CH242496A - Process for the preparation of a new benzenesulfonamide derivative. - Google Patents

Process for the preparation of a new benzenesulfonamide derivative.

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Publication number
CH242496A
CH242496A CH242496DA CH242496A CH 242496 A CH242496 A CH 242496A CH 242496D A CH242496D A CH 242496DA CH 242496 A CH242496 A CH 242496A
Authority
CH
Switzerland
Prior art keywords
pyrazole
benzenesulfonamido
amino
new
preparation
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 CH242496A publication Critical patent/CH242496A/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D231/00Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
    • C07D231/02Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
    • C07D231/10Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D231/14Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or 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
    • C07D231/38Nitrogen atoms
    • C07D231/42Benzene-sulfonamido pyrazoles

Description

  

      Verfahren    zur     Herstellung    eines neuen     _Benzolsulfonamidderivates.       Gegenstand des vorliegenden     Patentes    ist  ein Verfahren zur Herstellung eines neuen       Benzolsulfonamidderivates,    das dadurch     ge-          kennzeichnet    ist, dass man ein     3-Benzol-          sulfonamido-pyrazol,    das in     p-Stellung    einen       durch    Hydrolyse in die     Aminogruppe    über  führbaren     Substituenten    aufweist,

   mit     -einem          hydrolysierenden    Mittel behandelt.  



  Das so erhaltene 3 - (p -     Amino    -     benzol-          sufonamido)-pyrazol    ist ein     kristallines    Pul  ver vom F.     224-226 .    Die neue     Verbindung     soll als Arzneimittel sowie als Zwischen  produkt Verwendung finden.  



  Das     3-Benzolsulfonamido-pyräzol,    das in       p-Stellung    zur     Sulfonamidgruppe        einen    durch  Hydrolyse     in    die     Aminogxuppe    überführ  baren     Substituenten    enthält, kann auf ver  schiedene Art     und    Weise     .gewonnen    werden.

    Besonders geeignet ist die Umsetzung der  entsprechenden reaktionsfähigen     Benzolsul-          fonsäurederivate,    insbesondere der     Benzol-          sulfonsäurehalogenide,    mit     Pyrazolverbindun-          gen,    die in     3-Stellung        eine    Gruppe ent  halten, die mit dem     Benzolsulfonsäurederivat       ein     3-Benzolsulfonamido-pyrazol    zu bilden  vermag, wie     mit        3-Amino-pyrazol.    Man kann  auch entsprechende Sulfonamide der Formel  R .

       SO,NHY,    in der Y     einen    bei der nach  folgenden Reaktion sich abspaltenden Rest  bedeutet, mit     3-Halogen-pyrazolen    umsetzen.  Auch können andere dem Fachmann ge  läufige Herstellungsmethoden benutzt werden.  <I>Beispiel 1:</I>  28 g 3 - (p -     Acetylamino    -     benzolsi-lfon-          amido)-pyrazol,    das durch Kondensation  von p -     Acetylamino    -     benzolsulfochlorid    mit       3-Amino-pyrazol    erhalten wurde, werden  mit einer Lösung von 12 g     Natriumhydrogyd     in 150 cm' Wasser zwei     Stunden    unter Rück  fluss gekocht.

   Die Lösung wird gegebenen  falls unter Zusatz von Tierkohle filtriert und  mit konzentrierter     Salzsäure    neutralisiert.  Dabei fällt das     3-(p-Amino-benzolsulfon-          amido)-pyrazo1    als' kristallines Pulver aus.

    Die     Verbindung    wird durch Umkristallisa  tion     aus        verdünnter        Essigsäure        gereinigt    und  zeigt dann den     Schmelzpunks        224-226 .         <I>Beispiel 2:

   -</I>  31 g     3-(p-Carbäthoxyamino-benzolsulfon-          amido)-pyrazol,    das durch     Kondensation    von  p -     Carbäthoxyamino    -     benzolsulfochlorid    mit       3-Aminö-pyrazol    erhalten würde, werden wie  im Beispiel 1 mit einer     wässrigen    Lösung  von 12 g     Natriumhydroxyd    in 150 cm'  Wasser unter Kochen verseift.

   Nach der       Neutralisation    mit Salzsäure wird das ge  bildete 3 - (p -     Amino    -     benzolsulfonamido)        -          pyrazol        isoliert    und durch     Umkristallisieren          gereinigt..    Schmelzpunkt     224-226 .     



