-brom-3,6-dioxo-1,2,3,6- tetrahydro-pyridazin, F. 159 bis 161 ; 1-(p-Chlor-phenyl)-2-methyl-5-brom-3,6-dioxo- 1,2,3,6-tetrahydro-pyridazin, F. 158,5 bis 159 ; 1-(m-Chlor-phenyl)-2-methyl-5-brom-3, 6-dioxo- 1,2,3,6-tetrahydropyridazin, F. 169 bis 170 ; 1-(p-Tolyl)-2-methyl-5-brom-3,6-dioxo-1,2,3,6- tetrahydro-pyridazin, F. 170 bis 171 ;
1-(p-Nitro-phenyl)-2-methyl-5-brom-3,6-dioxo- 1,2,3,6-tetrahydro-pyridazin, F. 199 bis 201 ; 1-(p-Tolyl)-2-äthyl-5-brom-3,6-dioxo-1,2,3,6- tetrahydro-pyridazin, F. 168 bis l69 ; 1-(p-Anisyl)-2-methyl-5-brom-3,6-dioxo-1,2,3,6- tetrahydro-pyridazin, F. 155 bis 157 ; 1-(p-Nitro-phenyl)-2-methyl-4-brom-3, 6-dioxo- 1,2,3,6-tetrahydro-pyridazin, F. 216 bis 218 .
<I>Beispiel 2</I> 10 g 1-Phenyl-4-chlor-3,6-dioxo-1,2,3,6-tetra- hydropyridazin werden mit 25 cm- Dimethylsulfat 31/2 Stunden auf 140 bis 150 erhitzt. Man kühlt die braune Lösung ab und giesst sie auf 150 cm3 einer gesättigten Sodalösung und verdünnt mit 100 cm3 Wasser. Die Lösung wird einige Zeit ge rührt, dann mit Chloroform ausgeschüttelt. Der Chloroformauszug wird getrocknet und eingedampft. Der Rückstand wird in Benzol gelöst, die Lösung über Aluminiumoxyd filtriert und eingedampft. Den Rückstand kristallisiert man aus Essigester um.
Man erhält so das 1-Phenyl-2-methyl-4-chlor-3,6-dioxo- 1,2,3,6-tetrahydropyridazin der Formel
EMI0002.0082
in schwach gelben Kristallen vom F.<B>150</B> bis 152 .
Process for the preparation of new dioxo-tetrahydropyridazines The invention relates to a process for the preparation of 1-aryl-4- or -5-halogen-3,6-dioxo-1,2,3,6-tetrahydropyridazines, which are in 2- Position carry a lower aliphatic hydrocarbon radical, which is characterized in that corresponding 2-unsubstituted tetrahydropyridazines are treated with agents that release lower aliphatic hydrocarbon radicals.
As aryl radicals are in particular binuclear aromatic radicals, preferably phenyl, which also have substituents such as. B. may have lower alkyl or alkoxy groups, halogen atoms, nitro or amino groups, in Be tracht. Lower aliphatic hydrocarbon radicals are particularly lower alkyl radicals such as methyl or ethyl. Chlorine and bromine are primarily suitable as halogen atoms.
The novel compounds obtainable according to the invention are analgesic and have an antibacterial and antifungal effect. Accordingly, they can be used as medicines or disinfectants. However, they are primarily important intermediates for the preparation of 1-aryl-3,6-dioxo-1,2,3,6-tetrahydropyridazines, which are a lower aliphatic hydrocarbon radical in the 2-position and in 4 Position carry an amino group.
The preparation of these antipyretic and sedative-hypnotic 4-amino compounds by treating the halogen compounds mentioned with ammonia or amines is the subject of Swiss patent number 356464.
Dioxopyridazines of the formula are particularly valuable
EMI0001.0039
wherein R is methyl or ethyl, one of the radicals R1 and R2 is hydrogen and the other is halogen, e.g. B. chlorine or bromine, and Ph is a phenyl radical, especially 1-phenyl-2-methyl-4-chloro or bromo-3,6-dioxo-1,2,3,6-tetrahydro- pyridazine, or the corresponding 2-methyl-5-chloro or bromo compound.
As lower aliphatic hydrocarbon radicals donating agents are z. B. suitable the corresponding sulfuric acid diesters. The 2-substituted products obtained according to the invention are expediently isolated. The sulfuric acid diesters mainly used are dimethyl and diethyl sulfate. The reaction is preferably carried out at elevated temperature, e.g.
B. between 100 and 200 C, in the presence or absence of diluents, condensation agents or catalysts, made in an open or closed vessel under pressure. The starting materials can also be obtained under the reaction conditions themselves.
