CH311622A - Process for the production of a new basic substituted fatty acid (2-halogen-6-methyl-anilide). - Google Patents

Process for the production of a new basic substituted fatty acid (2-halogen-6-methyl-anilide).

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Publication number
CH311622A
CH311622A CH311622DA CH311622A CH 311622 A CH311622 A CH 311622A CH 311622D A CH311622D A CH 311622DA CH 311622 A CH311622 A CH 311622A
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CH
Switzerland
Prior art keywords
anilide
methyl
halogen
production
pyrrolidine
Prior art date
Application number
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German (de)
Inventor
Aktiengesellschaft Cilag
Original Assignee
Cilag Ag
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Filing date
Publication date
Application filed by Cilag Ag filed Critical Cilag Ag
Publication of CH311622A publication Critical patent/CH311622A/en

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Description

  

  Verfahren     zur    Herstellung     eines    neuen basisch substituierten Fettsäure  (2-halogen-6.methyl-anilids).    Gegenstand des vorliegenden Patentes bil  det ein Verfahren zur Herstellung eines neuen  basisch substituierten     Fettsäure-(2-halogen-6-          methyl-anilids),    welches dadurch gekennzeich  net ist, dass man eine Verbindung der Formel  
EMI0001.0005     
    in welcher X einen     reaktionsfähigen,    während  der Reaktion sich abspaltenden Rest bedeutet,  mit.     Pyrrolidin        umsetzt.     



  Der     Rest    X kann in einem Halogenatom  oder einem     sonstigen    für den     Austausch    gegen  den basischen Rest geeigneten reaktionsfähi  gen     Substituenten,    wie z. B. einer     AlkyIsul-          fonyloxy-    oder     Arylsulfonyloxygruppe,    beste  hen. Der Austausch der Gruppe X gegen den       Pyrrolidinrest    erfolgt z. B. durch einfaches  Erwärmen mit     Pyrrolidin    gegebenenfalls in  Gegenwart. eines basisch reagierenden Konden  sationsmittels oder von     Pyrrolidin    im Über  sehuss.

   Das     a-Pyrrolidino-propionsäure-        (2-          chlor-6-rnethyl-anilid)    ist ein farbloses, unter  0,02 mm     Hg    bei 133-136  siedendes Öl, das  nach einiger Zeit zu farblosen, bei 71-73   schmelzenden Kristallen erstarrt. Das Hydro  chlorid der Base schmilzt bei 243-246  unter  Zersetzung.    Das neue     Anilid    soll als     Lokalanästhetikum     und als Zwischenprodukt zur Herstellung wei  terer Derivate Verwendung finden.  



       Beispiel:     55     Gewichtsteile        a-Brom-propionsäure-(2-          chlor-6-methyl-anüid)    (gewonnen durch Um  setzen von     2-Chlor-6-methyl-aniilin    mit     a-Bröm-          propionylchlorid    in Gegenwart von Natrium  acetat,     Schmp.    145-147 ) werden in     Ätha-          nol    suspendiert und mit. 42 Gewichtsteilen       Pyrrolidin    versetzt. Die Temperatur     steigt     dabei leicht an und ein grosser Teil des       Reaktionsgemisches    geht in Lösung.

   Nun  wird während 4     Stunden    bei Zimmertem  peratur     gerührt    und dann einige Stunden  bei 65-75 . Eine Probe mit Wasser und nach  folgend mit verdünnter Salzsäure versetzt er  gibt wieder Lösung des ausgefallenen Nieder  schlages. Mit     Wasserdampf    wird hierauf der  Alkohol und das überschüssige     Pyrrolidin    ab  geblasen und nach dem Erkalten das zurück  bleibende Öl in Äther aufgenommen. Nach  dem Trocknen der ätherischen Lösung und  Verjagen des     Lösungsmittels    verbleibt ein Öl,  das durch     Vakuumdestillation        gereinigt    wird.

    Man erhält 44     Gewichtsteile    reines     a-Pyrro-          lidino-propionsäure-(2-chlor-6-methyl-anilid)    .  Die     Umsetzung    mit     Pyrrolidin    kann auch in  Benzol     stattfinden.  



