CA1127654A - Optically active ethers used for resolution of (r,s) -cyano 3-phenoxy benzyl alcohols - Google Patents

Optically active ethers used for resolution of (r,s) -cyano 3-phenoxy benzyl alcohols

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Publication number
CA1127654A
CA1127654A CA387,832A CA387832A CA1127654A CA 1127654 A CA1127654 A CA 1127654A CA 387832 A CA387832 A CA 387832A CA 1127654 A CA1127654 A CA 1127654A
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Prior art keywords
cyano
alcohol
phenoxy
dimethyl
hexan
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French (fr)
Inventor
Jacques Martel
Andre Teche
Jean Tessier
Jean-Pierre Demoute
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Sanofi Aventis France
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Roussel Uclaf SA
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Abstract

L'invention concerne le mélange racémique de (1R,5S) 6,6-diméthyl 4 (R) ¢(S)-cyano (3'-phénoxyphényl) méthoxy! 3-oxabicyclo (3.1.0) hexan-2-one et de (1R,5S) 6,6diméthyl 4(R) ¢(R)-cyano (3'-phénoxyphényl) méthoxy! 3oxabicyclo (3.1.0) hexan-2-one. L'invention concerne également chacun de ces deux énantiomères individuellement. Les produits selon l'invention s'avèrent particulièrement utiles pour l'obtention de l'alcool (S)-cyano 3-phénoxy benzylique qui est lui-même un intermédiaire permettant d'accéder à des esters correspondant ayant des propriétés insecticides.The invention relates to the racemic mixture of (1R, 5S) 6,6-dimethyl 4 (R) ¢ (S) -cyano (3'-phenoxyphenyl) methoxy! 3-oxabicyclo (3.1.0) hexan-2-one and from (1R, 5S) 6,6 dimethyl 4 (R) ¢ (R) -cyano (3'-phenoxyphenyl) methoxy! 3oxabicyclo (3.1.0) hexan-2-one. The invention also relates to each of these two enantiomers individually. The products according to the invention prove to be particularly useful for obtaining the alcohol (S) -cyano 3-phenoxy benzyl which is itself an intermediate allowing access to corresponding esters having insecticidal properties.

Description

~1~76~;~

Ceci est une division de la demande de brevet canadien n 320,.519 déposée le 30 juin 1979.
L'invention a plus précisément pour objet, en tant que produits industriels nouveaux les produits don-t les noms suivent:
- le mélange de llR,5S) 6,6 diméthyl 4IR) ~S)-cyano (3'-phénoxyphényl~méthoxy~ 3-oxabicyclo (3.1.0) hexan-2-one et de (lR,5S) 6,6-diméthyl 4(R~ ~(R)-cyano (3'~phénoxyphényl)-méthoxy~ 3-oxabicyclo (3.1.0) hexan-2-one.
- le (lR,5S) 6,6-diméthyl 4(R) ~(S) cyano (3'-phénoxy-phényl)méthoxyJ 3-oxabicyclo (3.1.0) hexan-2-oneO
- le (lR,5S) 6,6-diméthyl 4(R) ~(R)-cyano (3'phénoxy-phényl)méthoxy~ 3-oxabi.cyclo (3.1.0) hexan-2-one.
Les produits selon l'invention s'avèrent particu-l:i.erement utiles à titre d'intermédiaire réactionnel dans un procédé de dédoublement de l'alcool ~S) ~-cyano 3-phénoxy henzylique de formule (I):
CN
HO I ~ ~ (I) t du (R,S) a-cyano 3-phénoxy benzylique qui est un produit ra-cémique. Mais il n'existait, à ce jour, aucune publication décrivant l'alcool (S) ~-cyano 3-phenoxy benzylique ou son obtention.
Il existait, il est vrai, des procédés de dédouble-ment d'alcools comportant des carbones asymétriques.
Par exemple, on savait dédoubler certains alcools racémiques (R,S), en les combinant avec un acide organique optiquement actif, en séparant par un traitement physique convenable l'ester d'alcool ~S) et l'ester d'alcool ~R?, résultant, puis en hydrolysant ces deux esters pour obtenir . . .

