BE836488R - PROCESS FOR THE PREPARATION OF OPTICALLY ACTIVE AJMALICIN AND EPI-19-AJMALICIN - Google Patents

PROCESS FOR THE PREPARATION OF OPTICALLY ACTIVE AJMALICIN AND EPI-19-AJMALICIN

Info

Publication number
BE836488R
BE836488R BE162618A BE162618A BE836488R BE 836488 R BE836488 R BE 836488R BE 162618 A BE162618 A BE 162618A BE 162618 A BE162618 A BE 162618A BE 836488 R BE836488 R BE 836488R
Authority
BE
Belgium
Prior art keywords
emi
formula
product
ajmalicin
iii
Prior art date
Application number
BE162618A
Other languages
French (fr)
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 filed Critical
Priority to BE162618A priority Critical patent/BE836488R/en
Application granted granted Critical
Publication of BE836488R publication Critical patent/BE836488R/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D491/00Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
    • C07D491/22Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains four or more hetero rings

Landscapes

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

Description

       

   <EMI ID=1.1> 

  
La présente invention concerne un procédé de

  
 <EMI ID=2.1>  

  
L'invention vise à obtenir* ces* deux 'composés  avec de meilleurs rendements. 

  
A cet effet, au lieu de cycliser la déméthylcorynanthéine, on effectue la cyclisation directement sur la

  
 <EMI ID=3.1> 

  
 <EMI ID=4.1> 

  
Dans une première forme de réalisation du

  
 <EMI ID=5.1> 

  
obtenir un mélange d'Isomères optiques de formule

  

 <EMI ID=6.1> 


  
 <EMI ID=7.1> 

  
obtenir le produit méthylé correspondant de formule
 <EMI ID=8.1> 
 ...........

  
et on déshydrate le produit de fcrmule (III) en ajmaiieine de formule

  

 <EMI ID=9.1> 


  
et épi-19-ajmalicine de formule

  

 <EMI ID=10.1> 


  
Dans une deuxième forme de réalisation du procédé, on effectue la cyclisation de la corynanthéine directement en produit de formule (III) et on transforme

  
 <EMI ID=11.1> 

  
L'ensemble du procéda peut être représenté à l'aide du schéma suivant 
 <EMI ID=12.1> 
  <EMI ID=13.1>  de l'Invention sont atteints de la façon suivante 

  
 <EMI ID=14.1> 

  
 <EMI ID=15.1> 

  
anhydre, puis filtrée et évaporée. 

  
 <EMI ID=16.1> 

  
soude, puis filtrée* on dilue la solution par de l'eau,  puis on évapore le aéthanol par distillation sons vide. 

  
La solution aqueuse est extraite par un solvant non miscible
19 eau tel que le chlorure de méthylène on le chloroforme. 

  
La phase organique est décantée, lavée par de l'eau et 

  
 <EMI ID=17.1> 

  
évaporée. 

  
Dans le troisième stade, le produit il=) tenu

  
 <EMI ID=18.1> 

  
solution aqueuse de carbonate de sodium, puis on "trait par  <EMI ID=19.1> 

  
Pour obtenir chacun de ces produits, le

  
 <EMI ID=20.1> 

  
 <EMI ID=21.1> 

  
 <EMI ID=22.1> 

  
les exemples suivants illustrent de façon

  
 <EMI ID=23.1> 

  
 <EMI ID=24.1>   <EMI ID=25.1> 

  
On agite 1 heure, filtre sur eélite puis on extrait par le chloroforme. Par évaporation à sec, on obtient 5,6 g d'un produit qui aéra méthylé.

  
 <EMI ID=26.1> 

  
 <EMI ID=27.1> 

  
 <EMI ID=28.1> 

  
On porte à reflux 20 heures.

  
Après refroidissement, on alcalinise

  
par la soude, puis on filtre. On concentre la solution

  
puis on extrait par le chlorure de méthylène. La méthylation

  
 <EMI ID=29.1> 

  
 <EMI ID=30.1> 

  
laires.

  
 <EMI ID=31.1> 

  
 <EMI ID=32.1> 

  
on obtient 2,985 g de produit (III), dérivé

  
 <EMI ID=33.1>   <EMI ID=34.1> 

  
Les produits ainsi obtenus sont identi-

  
 <EMI ID=35.1> 

  
brevet principal.

  
 <EMI ID=36.1> 

  
et 50 ml d'eau.

  
 <EMI ID=37.1> 

  
 <EMI ID=38.1> 

  
 <EMI ID=39.1> 

  
et on ajoute goutte à goutte 86 ml de soude caustique 3M. On agita pendant 1 heure, filtre sur célite, puis extrait par le chloroforme. Par évaporation à sec, on obtient 5,875 CI de produit (III) tel que décrit dans la référence de littérature indiquée précéderaient.

