CH312533A - Process for making a pyridazone. - Google Patents

Process for making a pyridazone.

Info

Publication number
CH312533A
CH312533A CH312533DA CH312533A CH 312533 A CH312533 A CH 312533A CH 312533D A CH312533D A CH 312533DA CH 312533 A CH312533 A CH 312533A
Authority
CH
Switzerland
Prior art keywords
pyridazon
phenyl
methyl
dimethylamine
pyridazone
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft Ciba
Original Assignee
Ciba Geigy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ciba Geigy filed Critical Ciba Geigy
Publication of CH312533A publication Critical patent/CH312533A/en

Links

Description

  

      Zierfahren        zur   <B>Herstellung eines</B>     Pyridazons.       Gegenstand des vorliegenden Patentes ist  ein Verfahren zur Herstellung von     6-Di-          metllylamino-2-phenyl-4    (oder 5)     -methyl-pyrid-          azon-(3)    der Formel  
EMI0001.0008     
    Die neue Verbindung wird erhalten, wenn  man     2-Phenyl-4(oder        5)-methyl-pyridazon-(3),          clas    in     6-Stellung    einen austauschfähigen     Sub-          stituenten    aufweist, mit.

       Dimethylamin    um  setzt. Ein austauschfähiger     Substituent    ist  zum Beispiel ein Halogen-, insbesondere ein  Chloratom, oder auch eine substituierte     Oxy-,     wie     Phenoxy-,    oder     Mereapto-,    wie     Metliyjmer-          captogruppe.     



  Die Reaktion kann in An- oder Abwesen  heit von Verdünnungsmitteln     und/oder    Kon  densationsmitteln     undfoder    Katalysatoren im       offenen    oder geschlossenen Gefäss unter Druck  durchgeführt werden.  



  Das Verfahrensprodukt, das     6-Dimethyl-          ainino-2-pheilyl-4(oder        5)-methyl-pyridazon-          (3)    vom F. = 91-92 , ist neu. Es zeigt eine       antipyretische    und     analgetisehe    Wirkung und  soll als Heilmittel Verwendung finden.    Die Erfindung wird im nachfolgenden Bei  spiel näher     beschrieben.    Zwischen Gewichts  teil und     Vohunteil    besteht die gleiche Bezie  hung wie     zwischen    Gramm und Kubikzenti  meter.  



  <I>Beispiel:</I>  4,2 Gewichtsteile     2-Phenyl-4(oder        5)-me-          thyl-6-chlor-pyridazon-(3)    werden im geschlos  senen Gefäss mit 50     Volumteilen    einer     30o/oigen          äthylalkohol.ischen        Dimethylaminlösung    sechs  Stunden auf 190-195  erhitzt. Man verjagt  die leicht flüchtigen Anteile im Vakuum auf  dem siedenden Wasserbad und kristallisiert  den Rückstand mehrmals aus     Cyclohexan    un  ter Verwendung von Tierkohle um.

   Das so er  haltene     6-Dimethylainino-2-phenyl-4(oder        5)-          met11yl-pyridazon-(3)        schmilzt    bei 91-92 .  



  Das als Ausgangsstoff verwendete     2-Phe-          nyl-4(oder        5)-methyl-6-chlor-pyridazon-(3)     kann durch     Chlorierung    aus dem auf übliche  Weise     gewonnenen        2-Phenyl-4    (oder 5)     -methyl-          6-oxy-pyridazon-(3)    vom F. =     226-2.28         wie          folgt    erhalten werden:

    3 Gewichtsteile     2-Phenyl-4    (oder     5)-methyl-          6-oxy-pyridazon-(3)    werden mit 15     Volum-          teilen        Phosphoroxychlorid        einige    Zeit auf dem  siedenden Wasserbad erhitzt. Das     Phosphor-          oxychlorid    wird hierauf weitgehend     abdestil-          liert    und der Rückstand auf Eis gegossen.  Nach längerem Stehen wird der feste     Anteil          abgenutscht,    mit Wasser gewaschen und mehr  mals aus absolutem Äthanol umkristallisiert.

        Das so erhaltene     2-Phenyl-4(oder        5)-methyl-6-          chlor-pyridazon-(3)    der Formel  
EMI0002.0004     
         schmilzt    bei 136-137 .



      Ornamental process for the <B> production of </B> a pyridazon. The subject of the present patent is a process for the preparation of 6-dimethyllamino-2-phenyl-4 (or 5) -methyl-pyridazon- (3) of the formula
EMI0001.0008
    The new compound is obtained when 2-phenyl-4 (or 5) -methyl-pyridazon- (3), which has an exchangeable substituent in the 6-position, with.

       Dimethylamine sets. An exchangeable substituent is, for example, a halogen, in particular a chlorine atom, or a substituted oxy, such as phenoxy, or mereapto, such as methylymercapto group.



  The reaction can be carried out in the presence or absence of diluents and / or condensation agents and / or catalysts in an open or closed vessel under pressure.



  The product of the process, the 6-dimethyl-ainino-2-pheilyl-4 (or 5) -methyl-pyridazon- (3) of F. = 91-92, is new. It shows an antipyretic and analgesic effect and is said to be used as a remedy. The invention is described in more detail in the following example. There is the same relationship between the weight part and the excess as there is between grams and cubic centimeters.