les alcools de structure (R) et de structure (S).
On connaissait également un procede plus complique consistant ~ dedoubler des alcools racemiques (R,S) en les combinant ~ un diacide organique, en ~aisan~ reagir l'hemiest~r resultant, avec une base optiquement active, en separant par voie physique, les deux sels de base optiquement active resul-tants, pour obtenir le sel de base optiquement active de l'hemiester d'alcool de structure (S) et le sel de base opti-quement active de l'hemiester d'alcool de structure (R), ~
acidi~ier pour liberer les hemiesters d'alcool (S) et d'alcool (R) puis a hydrolyser ces hemiesters pour obtenir l'alcool de structure (S) et l'alcool de structure (R).
Ces methodes connues de dedoublement des alcools comportent, comme stade intermediaire, la ~ormation d'esters.
Dans l'e-tape finale de dedoublement, il est necessaire d'hydrolyser ces esters pour obtenir l'alcool dedouble desire. Il s'est avéré, dans le cas de l'alcool ~-cyano 3-phenoxy benzylique que, lorsqu'on effectue l'hydrolyse des esters de cet alcool, en milieu acide ou basi~ue, on n'obtient pas l'alcool dedoublé desire mais des produits de degradation de ce dernier, en particulier l'aldehyde 3-phenoxy benzolque e-t l'acide 2-hydroxy 2(3-phénoxy)phenyl acetique~
Il n'existait donc à ce jour aucun procedé de dedoublement permettant d'obtenir l'alcool (S) ~-cyano 3-phenoxy benzylique. -Or, dans le procede qui recemment a ete mis au point dans la demande dlorigine pour la preparation de l'alcool (S) ~-cyano 3-phenoxy benzylique, une des caracteristiques importantes de ce procede consiste à preparer un ether inter-mediaire optiquement acti~ selon la présente invention, soit le (lR,5S) 6,6-dimethyl 4(R) ~ S)-cyano (3'-phenoxy phenylj methoxy~ 3-oxabicyclo (3.1.0) hexan-2-one. Contrairement 6~f~

aux esters utilisés classiquement pour dedoubler les alcools, cet ether possède une structure qui rend aisee son hydrolyse en milieu acide, ce qui permet d'obtenir l'alcool recherche.
De plus, cette obtention se realise avec un bon rendement.
Grâce a la mise en oeuvre de produit intermediaire selon l'invention il a eté permis de trou~er que cet alcool de configuration S possède un pouvoir rotatoire negatifO C'est ainsi que, mesure dans le benzène, a une concentration voisine de 0,8%, ce pouvoir rotatoire a une valeur de l'ordre de - 16,5 + 1,5.
En plus, ce nouveau procede de dedoublement d'alcool mettant en oeuvre un intermediaire selon l'invention a plus particulièrement permis l'obtention de l'alcool ~S) ~-cyano 3-phenoxy benzylique ~ l'état sensiblement pur ou à l'é-tat pur et notamment l'alcool (S) ~-cyano 3-phénoxy benzylique dont le pouvoir rotatoire, mesuré dans le ben~ène à une concentration approxima-tive de 0,~%, est d'environ -16,5.
Bien entendu, de ce qui précede, il est egalement possible d'acceder ~ l'alcool (R) ~-cyano 3-phenoxy benzylique par hydrolyse de l'ether optiquement actif correspondant.
Plus precisement, les inte~mediaires selon l'in-vention sontprepares par la reaction de l'alcool (R,S) ~-cyano 3-phenoxy benzylique, en présence d'un agent acide, avec la lactone de l'acide cis 2,2-dimethyl 3 S-(dihydroxyméthyl) cyclopropane-lR-carboxylique pour obtenir un melange de (lR,5S) 6,6-dimethyl 4~R) ~ S)-cyano (3'-phenoxyphenyl) methoxy~ 3-oxabicyclo (3.1.0) hexan-2-one et de (lR,5S) 6,6-dimethyl 4(R) L(R) -cyano (3'-phénoxyphenyl) methoxy~ 3-oxabicyclo (3.1.0) hexan-2-one. Les deux isomères de cek intermediaire racemique sont ~r la suite separes par un ~oyen physique. En~in, l'on peut notamment hydrolyser en mi:Lieu acide le (lR,5S) 6,6-dimethyl (4R) ~(S)-cyano (3'-phénoxy-,9 ~ J~ ~ ~ I
3~: ~