  Process for the production of a new basic substituted fatty acid (2-halogen-6.methyl-anilids). The subject of the present patent bil det a process for the preparation of a new basic substituted fatty acid (2-halo-6-methyl-anilide), which is characterized in that a compound of the formula
EMI0001.0005
    in which X denotes a reactive radical which is split off during the reaction, with. Reacts pyrrolidine.



  The radical X can be in a halogen atom or other suitable reactive substituents for replacement with the basic radical, such as. B. an AlkyIsul- fonyloxy or arylsulfonyloxy group, best hen. The exchange of the group X against the pyrrolidine radical takes place, for. B. by simply heating with pyrrolidine, optionally in the presence. an alkaline condensation agent or an excess of pyrrolidine.

   The a-pyrrolidino-propionic acid- (2-chloro-6-methyl-anilide) is a colorless oil, boiling below 0.02 mm Hg at 133-136, which solidifies after some time to colorless crystals melting at 71-73. The hydrochloride of the base melts at 243-246 with decomposition. The new anilide is to be used as a local anesthetic and as an intermediate for the production of further derivatives.



       Example: 55 parts by weight of a-bromopropionic acid (2-chloro-6-methyl-anuide) (obtained by converting 2-chloro-6-methyl-aniline with a-bromopropionyl chloride in the presence of sodium acetate, mp. 145-147) are suspended in ethanol and mixed with. 42 parts by weight of pyrrolidine are added. The temperature rises slightly and a large part of the reaction mixture goes into solution.

   The mixture is then stirred for 4 hours at room temperature and then for a few hours at 65-75. A sample is mixed with water and then mixed with dilute hydrochloric acid. He gives a solution of the precipitate again. The alcohol and the excess pyrrolidine are then blown off with steam and, after cooling, the remaining oil is absorbed in ether. After the essential solution has dried and the solvent has been driven off, an oil remains which is purified by vacuum distillation.

    44 parts by weight of pure α-pyrrolidino-propionic acid (2-chloro-6-methyl-anilide) are obtained. The reaction with pyrrolidine can also take place in benzene.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines neuen basisch substituierten PettsKure-(2-halogen-6- methyl-anilids), dadurch gekennzeichnet, dass man eine Verbindung der Formel EMI0002.0002 in welcher X einen reaktionsfähigen, während der Reaktion sich abspaltenden Rest bedeutet, mit Pyrrolidin umsetzt. Das auf diese Weise erhaltene a-Pyrrolidino-propionsäure-(2-chlor- 6-meth-yl-anilid) bildet ein farbloses, unter 0,02 mm bei 133-136 siedendes Öl, das nach einiger Zeit zu farblosen, bei 7l-73 schmel zenden Kristallen erstarrt. PATENT CLAIM: Process for the production of a new basic substituted PettsKure- (2-halogen-6-methyl-anilide), characterized in that a compound of the formula EMI0002.0002 in which X is a reactive radical which is split off during the reaction, reacts with pyrrolidine. The a-pyrrolidino-propionic acid- (2-chloro-6-meth-yl-anilide) obtained in this way forms a colorless oil, boiling below 0.02 mm at 133-136, which after some time becomes colorless, at 7l- 73 melting crystals solidified. Das Hydrochlorid der Base schmilzt bei 243-246 unter Zer setzung. Das neue Anilid soll als Lokalanästhetikum und als Zwischenprodukt. Verwendung finden. UNTERANSPRUCH: Verfahren nach Patentanspruch, dadurch gekennzeichnet, da.ss man ein a-Halogen-pro- pionsäure-(2-chlor-6-methyl-anilid) mit Pyrro- lidin reagieren lässt. The hydrochloride of the base melts at 243-246 with decomposition. The new anilide is said to be used as a local anesthetic and as an intermediate. Find use. SUBClaim: Process according to patent claim, characterized in that an α-halogenopropionic acid (2-chloro-6-methyl-anilide) is allowed to react with pyrrolidine.
CH311622D 1952-02-25 1952-02-25 Process for the production of a new basic substituted fatty acid (2-halogen-6-methyl-anilide). CH311622A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH311622T 1952-02-25
CH307799T 1952-11-25

Publications (1)

Publication Number Publication Date
CH311622A true CH311622A (en) 1955-11-30

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CH311622D CH311622A (en) 1952-02-25 1952-02-25 Process for the production of a new basic substituted fatty acid (2-halogen-6-methyl-anilide).

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CH (1) CH311622A (en)

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