CH491853A - Process for preparing the ethyl ester of a derivative of fluoracetic acid - Google Patents

Process for preparing the ethyl ester of a derivative of fluoracetic acid

Info

Publication number
CH491853A
CH491853A CH443270A CH443270A CH491853A CH 491853 A CH491853 A CH 491853A CH 443270 A CH443270 A CH 443270A CH 443270 A CH443270 A CH 443270A CH 491853 A CH491853 A CH 491853A
Authority
CH
Switzerland
Prior art keywords
sep
preparing
derivative
ethyl ester
ethyl
Prior art date
Application number
CH443270A
Other languages
French (fr)
Inventor
Testa Emilio
Cavalleri Bruno
Bellasio Elvio
Maffii Giulio
Original Assignee
Lepetit Spa
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
Priority claimed from GB37197/67A external-priority patent/GB1217689A/en
Application filed by Lepetit Spa filed Critical Lepetit Spa
Publication of CH491853A publication Critical patent/CH491853A/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D307/00Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/77Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D307/91Dibenzofurans; Hydrogenated dibenzofurans
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C57/00Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
    • C07C57/52Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms containing halogen
    • C07C57/58Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms containing halogen containing six-membered aromatic rings

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

  Procédé de préparation de l'ester éthylique d'un dérivé de l'acide fluoracétique    La présente invention concerne un procédé de pré  paration de nouveaux composés répondant à la formule  générale suivante    R-CHF-COOC2H5    dans laquelle R désigne un radical aryle,     dibenzo-          furannyle    ou un radical ayant la formule  
EMI0001.0002     
    dans laquelle R' désigne un radical alcoyle ou alcoxy  contenant de 1 à 8 atomes de carbone.  



  Suivant ce procédé, on fait réagir un composé de    formule générale  
EMI0001.0003     
    dans laquelle R a la signification ci-dessus, avec de la  2-chloro-1,1,2-trifluoro-triéthylamine, dans un solvant  organique inerte anhydre. Bien que la réaction ait lieu  avec des quantités environ équimoléculaires des deux  réactifs, on préfère utiliser un excès plus ou moins im  portant du deuxième réactif.  
EMI0001.0004     
    <B>5</B>  <B>1</B>  Les composés préparés par le procédé suivant l'in  vention se sont révélés utiles en vertu de leur activité  anti-inflammatoire.

      Exemple 1:    <I>Préparation</I>  p-méthoxyphényl(fluoro)-acétate d'éthyle  A une solution de 11,65 g (55 millimoles de     p-méth-          oxy-mandélate    d'éthyle dans 150 ml de chlorure de mé  thylène anhydre> on a ajouté 20,8 g (0,11 mole) de     2-          chloro-1,1,2-trifluorotriéthvlamine.    On a laissé la solution  reposer pendant la nuit à 5  C. puis pendant 5 heures  supplémentaires à température ambiante. On l'a alors  lavée au moyen d'une solution saturée de     carbonate    de  sodium, et ensuite avec de l'eau. on a séché sur du sul  fate de sodium anhydre et on a concentré.

   On a obtenu  un résidu qui est distillé sous vide> on a recueilli la frac  tion bouillant à 100-106      C./0.2    mm. On a obtenu une  quantité de 8,6 g de fluoro(p-méthoxyphényl)acétate  d'éthyle. Rendement 73,8  <I>Préparation</I>  <I>y</I>  de  
EMI0001.0011     
  
    Analyse
<tb>  Calculé <SEP> pour <SEP> C11H13FO3
<tb>  C <SEP> 62,25 <SEP> H <SEP> 6,17 <SEP> F <SEP> 8,9
<tb>  Trouvé
<tb>  C <SEP> 61,59 <SEP> H <SEP> 5,80 <SEP> F <SEP> 8,6       <I>Exemple 2:

  </I>    de p-éthoxyphényl(fluoro)-acétate d'éthyle  A une solution de 8,3 g (37 moles)     p-éthoxy-          mandélate    d'éthyle dans 160 ml de chlorure de     méthy-          iène,    on ajoute 13,6g (72 moles) de     2-chloro-1,l,2-tri-          fluoro-triéthylamine.    On laisse reposer le     mélange    pen  dant 15 h à 0-5  C, puis pendant encore 4 h à la tempé  rature ordinaire. On lave tout d'abord la solution avec  une solution de carbonate de sodium saturée, puis avec  de l'eau, on la sèche sur du sulfate de sodium et on  chasse le solvant par évaporation.