phenyl) methoxy~ 3-oxabicyclo (3.1.0) hexan-2-one resultant pour obtenir l'alcool (S) N-cyano 3-phenoxy benzylique.
L'agent acide en presence duquel on fait réagir 1alcool et le composé lactonique est choisi notamment dans le groupe constitue par l'acide paratoluenesulfonique, l'acide methane sulfonique, l'acide perchlorique~ l'acide metanitro benzène sulfonique, l'acide 5-sulfo salicyclique et l'acide camphosulfonique.
Le (lR,5S) ~,6-dimethyl 4(R) f(s)-cyano (3'-phénoxy-phényl) méthoxy~ 3-oxabicyclo 13.1.0) hexan-2-one peut ëtre separe de son isomare, le (lR,5S) 6,6-dimethyl ~R) ~(R)-cyano (3'-phenoxyphenyl) méthox ~ 3-oxabicyclo (3.1.0) hexan-2-one par cristall.isation dans un solvant ou par chromatographie.
Cette separation peut etre effectuée d'une façon par-ticulièrement commode par chromato~raphie sur colonne de silice.
Comme acide pour effectuer l'hydrolyse finale du (lR,5S) 6,6-diméthyl ~(~) f(s)-cyano (3'-phénoxyphényl) methoxy~
3 oxabicyclo (3.1.0) hexan-2-one on peut utiliser avantageu-sement l'acide paratoluenesulfonique.
En purifiant l'alcool par chromatographie sur gel de silice et en eluant par un mélange de benzène et d'acetate d'ethyle (9/1?, il a e-te obtenu un alcool (S) ~-cyano 3-~phenoxy benzylique de f~lD = -16,5 ~ 1,5 (c = 0~%, benzène).
Les produits intermediaires selon l'invention per-mettant de separer l'alcool (S) ~-cyano 3-phénoxy benzylique s'avèrent d'une très ~rande importan~e en ce que Ledit alcool est un produit très utile sur le plan industriel. Il est connu, en effet, dans le domaine des composes pyrethrinoldes, que les esters d'acides cyclopropane carboxyliques d'alcool (S) ~-cyano 3-phenoxy benzylique possèdent, en general, une activite insecticide beaucoup plus elevee que les esters d'alcool (R) correspondants.

- .:

Or l'alcool (S) ~-cyano 3-phenoxy benzylique permet notamment, d'accéder à son es-ter, par simple esterification avec l'acide lR cis 2,2-dimethyl 3-(2',2'-dibromovinyll-cyclopropane-l-carboxylique, qui est un compose bien connu pour son activite insecticide remarquable.
Les produits intermediaires selon l'invention con-tribuent donc à faciliter l'acces à la preparation de l'ester de l'alcool (S) a-cyano 3-phenoxy benzylique avec l'acide lR cis 2,2-diméthyl 3-(2',2'-dibromovinyl)cyclopropane-1-carboxylique, preparation qui est caracterisee en ce quel'on fait reagir cet alcool (S) ~-cyano 3-phenoxy benzylique avec l'acide lR cis 2,2-diméthyl 3-(2',2'-dibromovinyl)-cyclopropane-l-carboxylique ou l'un de ses derives fonc-tionnels, au sein d'un solvant organique, pour obten:ir l'ester de l'alcool (S) ~-cyano 3-phenoxy benzylique de l'acide lR cis 2,2-dimethyl 3-(2',2'-dibromovinyl)cyclo-propane-l-carboxylique.
De plus, toujours grace aux intermediaires selon l'invention des esters d'alcools (S) ~-cyano 3-phenoxy benzylique qui cependant n'ont pu etre prepares à ce jour, faute de disposer d'alcool cle configuration ~S) sont mainte-nant accessibles. C'est ainsi, par exemple, que l'ester d'alcool (S) ~-cyano 3-phénoxy benzylique de l'acide D~
~ 1 ~ 76 ~; ~