  
 <EMI ID=40.1> 

  
On ajoute au mélange issu du stade A

  
 <EMI ID=41.1> 

  
 <EMI ID=42.1>   <EMI ID=43.1> 

  
carbonate de sodium* puis on extrait par l'éther*

  
 <EMI ID=44.1>  <EMI ID=45.1>  <EMI ID=46.1>  <EMI ID=47.1> 

  
 <EMI ID=48.1> 

  
 <EMI ID=49.1> 

  
pal.

  
 <EMI ID=50.1> 



   <EMI ID = 1.1>

  
The present invention relates to a method of

  
 <EMI ID = 2.1>

  
The invention aims to obtain * these * two 'compounds with better yields.

  
To this end, instead of cyclizing the demethylcorynantheine, the cyclization is carried out directly on the

  
 <EMI ID = 3.1>

  
 <EMI ID = 4.1>

  
In a first embodiment of the

  
 <EMI ID = 5.1>

  
obtain a mixture of optical isomers of formula

  

 <EMI ID = 6.1>


  
 <EMI ID = 7.1>

  
obtain the corresponding methylated product of formula
 <EMI ID = 8.1>
 ...........

  
and the product of formula (III) is dehydrated into an additive of formula

  

 <EMI ID = 9.1>


  
and epi-19-ajmalicin of formula

  

 <EMI ID = 10.1>


  
In a second embodiment of the process, the cyclization of corynanthein is carried out directly into the product of formula (III) and

  
 <EMI ID = 11.1>

  
The whole process can be represented using the following diagram
 <EMI ID = 12.1>
  <EMI ID = 13.1> of the Invention are achieved as follows

  
 <EMI ID = 14.1>

  
 <EMI ID = 15.1>

  
anhydrous, then filtered and evaporated.

  
 <EMI ID = 16.1>

  
sodium hydroxide, then filtered * the solution is diluted with water, then the ethanol is evaporated off by vacuum distillation.

  
The aqueous solution is extracted with an immiscible solvent
19 water such as methylene chloride or chloroform.

  
The organic phase is decanted, washed with water and

  
 <EMI ID = 17.1>

  
evaporated.

  
In the third stage, the product he =) held

  
 <EMI ID = 18.1>

  
aqueous sodium carbonate solution, then "treated with <EMI ID = 19.1>

  
To obtain each of these products, the

  
 <EMI ID = 20.1>

  
 <EMI ID = 21.1>

  
 <EMI ID = 22.1>

  
the following examples illustrate how

  
 <EMI ID = 23.1>

  
 <EMI ID = 24.1> <EMI ID = 25.1>

  
Stirred 1 hour, filtered on elite and then extracted with chloroform. By evaporation to dryness, 5.6 g of a product which aerated methyl is obtained.

  
 <EMI ID = 26.1>

  
 <EMI ID = 27.1>

  
 <EMI ID = 28.1>

  
It is brought to reflux for 20 hours.

  
After cooling, alkalinizes

  
by soda, then filtered. We concentrate the solution

  
then extracted with methylene chloride. Methylation

  
 <EMI ID = 29.1>

  
 <EMI ID = 30.1>

  
laires.

  
 <EMI ID = 31.1>

  
 <EMI ID = 32.1>

  
2.985 g of product (III) is obtained, derivative

  
 <EMI ID = 33.1> <EMI ID = 34.1>

  
The products thus obtained are identified

  
 <EMI ID = 35.1>

  
main patent.

  
 <EMI ID = 36.1>

  
and 50 ml of water.

  
 <EMI ID = 37.1>

  
 <EMI ID = 38.1>

  
 <EMI ID = 39.1>

  
and 86 ml of 3M caustic soda are added dropwise. Stirred for 1 hour, filtered through Celite, then extracted with chloroform. By evaporation to dryness, 5.875 CI of product (III) is obtained as described in the literature reference indicated above.

  
 <EMI ID = 40.1>

  
To the mixture resulting from stage A is added

  
 <EMI ID = 41.1>

  
 <EMI ID = 42.1> <EMI ID = 43.1>

  
sodium carbonate * then extracted with ether *

  
 <EMI ID = 44.1> <EMI ID = 45.1> <EMI ID = 46.1> <EMI ID = 47.1>

  
 <EMI ID = 48.1>

  
 <EMI ID = 49.1>

  
pal.