  <I> Example: </I> 4.2 parts by weight of 2-phenyl-4 (or 5) -methyl-6-chloro-pyridazon- (3) are placed in a closed vessel with 50 parts by volume of 30% ethyl alcohol. ical dimethylamine solution heated to 190-195 for six hours. The volatile components are driven off in vacuo on the boiling water bath and the residue is recrystallized several times from cyclohexane using animal charcoal.

   The 6-dimethylainino-2-phenyl-4 (or 5) -met11yl-pyridazon- (3) obtained in this way melts at 91-92.



  The 2-phenyl-4 (or 5) -methyl-6-chloro-pyridazon- (3) used as starting material can be obtained by chlorination from the 2-phenyl-4 (or 5) -methyl- 6- oxy-pyridazon- (3) from F. = 226-2.28 can be obtained as follows:

    3 parts by weight of 2-phenyl-4 (or 5) -methyl-6-oxy-pyridazon- (3) are heated with 15 parts by volume of phosphorus oxychloride for some time on a boiling water bath. Most of the phosphorus oxychloride is then distilled off and the residue is poured onto ice. After standing for a long time, the solid fraction is filtered off with suction, washed with water and recrystallized several times from absolute ethanol.

        The 2-phenyl-4 (or 5) -methyl-6-chloro-pyridazon- (3) of the formula obtained in this way
EMI0002.0004
         melts at 136-137.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Pyrid- azons, dadurch gekennzeichnet, da.ss man 2- Phenyl-4(oder 5)-methyl-pyridazon-(3), das in 6-Stellung einen austauschfähigen Substi- tuenten aufweist, mit. Dimethylamin umsetzt. Claim: A process for the production of a pyridazone, characterized in that 2-phenyl-4 (or 5) -methyl-pyridazon- (3), which has an exchangeable substituent in the 6-position, with. Dimethylamine converts. Das Verfahrensprodukt, das 6-Dimethyl- t amino <B>-</B> 2<B>-</B> phenyl <B>-</B> 4 (oder 5) -methyl-pyridazon- (3) vom F. = 91-92 , ist neu. Es soll als Heilmittel Verwendung finden. UNTER.ANSPRL CHF 1. Verfahren nach Patentanspruch, da durch gekennzeichnet, dass man 2-Phenyl-4 (oder 5)-methyl-6-halogen-pyridazon-(3) mit Dimethylamin umsetzt. 2. The process product, the 6-dimethyl- t amino <B> - </B> 2 <B> - </B> phenyl <B> - </B> 4 (or 5) -methyl-pyridazon- (3) from F. = 91-92, is new. It is said to be used as a remedy. UNTER.ANSPRL CHF 1. Process according to claim, characterized in that 2-phenyl-4 (or 5) -methyl-6-halo-pyridazon- (3) is reacted with dimethylamine. 2. Verfahren. nach Patentanspruch und Unteranspruch 1, dadurch gekennzeichnet, dass man 2-Phenyl-4(oder 5)-methyl-6-chlor- pyridazon-(3) mit Dimethylamin umsetzt. Procedure. according to claim and dependent claim 1, characterized in that 2-phenyl-4 (or 5) -methyl-6-chloropyridazon- (3) is reacted with dimethylamine.
CH312533D 1952-06-20 1952-06-20 Process for making a pyridazone. CH312533A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH310245T 1952-06-20
CH312533T 1952-06-20

Publications (1)

Publication Number Publication Date
CH312533A true CH312533A (en) 1955-12-31

Family

ID=25735641

Family Applications (1)

Application Number Title Priority Date Filing Date
CH312533D CH312533A (en) 1952-06-20 1952-06-20 Process for making a pyridazone.

Country Status (1)

Country Link
CH (1) CH312533A (en)

Similar Documents

Publication Publication Date Title
CH312533A (en) Process for making a pyridazone.
CH312531A (en) Process for making a pyridazone.
CH312530A (en) Process for making a pyridazone.
CH312534A (en) Process for making a pyridazone.
DE894994C (en) Process for the production of aliphatic mercury ketone compounds
DE668492C (en) Process for the preparation of aminoethylephedrine
CH312532A (en) Process for making a pyridazone.
AT146967B (en) Process for the production of heavy metal compounds of the porphine series.
CH310245A (en) Process for making a pyridazone.
DE941372C (en) Process for the preparation of nuclear mono-acylated phloroglucins
CH313318A (en) Process for making a pyridazone
DE911259C (en) Process for the preparation of O-phenyl derivatives of the oxybenzal thiosemicarbazones
DE531083C (en) Process for the preparation of 5,6-dialkoxy-8-aminoquinolines
DE851065C (en) Process for the production of valuable condensation products
DE853380C (en) Process for obtaining a pepper substitute
CH313317A (en) Process for making a pyridazone
CH199906A (en) Process for the preparation of an imidazole dihydride (4,5) substituted in the 2-position.
CH154173A (en) Process for the preparation of 5,6-dimethoxy-8-aminoquinoline.
CH159941A (en) Process for the preparation of tribromoethyl alcohol.
CH143244A (en) Process for the preparation of a compound with a hydrogenated ring system.
CH204437A (en) Process for the production of a new azo dye.
CH194876A (en) Process for the preparation of 2 (3 &#39;, 5&#39;-Diiodo-2&#39;-B-oxethyl-4&#39;-oxypheny) - 6-iodoquinoline-4-carboxylic acid.
CH295836A (en) Process for the preparation of a product of the thiosemicarbazone series.
CH175234A (en) Process for the preparation of 4-amino-3-ethoxy-4&#39;-methoxy-diphenylamine.
CH265759A (en) Process for the preparation of a new mercury compound.