This is a division of the patent application No. 320, .519 filed June 30, 1979.
The subject of the invention is more precisely, as that new industrial products the products don the names follow:
- the mixture of llR, 5S) 6.6 dimethyl 4IR) ~ S) -cyano (3'-phenoxyphenyl ~ methoxy ~ 3-oxabicyclo (3.1.0) hexan-2-one and (1R, 5S) 6,6-dimethyl 4 (R ~ ~ (R) -cyano (3 '~ phenoxyphenyl) -methoxy ~ 3-oxabicyclo (3.1.0) hexan-2-one.
- (lR, 5S) 6,6-dimethyl 4 (R) ~ (S) cyano (3'-phenoxy-phenyl) methoxyJ 3-oxabicyclo (3.1.0) hexan-2-oneO
- (lR, 5S) 6,6-dimethyl 4 (R) ~ (R) -cyano (3'phenoxy-phenyl) methoxy ~ 3-oxabi.cyclo (3.1.0) hexan-2-one.
The products according to the invention prove to be particularly l: i.e. useful as a reaction intermediate in a alcohol splitting process ~ S) ~ -cyano 3-phenoxy henzyl of formula (I):
CN
HO I ~ ~ (I) t (R, S) a-cyano 3-phenoxy benzyl which is a ra-cemic. But there was, to date, no publication describing the alcohol (S) ~ -cyano 3-phenoxy benzyl or its obtaining.
There were, it is true, procedures for splitting ment of alcohols containing asymmetric carbons.
For example, we knew how to split certain alcohols racemic (R, S), combining them with an organic acid optically active, separating by physical treatment suitable the alcohol ester ~ S) and the alcohol ester ~ R?
resulting, then by hydrolyzing these two esters to obtain . . .

alcohols of structure (R) and of structure (S).
We also knew a more complicated process consisting in splitting racemic alcohols (R, S) by combining ~ an organic diacid, in ~ aisan ~ reacting the hemiest ~ r resulting, with an optically active base, separating by physical route, the two optically active base salts result tants, to obtain the optically active base salt of the alcohol hemiester of structure (S) and the base salt opti-only active of the alcohol hemiester of structure (R), ~
acidify to release the alcohol (S) and alcohol hemiesters (R) then hydrolyze these hemiesters to obtain alcohol of structure (S) and alcohol of structure (R).
These known methods of splitting alcohols include, as an intermediate stage, the ~ ormation of esters.
In the final duplication e-tape, it is necessary hydrolyze these esters to obtain double alcohol longed for. It turned out, in the case of alcohol ~ -cyano 3-benzyl phenoxy that when hydrolysis of esters of this alcohol, in an acidic or basic environment, we do not obtain not the desired split alcohol but degradation products of the latter, in particular the aldehyde 3-phenoxy benzolque and 2-hydroxy 2 (3-phenoxy) phenyl acetic acid ~
There was therefore to date no method of splitting to obtain alcohol (S) ~ -cyano 3-benzyl phenoxy. -However, in the process which has recently been perfected in the original application for the preparation of alcohol (S) ~ -cyano 3-phenoxy benzyl, one of the characteristics important of this process is to prepare an ether inter-optically active medi ~ according to the present invention, either (lR, 5S) 6,6-dimethyl 4 (R) ~ S) -cyano (3'-phenoxy phenylj methoxy ~ 3-oxabicyclo (3.1.0) hexan-2-one. In contrary 6 ~ f ~

esters conventionally used to split alcohols, this ether has a structure which makes its hydrolysis easy in an acid medium, which makes it possible to obtain the alcohol sought.
In addition, this obtaining is carried out with a good yield.
Thanks to the implementation of intermediate product according to the invention it was allowed to hole ~ er that this alcohol configuration S has negative rotary power O This is how that, measured in benzene, has a concentration close to 0.8%, this rotary power has a value of the order of - 16.5 + 1.5.
In addition, this new process for splitting alcohol using an intermediary according to the invention more particularly allowed obtaining alcohol ~ S) ~ -cyano Benzyl 3-phenoxy ~ substantially pure or as-is pure and in particular alcohol (S) ~ -cyano 3-phenoxy benzyl whose rotary power, measured in the ben ~ ene at a approximate concentration of 0, ~%, is about -16.5.
Of course, from the above, it is also possible to access ~ alcohol (R) ~ -cyano 3-phenoxy benzyl by hydrolysis of the corresponding optically active ether.
More precisely, the intermediaries according to the vention are prepared by the reaction of alcohol (R, S) ~ -cyano Benzyl 3-phenoxy, in the presence of an acid agent, with the cis 2,2-dimethyl 3 S- lactone (dihydroxymethyl) cyclopropane-1R-carboxylic to obtain a mixture of (lR, 5S) 6,6-dimethyl 4 ~ R) ~ S) -cyano (3'-phenoxyphenyl) methoxy ~ 3-oxabicyclo (3.1.0) hexan-2-one and de (lR, 5S) 6,6-dimethyl 4 (R) L (R) -cyano (3'-phenoxyphenyl) methoxy ~ 3-oxabicyclo (3.1.0) hexan-2-one. The two isomers of cek racemic intermediary are ~ r afterwards separated by a ~ oyen physical. In ~ in, one can in particular hydrolyze in mid: Location acid (lR, 5S) 6,6-dimethyl (4R) ~ (S) -cyano (3'-phenoxy-, 9 ~ J ~ ~ ~ I
3 ~: ~