  
 <EMI ID = 50.1>


    

Claims (1)

<EMI ID=51.1> <EMI ID = 51.1> formule <EMI ID=52.1> <EMI ID=53.1> formula <EMI ID = 52.1> <EMI ID = 53.1> pour obtenir le produit méthylé correspondant de formule to obtain the corresponding methylated product of formula <EMI ID=54.1> <EMI ID = 54.1> <EMI ID=55.1> <EMI ID = 55.1> de formule formula <EMI ID=56.1> <EMI ID = 56.1> <EMI ID=57.1> <EMI ID=58.1> <EMI ID=59.1> <EMI ID = 57.1> <EMI ID = 58.1> <EMI ID = 59.1> <EMI ID=60.1> <EMI ID = 60.1> caractérisé en ce qu'on effectue la cyelisation de la corynanthéine directement en produit de formule (III) . characterized in that the cyelization of corynanthein is carried out directly to the product of formula (III). 4. Procédé selon la revendication 2, caractérisé en ce qu'on effectue la cyclisation interne de la corynanthéine de formule (I) en la traitant par le nitrate de mercure. 4. Method according to claim 2, characterized in that the internal cyclization of the corynanthein of formula (I) is carried out by treating it with mercury nitrate. 5. Procédé selon la revendication 4, caractérisé en ce que le traitement au nitrate de mercure se fait dans un solvant tel que le tétrahydrofuranne, le 5. Method according to claim 4, characterized in that the treatment with mercury nitrate is carried out in a solvent such as tetrahydrofuran, <EMI ID=61.1> <EMI ID = 61.1> puis traité à l'aide de borohydrure de sodium sous agitation et filtré, le produit de formule (II) étant ensuite extrait du filtrat. then treated with sodium borohydride with stirring and filtered, the product of formula (II) then being extracted from the filtrate. 6. Procédé selon la revendication 2, caractérisé en ce que le produit de formule (II) est méthylé dans le méthanol en présence d'acide chlorhydrique, par chauffage à reflux, pour donner lieu au produit de formule ÏIII) - 6. Method according to claim 2, characterized in that the product of formula (II) is methylated in methanol in the presence of hydrochloric acid, by heating at reflux, to give rise to the product of formula III) - 7. Procédé selon la revendication 6, caractérisé en ce que la solution méthanolique est alcalinisée puis filtrée, diluée à l'eau, débarrassée du méthanol par distillation sous vide, la solution aqueuse ainsi obtenue étant soumise à une extraction pour isoler le produit de formule (III) . 7. Method according to claim 6, characterized in that the methanolic solution is basified and then filtered, diluted with water, freed from methanol by vacuum distillation, the aqueous solution thus obtained being subjected to extraction to isolate the product of formula (III). 8. Procédé selon la revendication 3, caractérisé en ce qu'on traite la corynanthéine par du trifluoroacétate de mercure. 8. Method according to claim 3, characterized in that the corynantheine is treated with mercury trifluoroacetate. 9. Procédé selon la revendication 8, caractérisé en ce que le traitement au trifluoroacétate 9. The method of claim 8, characterized in that the treatment with trifluoroacetate de mercure se fait en solution dans le tétrahydrofuranne sous agitation, la solution étant ensuite alcalinisée à of mercury is made in solution in tetrahydrofuran with stirring, the solution then being alkalinized to <EMI ID=62.1> <EMI ID=63.1> <EMI ID = 62.1> <EMI ID = 63.1> <EMI ID=64.1> <EMI ID = 64.1> revendications 2 et 3, caractérisé en ce que le produit de claims 2 and 3, characterized in that the product of <EMI ID=65.1> <EMI ID = 65.1> rique. rique. <EMI ID=66.1> <EMI ID = 66.1> <EMI ID=67.1> <EMI ID = 67.1> dans un solvant tel que le dioxanne ou le diglyme est addi- in a solvent such as dioxane or diglyme is added <EMI ID=68.1> <EMI ID = 68.1> <EMI ID=69.1> <EMI ID = 69.1> extraction à l'éther. ether extraction. <EMI ID=70.1> <EMI ID = 70.1> <EMI ID=71.1> <EMI ID = 71.1> sont isolées par deux recristallisations successives du résidu d'extraction. are isolated by two successive recrystallizations of the extraction residue.
BE162618A 1975-12-10 1975-12-10 PROCESS FOR THE PREPARATION OF OPTICALLY ACTIVE AJMALICIN AND EPI-19-AJMALICIN BE836488R (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE162618A BE836488R (en) 1975-12-10 1975-12-10 PROCESS FOR THE PREPARATION OF OPTICALLY ACTIVE AJMALICIN AND EPI-19-AJMALICIN

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE162618A BE836488R (en) 1975-12-10 1975-12-10 PROCESS FOR THE PREPARATION OF OPTICALLY ACTIVE AJMALICIN AND EPI-19-AJMALICIN
BE836488 1975-12-10

Publications (1)

Publication Number Publication Date
BE836488R true BE836488R (en) 1976-04-01

Family

ID=25649004

Family Applications (1)

Application Number Title Priority Date Filing Date
BE162618A BE836488R (en) 1975-12-10 1975-12-10 PROCESS FOR THE PREPARATION OF OPTICALLY ACTIVE AJMALICIN AND EPI-19-AJMALICIN

Country Status (1)

Country Link
BE (1) BE836488R (en)

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: OMNIUM CHIMIQUE S.A.

Effective date: 19861231

RE Patent lapsed

Owner name: OMNIUM CHIMIQUE S.A.

Effective date: 19881231