It is possible, for example, to react with the sulfuric acid diesters by using corresponding 3-enol ethers instead of the 1-aryl-3,6-dioxo-1,2,3,6-tetrahydropyridazines which contain a halogen atom in the 4- or 5-position or acylates (1-aryl-6-oxo-1,6-dihydro-pyridazines, which have an etherified or esterified oxy group in the 3-position),
from which, under the reaction conditions, the 2-unsubstituted 3,6-dioxo-1,2,3,6-tetrahydropyridazines are formed as intermediates.
In the compounds obtained according to the invention, unsubstituted aryl radicals can be substituted, e.g. B. nitrate. In addition, in the compounds obtained with nitroaryl radicals in the 1-position, the nitro group can be reduced to the amino group in the usual manner. The amino compounds can be used to prepare salts in a manner known per se, e.g. B.
those of the hydrohalic acids, sulfuric, phosphoric, nitric, acetic, propionic, oxalic, tartaric or malic acids.
The new halodioxohydropyridazines obtained according to the invention can be used for the production of pharmaceutical preparations which they contain as a mixture with a pharmaceutical, organic or inorganic carrier material suitable for enteral, parenteral or topical application.
In the following examples, the temperatures are given in degrees Celsius.
<I> - Example 1 </I> 5 g of 1-phenyl-5-chloro-3,6-dioxo-1,2,3,6-tetrahydropyridazine are mixed with 20 cm3 of dimethyl sulfate for 31½ hours to 120 to 130 hours heated. The slightly brown solution is cooled and poured onto a saturated soda solution (about 150 cm3). After standing for two days, the alkaline solution is extracted with chloroform. The dried chloroform solution is filtered through animal charcoal and evaporated.
The light yellow, crystallized residue is recrystallized from methanol. This gives 1-phenyl-2-methyl-5-chloro-3,6-dioxot-1,2,3,6-tetrahydropyridazine of the formula
EMI0002.0050
in the form of yellow-white crystals from F. 156 to 157.5.
The following are obtained in the same way: 1-phenyl-2-ethyl-5-bromo-3,6-dioxo-1,2,3,6-tetrahydropyridazine, mp 142 to 144; 1-phenyl-2-methyl-5-bromo-3,6-dioxo-1,2,3,6-tetrahydropyridazine, m.p. 159 to 161; 1- (p-chloro-phenyl) -2-methyl-5-bromo-3,6-dioxo-1,2,3,6-tetrahydropyridazine, m.p. 158.5 to 159; 1- (m-chloro-phenyl) -2-methyl-5-bromo-3, 6-dioxo-1,2,3,6-tetrahydropyridazine, m.p. 169 to 170; 1- (p-Tolyl) -2-methyl-5-bromo-3,6-dioxo-1,2,3,6-tetrahydropyridazine, m.p. 170 to 171;
1- (p-nitro-phenyl) -2-methyl-5-bromo-3,6-dioxo-1,2,3,6-tetrahydropyridazine, m.p. 199 to 201; 1- (p-Tolyl) -2-ethyl-5-bromo-3,6-dioxo-1,2,3,6-tetrahydropyridazine, mp 168 to 169; 1- (p-anisyl) -2-methyl-5-bromo-3,6-dioxo-1,2,3,6-tetrahydropyridazine, m.p. 155 to 157; 1- (p-Nitro-phenyl) -2-methyl-4-bromo-3, 6-dioxo-1,2,3,6-tetrahydropyridazine, m.p. 216-218.
<I> Example 2 </I> 10 g of 1-phenyl-4-chloro-3,6-dioxo-1,2,3,6-tetrahydropyridazine are mixed with 25 cm dimethyl sulfate for 31/2 hours to 140 to 150 heated. The brown solution is cooled and poured onto 150 cm3 of a saturated soda solution and diluted with 100 cm3 of water. The solution is stirred for some time, then extracted with chloroform. The chloroform extract is dried and evaporated. The residue is dissolved in benzene, the solution filtered through aluminum oxide and evaporated. The residue is recrystallized from ethyl acetate.
This gives 1-phenyl-2-methyl-4-chloro-3,6-dioxo-1,2,3,6-tetrahydropyridazine of the formula
EMI0002.0082
in pale yellow crystals from F. <B> 150 </B> to 152.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH361004T | 1957-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH361004A true CH361004A (en) | 1962-03-31 |
Family
ID=4512820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH361004D CH361004A (en) | 1957-05-23 | 1957-05-23 | Process for the production of new dioxo-tetrahydropyridazines |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH361004A (en) |
-
1957
- 1957-05-23 CH CH361004D patent/CH361004A/en unknown
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