phenyl) methoxy ~ 3-oxabicyclo (3.1.0) hexan-2-one resulting to obtain the benzyl alcohol (S) N-cyano 3-phenoxy.
The acid agent in the presence of which one reacts 1 alcohol and the lactonic compound is chosen in particular in the group consists of paratoluenesulfonic acid, acid methane sulfonic, perchloric acid ~ metanitro acid benzene sulfonic, 5-sulfo salicyclic acid and acid camphor sulfonic.
Le (lR, 5S) ~, 6-dimethyl 4 (R) f (s) -cyano (3'-phenoxy-phenyl) methoxy ~ 3-oxabicyclo 13.1.0) hexan-2-one can be separates from its isomare, the (lR, 5S) 6,6-dimethyl ~ R) ~ (R) -cyano (3'-phenoxyphenyl) methox ~ 3-oxabicyclo (3.1.0) hexan-2-one by crystallization in a solvent or by chromatography.
This separation can be carried out in a par-particularly convenient by chromatography ~ raffia on a silica column.
As an acid to effect the final hydrolysis of (lR, 5S) 6,6-dimethyl ~ (~) f (s) -cyano (3'-phenoxyphenyl) methoxy ~
3 oxabicyclo (3.1.0) hexan-2-one can be advantageously used paratoluenesulfonic acid.
By purifying the alcohol by chromatography on gel of silica and eluting with a mixture of benzene and acetate of ethyl (9/1?, did he get an alcohol (S) ~ -cyano 3- ~ phenoxy benzyl of f ~ lD = -16.5 ~ 1.5 (c = 0 ~%, benzene).
The intermediate products according to the invention per-putting to separate alcohol (S) ~ -cyano 3-phenoxy benzyl prove to be of very great import in that said alcohol is a very useful product on the industrial level. He is known, indeed, in the field of pyrethrinold compounds, that esters of cyclopropane carboxylic acids of alcohol (S) ~ -cyano 3-phenoxy benzyl have, in general, a much higher insecticidal activity than esters corresponding alcohol (R).

-.:

Or alcohol (S) ~ -cyano 3-phenoxy benzyl allows in particular, to access its es-ter, by simple esterification with lR cis 2,2-dimethyl 3- (2 ', 2'-dibromovinyll-cyclopropane-l-carboxylic, which is a good compound known for its remarkable insecticidal activity.
The intermediate products according to the invention therefore help facilitate access to the preparation of the ester benzyl alcohol (S) a-cyano 3-phenoxy with acid lR cis 2,2-dimethyl 3- (2 ', 2'-dibromovinyl) cyclopropane-1-carboxylic, preparation which is characterized in that this alcohol (S) ~ -cyano 3-phenoxy benzyl is reacted with lR cis 2,2-dimethyl 3- (2 ', 2'-dibromovinyl) acid -cyclopropane-l-carboxylic acid or one of its derivatives tional, within an organic solvent, to obtain: ir the alcohol ester (S) ~ -cyano 3-phenoxy benzyl of lR cis 2,2-dimethyl 3- (2 ', 2'-dibromovinyl) cyclo- acid propane-1-carboxylic.
In addition, always thanks to the intermediaries according to the invention of alcohol esters (S) ~ -cyano 3-phenoxy benzyl which however could not be prepared to date, if there is no alcohol in the configuration ~ S) are now nant accessible. This is how, for example, the ester alcohol (S) ~ -cyano 3-phenoxy benzylic acid D ~