   On distille sous vide      le résidu huileux. consistant en     p-éthoxyphényl(fluoro)-          acétate    d'éthyle. Rendement 81,1 0/0 ; n20D = 1,5093.  
EMI0002.0002     
  
    Analyse
<tb>  Calculé <SEP> pour <SEP> C12H15FO3
<tb>  C <SEP> 63,69 <SEP> H <SEP> 6,68 <SEP> F <SEP> 8,39
<tb>  Trouvé
<tb>  C <SEP> 63,75 <SEP> H <SEP> 6,52 <SEP> F <SEP> 8,30       Exemple 3:  Préparation  du p-isohutylphényl(fluoro)-acétate d'éthyle  Préparé à partir de 3,54 (15 millimoles) de     p-isobutyl-          mandélate    d'éthyle et 5,67 g (30 millimoles) de     2-chloro-          1,1,2-trifluoro-triéthylamine.    Rendement 63,2 0/o ; n20 D =  1,4963.

    
EMI0002.0007     
  
    Analyse
<tb>  Calculé <SEP> pour <SEP> C14H10F02
<tb>  C <SEP> 70,56 <SEP> H <SEP> 8,03 <SEP> F <SEP> 7,97
<tb>  Trouvé
<tb>  C <SEP> 70,64 <SEP> H <SEP> 7,93 <SEP> F <SEP> 7,90       <I>Exemples</I>     4-S     Les composés suivants ont été préparés essentielle  ment de la manière décrite dans l'exemple 1.

    
EMI0002.0009     
  
    R <SEP> Rendement <SEP> 0/o
<tb>  1-naphtyle <SEP> 71,3 <SEP> n20 D <SEP> - <SEP> 1,5801
<tb>  2-dibenzofuranyle <SEP> 69,4 <SEP> p.f. <SEP> 76-77', <SEP> C       REVENDICATION  Procédé de préparation de l'ester éthylique d'un dé  rivé de l'acide fluoracétique de formule  R-CHF-COOC2H5  dans laquelle R est un groupe aryle, dibenzofurannyle  ou un radical de formule  
EMI0002.0010     
    dans laquelle R' est un groupe alcoyle de l à 8 atomes  de carbone ou alcoxy de 1 à 8 atomes de carbone,  en ce que l'on fait réagir un composé  formule  anhydre.  
EMI0002.0011     
    dans laquelle R a la signification ci-dessus, avec au  moins une quantité équimoléculaire de     2-chloro-1,1,2-          trifluoro-triéthylamine>    dans un solvant organique inerte  SOUS-REVENDICATIONS  I.

   Procédé selon la revendication, caractérisé en ce  que R est p-isobutylphényle.  



  2. Procédé selon la revendication,     caractérisé    en ce  que R est 2-dibenzofurannyle.



  Process for preparing the ethyl ester of a derivative of fluoracetic acid The present invention relates to a process for preparing novel compounds corresponding to the following general formula R-CHF-COOC2H5 in which R denotes an aryl radical, dibenzo- furanyl or a radical having the formula
EMI0001.0002
    in which R 'denotes an alkyl or alkoxy radical containing from 1 to 8 carbon atoms.



  According to this process, a compound of general formula is reacted
EMI0001.0003
    wherein R has the meaning above, together with 2-chloro-1,1,2-trifluoro-triethylamine, in an anhydrous inert organic solvent. Although the reaction takes place with about equimolecular amounts of the two reagents, it is preferred to use a more or less large excess of the second reagent.
EMI0001.0004
    <B> 5 </B> <B> 1 </B> The compounds prepared by the process according to the invention have been found useful by virtue of their anti-inflammatory activity.

      Example 1: <I> Preparation </I> ethyl p-methoxyphenyl (fluoro) -acetate To a solution of 11.65 g (55 millimoles of ethyl p-methoxy-mandelate in 150 ml of ethyl chloride Anhydrous methylylene> 20.8 g (0.11 mol) of 2-chloro-1,1,2-trifluorotriethylamine were added The solution was left to stand overnight at 5 ° C. then for a further 5 hours at temperature. It was then washed with saturated sodium carbonate solution, and then with water, dried over anhydrous sodium sulfate and concentrated.