  Die- Hydrolyse kann auch     mit    andern  alkalischen Mitteln, beispielsweise     Erdalkali-          hydroxyden,    wie     Calciumhydroxyd,    oder mit  sauren Mitteln, z. B. Salzsäure, in -Gegenwart  von Wasser oder organischen     Lösungsmitteln,          wie    Alkohol, durchgeführt werden.    Das gebildete     p-Amino-benzolsulfonamid-          derivat    lässt sich ferner     in    Form seiner Salze,  z. B. des Natriums oder des     Calciums-,     isolieren.



      Process for the production of a new benzene sulfonamide derivative. The subject of the present patent is a process for the preparation of a new benzenesulfonamide derivative, which is characterized in that a 3-benzenesulfonamido-pyrazole which has a substituent which can be converted into the amino group by hydrolysis in the p-position,

   treated with a hydrolyzing agent.



  The 3 - (p - amino - benzene sufonamido) pyrazole obtained in this way is a crystalline powder of F. 224-226. The new compound is to be used as a medicinal product and as an intermediate product.



  The 3-benzenesulfonamido-pyrazole, which contains a substituent which can be converted into the amino group by hydrolysis in the p-position relative to the sulfonamide group, can be obtained in various ways.

    The reaction of the corresponding reactive benzenesulfonic acid derivatives, in particular the benzenesulfonic acid halides, with pyrazole compounds which contain a group in the 3-position which is able to form a 3-benzenesulfonamido-pyrazole with the benzenesulfonic acid derivative, as with 3 -Amino-pyrazole. Corresponding sulfonamides of the formula R can also be used.

       SO, NHY, in which Y denotes a radical which is split off in the following reaction, with 3-halopyrazoles. Other production methods familiar to the person skilled in the art can also be used. <I> Example 1: </I> 28 g of 3 - (p - acetylamino - benzenesi-lfon-amido) pyrazole, which was obtained by condensation of p - acetylamino - benzenesulfochloride with 3-amino-pyrazole, are mixed with a solution boiled under reflux for two hours from 12 g of sodium hydrogen in 150 cm of water.

   The solution is filtered if necessary with the addition of animal charcoal and neutralized with concentrated hydrochloric acid. The 3- (p-amino-benzenesulfonamido) -pyrazole precipitates out as a crystalline powder.

    The compound is purified by recrystallization from dilute acetic acid and then has the melting point 224-226. <I> Example 2:

   - </I> 31 g of 3- (p-carbethoxyamino-benzenesulfonamido) -pyrazole, which would be obtained by condensation of p-carbethoxyamino-benzenesulfochloride with 3-aminö-pyrazole, as in Example 1 with an aqueous solution of 12 g of sodium hydroxide saponified in 150 cm of water while boiling.

   After neutralization with hydrochloric acid, the 3 - (p - amino - benzenesulfonamido) pyrazole formed is isolated and purified by recrystallization. Melting point 224-226.



  The hydrolysis can also be carried out with other alkaline agents, for example alkaline earth metal hydroxides, such as calcium hydroxide, or with acidic agents, e.g. B. hydrochloric acid, in the presence of water or organic solvents such as alcohol, can be carried out. The p-amino-benzenesulfonamide derivative formed can also be used in the form of its salts, e.g. B. of sodium or calcium isolate.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines neuen Benzolsulfonamidderivates, dadurch gekenn zeichnet, dass- man ein 3-Benzolsulfonamido- pyrazol, das in p-Stelliuig einen durch Hy drolyse in die Aminogruppe überführbären Substituenten aufweist, mit einem hydroly- Bierenden Mittel behandelt. PATENT CLAIM: Process for the production of a new benzenesulfonamide derivative, characterized in that a 3-benzenesulfonamido pyrazole, which has a substituent which can be converted into the amino group by hydrolysis, is treated with a hydrolyzing agent. Das so erhaltene 3 - (p - Amino - benzol- sulfonamido)-pyra.zol ist ein kristallines Pul ver vom F. 224-226 . Die neue Verbindung soll als Arzneimittel sowie als Zwischen- Produkt Verwendung finden. The 3 - (p-amino-benzenesulfonamido) -pyra.zol obtained in this way is a crystalline powder of F. 224-226. The new compound is to be used as a medicinal product and as an intermediate product.
CH242496D 1939-05-23 1941-05-23 Process for the preparation of a new benzenesulfonamide derivative. CH242496A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE242496X 1939-05-23
CH240223T 1945-12-15

Publications (1)

Publication Number Publication Date
CH242496A true CH242496A (en) 1946-05-15

Family

ID=25728495

Family Applications (1)

Application Number Title Priority Date Filing Date
CH242496D CH242496A (en) 1939-05-23 1941-05-23 Process for the preparation of a new benzenesulfonamide derivative.

Country Status (1)

Country Link
CH (1) CH242496A (en)

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