2-isopropyl 2-parachlorophenyl acetique, etait jusqu'à ce jour impossible à obtenir. Grace à la presente invention, par esterification de l'alcool (S) ~-cyano 3-phenoxy benzilique a l'aide du chlorure de l'acide D)> 2-isopropyl 2-parachlorophenyl acetique, il est maintenant aise de preparer ce compose, qui s'est avere posseder d'excellentes proprietes insecticides.
Enfin, il est a mentionner que l'alcool (S) ~-cyano
2-isopropyl 2-parachlorophenyl acetate, was until day impossible to obtain. Thanks to the present invention, by esterification of alcohol (S) ~ -cyano 3-phenoxy benzilic using acid chloride D)> 2-isopropyl 2-parachlorophenyl acetate, it is now easy to prepare this compound, which turned out to have excellent properties insecticides.
Finally, it should be mentioned that alcohol (S) ~ -cyano

3-phenoxy benzylique, lorsque obtenu selon un procéde mettant en oeuvre les intermediaires selon l'invention presente un ~5--caractere économiquement avantageux ainsi que marqué d'origi-nalité. L'obtention de cet alcool autorise de plus la pré-paration d'esters insecticides très acti~s et pour certains desquels on ne connaissait, jusqu'ici, aucune voie d'acces.
Les exemples suivants illustrent l'invention sans toutefois la limiter.
EXEMPLE 1: Preparation et applications des intermédiaires : . ~
selon l'invention pour l'obtention de l'alcool (S~`a-cyano 3-phénoxy benzyli~ue Stade 1: Mélange de (lRL5S~ 6L6-diméthyl 4~R) ((S)-cyano _______ _____ ________ _____ ________ ____________ ___ (3'-~hénoxy phenyl) méthoxy) 3-oxa blcyclo (3.1.0) ____ __ __ _ ___ _________ ___________ ___________ , hexan-2-one et de (lRL5S) 6,6-dimethyl 4(R)((R)-cyano (3'-ehenoxy ~henyl) methoxy) 3-oxa bicyclo 13 1.0) hexan-2-one.
_:_____________.___ On melange 22,5 g d'alcool (R,S) a-cyano 3-phénoxy benzylique, 9,46 g de lactone de l'acide cis 2,2-diméthyl 3S-(dihydroxy methyl) cyclopropan-lR-carboxylique, 0,150 g d'acide paratoluene sulfonique monohydrate, porte ~ 80C sous un vide de 10 ~mm de mercure, maintient le mélange réactionnel pendant 2 heures dans ces conditions, lleau formée étant éli-minee par distillation. On refroidi~ à 20C et obtient 30r70 g de melange brut de (lR,5S) 6,6-dimethyl 4(R) ((S)-cyano (3'-phenoxy phenyl) methoxy) 3-oxabicyclo (3.1.0) hexan-2-one et de (lR,55) 6,6-diméthyl 4(R) ((R)-cyano (3'-phenoxy phenyl) methoxy) 3-oxabicyclo (3.1.0) hexan-2-one (contenant co~e impuretes principalement les produits de depart n'ayant pas reagi~ (melanye A).
Stade B- (lR 5S) 6 6-dimethyl 4(R) ((S)-cyano (3'-~henoxy _______- ___L_____L________ ____--_------ -------- ----- .

~henyl methoxy) 3-oxa bicyclo (3 1.0) hexan_2-one. ;;

On chromatographie le melange A obtenu au stade A sur gel de silice, en eluant par un melange de benzène et d'acetate d'ethyle (95/5) et obtient 10,9 g de (lR,5S) -~