   A residue was obtained which was vacuum distilled> the fraction boiling at 100-106 ° C./0.2 mm was collected. An amount of 8.6 g of ethyl fluoro (p-methoxyphenyl) acetate was obtained. Yield 73.8 <I> Preparation </I> <I> y </I> of
EMI0001.0011
  
    Analysis
<tb> Calculated <SEP> for <SEP> C11H13FO3
<tb> C <SEP> 62.25 <SEP> H <SEP> 6.17 <SEP> F <SEP> 8.9
<tb> Found
<tb> C <SEP> 61.59 <SEP> H <SEP> 5.80 <SEP> F <SEP> 8.6 <I> Example 2:

  </I> ethyl p-ethoxyphenyl (fluoro) -acetate To a solution of 8.3 g (37 mol) ethyl p-ethoxy-mandelate in 160 ml of methylene chloride is added 13, 6g (72 moles) of 2-chloro-1,1,2-tri-fluoro-triethylamine. The mixture is left to stand for 15 h at 0-5 C, then for a further 4 h at room temperature. The solution is washed first with saturated sodium carbonate solution, then with water, dried over sodium sulfate and the solvent removed by evaporation.

   The oily residue is distilled off under vacuum. consisting of p-ethoxyphenyl (fluoro) - ethyl acetate. Yield 81.1%; n20D = 1.5093.
EMI0002.0002
  
    Analysis
<tb> Calculated <SEP> for <SEP> C12H15FO3
<tb> C <SEP> 63.69 <SEP> H <SEP> 6.68 <SEP> F <SEP> 8.39
<tb> Found
<tb> C <SEP> 63.75 <SEP> H <SEP> 6.52 <SEP> F <SEP> 8.30 Example 3: Preparation of ethyl p-isohutylphenyl (fluoro) -acetate Prepared from 3.54 (15 millimoles) of ethyl p-isobutyl mandelate and 5.67 g (30 millimoles) of 2-chloro-1,1,2-trifluoro-triethylamine. Yield 63.2 0 / o; n20 D = 1.4963.

    
EMI0002.0007
  
    Analysis
<tb> Calculated <SEP> for <SEP> C14H10F02
<tb> C <SEP> 70.56 <SEP> H <SEP> 8.03 <SEP> F <SEP> 7.97
<tb> Found
<tb> C <SEP> 70.64 <SEP> H <SEP> 7.93 <SEP> F <SEP> 7.90 <I> Examples </I> 4-S The following compounds were prepared essentially from as described in Example 1.

    
EMI0002.0009
  
    R <SEP> Efficiency <SEP> 0 / o
<tb> 1-naphthyl <SEP> 71.3 <SEP> n20 D <SEP> - <SEP> 1.5801
<tb> 2-dibenzofuranyl <SEP> 69.4 <SEP> m.p. <SEP> 76-77 ', <SEP> C CLAIM Process for preparing the ethyl ester of a fluoracetic acid derivative of formula R-CHF-COOC2H5 in which R is an aryl or dibenzofuranyl group or a radical formula
EMI0002.0010
    wherein R 'is an alkyl group of 1 to 8 carbon atoms or alkoxy of 1 to 8 carbon atoms, in that an anhydrous compound of the formula is reacted.
EMI0002.0011
    where R has the meaning above, with at least an equimolecular amount of 2-chloro-1,1,2-trifluoro-triethylamine> in an inert organic solvent SUB-CLAIMS I.

   Process according to claim, characterized in that R is p-isobutylphenyl.



  2. Method according to claim, characterized in that R is 2-dibenzofuranyl.

 
CH443270A 1967-08-14 1968-08-05 Process for preparing the ethyl ester of a derivative of fluoracetic acid CH491853A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB37197/67A GB1217689A (en) 1967-08-14 1967-08-14 Ethyl esters of fluro-acetic acids
CH1169768A CH491852A (en) 1967-08-14 1968-08-05 Process for preparing the ethyl ester of a derivative of fluoracetic acid

Publications (1)

Publication Number Publication Date
CH491853A true CH491853A (en) 1970-06-15

Family

ID=25708764

Family Applications (1)

Application Number Title Priority Date Filing Date
CH443270A CH491853A (en) 1967-08-14 1968-08-05 Process for preparing the ethyl ester of a derivative of fluoracetic acid

Country Status (1)

Country Link
CH (1) CH491853A (en)

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