. . . : :~: , 76~i~

6,6-dimethyl 4(R) ((S) cyano 13'-phenoxy phenyl) méthoxy) 3-oxa bicyclo (3.1.0) hexan-2 one.
F - 126C~ D = ~ 71(c = 1~, benzene Spectre ultra violet (ethanol) Inflexion à 226 nm (E' = 319), inflexion à 267 nm ~E' = 52), inflexion a 271 nm (E' - 56), maximum a 276 nm (E' = 60), inflexion ~ 280 nm (E = ~8).
Dichrolsme circulaire (dioxane) ~ ,2 a 2?5 nm (max) ~ = +0,39 a 287 nm (max) Spectre de R M.N. (deutero chloroforme) Pics a 1,18 - 1,23 ppm caracteristiques des hydrogenes des methyles gémines, pics à 1,98 - 2,08 et 2,15 - 2,25 ppm caracteristiques des hydrogenes du cyclopropyle; pics a 5,53 - 5,56 ppm caracteristiques de l'hydrogene porte par le même carbone que le groupement nitrile, et de lihydrogene en position ~, pics a 6,91 - 7,25 ppm caracteristiques des hydrogenes des noyaux aromatiques.
Stade C: Alcool (S) ~-cyano meta~henox~ benzyli~ue.
Dans un melange de 100 cm3 de dioxane, de 50 cm3 dleau, on introduit 10 g de (lR,5S) 6,6-dimethyl 4(R) (tS) cyano (3'-phénoxy phényl) méthoxy) 3-oxabicyclo (3.1.0) hexan-2-one, obtenu au stade B de l'exemple 1, puis 1 g dlacide paratoluene sulfonique monohydrate, porte le melange reac-tionnel au reflux, l'y maintient pendant 23 heures, concentre par distillation sous pression réduite, jusqu'à obtenir la moitié du volume initial, ajoute de l'ether ethylique, agite, separe, la concentre a sec par distillation sous pression reduite, chromotagraphie le residu (9,5 g) sur gel de silice, en éluant avec un melange de benzène et d'acétate d'éthyle (9/1.) et obtient 6,1 g d'alcool (S) ~-cyano métaphénoxy benæylique ~ D = -16,5 ~ 1,5 (c = 0,8%, benzène).
Spectre de RMN (deutero chloroforme) Pic à 3,25 ppm caractéristique de l'hydrogene de la fonction alcool, pic à 5,42 ppm caractéristique de l'hydrogene porte par le meme carbone que le groupement nitrile. ~ `
~.

~ .
Benzyl 3-phenoxy, when obtained according to a process the intermediaries according to the invention have a ~ 5--economically advantageous as well as marked with origi-nality. Obtaining this alcohol also authorizes the pre-treatment of highly active insecticidal esters, some of them of which no route has been known so far.
The following examples illustrate the invention without however limit it.
EXAMPLE 1: Preparation and applications of intermediates :. ~
according to the invention for obtaining alcohol (S ~ `a-cyano 3-phenoxy benzyli ~ ue Stage 1: Mixture of (lRL5S ~ 6L6-dimethyl 4 ~ R) ((S) -cyano _______ _____ ________ _____ ________ ____________ ___ (3'- ~ henoxy phenyl) methoxy) 3-oxa blcyclo (3.1.0) ____ __ __ _ ___ _________ ___________ ___________, hexan-2-one and (lRL5S) 6,6-dimethyl 4 (R) ((R) -cyano (3'-ehenoxy ~ henyl) methoxy) 3-oxa bicyclo 13 1.0) hexan-2-one.
_: _____________.___ 22.5 g of alcohol (R, S) a-cyano 3-phenoxy are mixed benzyl, 9.46 g cis 2,2-dimethyl 3S- lactone (dihydroxy methyl) cyclopropan-lR-carboxylic, 0.150 g paratoluene sulfonic acid monohydrate, door ~ 80C under a vacuum of 10 ~ mm of mercury, maintains the reaction mixture for 2 hours under these conditions, the water formed being eli-distilled. Cooled ~ to 20C and obtains 30r70 g of crude mixture of (lR, 5S) 6,6-dimethyl 4 (R) ((S) -cyano (3'-phenoxy phenyl) methoxy) 3-oxabicyclo (3.1.0) hexan-2-one and (1R, 55) 6,6-dimethyl 4 (R) ((R) -cyano (3'-phenoxy phenyl) methoxy) 3-oxabicyclo (3.1.0) hexan-2-one (containing co ~ e impurities mainly the starting products having no not reacted ~ (melanye A).
Stage B- (lR 5S) 6 6-dimethyl 4 (R) ((S) -cyano (3'- ~ henoxy _______- ___L_____L________ ____ - _------ -------- -----.

~ henyl methoxy) 3-oxa bicyclo (3 1.0) hexan_2-one. ;;

The mixture A obtained in stage is chromatographed A on silica gel, eluting with a mixture of benzene and ethyl acetate (95/5) and obtains 10.9 g of (lR, 5S) - ~

. . . :: ~:, 76 ~ i ~

6,6-dimethyl 4 (R) ((S) cyano 13'-phenoxy phenyl) methoxy) 3-oxa bicyclo (3.1.0) hexan-2 one.
F - 126C ~ D = ~ 71 (c = 1 ~, benzene Ultra violet spectrum (ethanol) Inflection at 226 nm (E '= 319), inflection at 267 nm ~ E '= 52), inflection at 271 nm (E' - 56), maximum at 276 nm (E '= 60), inflection ~ 280 nm (E = ~ 8).
Circular dichrolsm (dioxane) ~, 2 to 2? 5 nm (max) ~ = +0.39 at 287 nm (max) R MN spectrum (deutero chloroform) Peaks at 1.18 - 1.23 ppm characteristic of hydrogen gemine methyls, peaks at 1.98 - 2.08 and 2.15 - 2.25 ppm characteristics of cyclopropyl hydrogen; picks a 5.53 - 5.56 ppm characteristics of the hydrogen carried by the same carbon as the nitrile group, and hydrogen in position ~, peaks at 6.91 - 7.25 ppm characteristic of hydrogenes of aromatic rings.
Stage C: Alcohol (S) ~ -cyano meta ~ henox ~ benzyli ~ eu.
In a mixture of 100 cm3 of dioxane, of 50 cm3 water, 10 g of (lR, 5S) 6,6-dimethyl 4 (R) (tS) are introduced cyano (3'-phenoxy phenyl) methoxy) 3-oxabicyclo (3.1.0) hexan-2-one, obtained in stage B of Example 1, then 1 g of acid paratoluene sulfonic monohydrate, carries the reac-reflux, keeps it there for 23 hours, concentrates by distillation under reduced pressure, until the half of the initial volume, add ethyl ether, stir, separates, concentrates dry by distillation under pressure reduced, chromotagraphy the residue (9.5 g) on silica gel, eluting with a mixture of benzene and ethyl acetate (9/1.) And obtains 6.1 g of alcohol (S) ~ -cyano metaphenoxy benæylic ~ D = -16.5 ~ 1.5 (c = 0.8%, benzene).
NMR spectrum (deutero chloroform) 3.25 ppm peak characteristic of hydrogen alcohol function, peak at 5.42 ppm characteristic of hydrogen carries by the same carbon as the group nitrile. ~ `
~.

~.

Claims (2)

Les réalisations de l'invention, au sujet desquelles un droit exclusif de propriété ou de privilège est revendiqué, sont définies comme il suit: The embodiments of the invention, about which an exclusive right of property or privilege is claimed, are defined as follows: 1. A titre de produits industriels nouveaux:
- le mélange de (1R,5S) 6,6-diméthyl 4(R) [(S)-cyano (3'-phénoxyphényl) méthoxy] 3-oxabicyclo (3.1.0) hexan-
1. As new industrial products:
- the mixture of (1R, 5S) 6,6-dimethyl 4 (R) [(S) -cyano (3'-phenoxyphenyl) methoxy] 3-oxabicyclo (3.1.0) hexan-
2-one et de (1R,5S) 6,6-diméthyl 4(R) [(R)-cyano (3'-phénoxy-phényl) méthoxy] 3-oxabicyclo (3.1.0) hexan-2-one;
- le (1R,5S) 6,6-diméthyl 4(R) [(S)-cyano (3'-phénoxyphényl) méthoxy] 3-oxabicyclo (3.1.0) hexan-2-one; et - le (1R,5S) 6,6 diméthyl 4(R) [(R)-cyano (3'-phénoxyphényl) méthoxy] 3-oxabicyclo (3.1.0) hexan-2-one.
2-one and (1R, 5S) 6,6-dimethyl 4 (R) [(R) -cyano (3'-phenoxy-phenyl) methoxy] 3-oxabicyclo (3.1.0) hexan-2-one;
- (1R, 5S) 6,6-dimethyl 4 (R) [(S) -cyano (3'-phenoxyphenyl) methoxy] 3-oxabicyclo (3.1.0) hexan-2-one; and - (1R, 5S) 6.6 dimethyl 4 (R) [(R) -cyano (3'-phenoxyphenyl) methoxy] 3-oxabicyclo (3.1.0) hexan-2-one.
CA387,832A 1978-01-31 1981-10-13 Optically active ethers used for resolution of (r,s) -cyano 3-phenoxy benzyl alcohols Expired CA1127654A (en)

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CA387,832A CA1127654A (en) 1978-01-31 1981-10-13 Optically active ethers used for resolution of (r,s) -cyano 3-phenoxy benzyl alcohols

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Application Number Priority Date Filing Date Title
FR78-02621 1978-01-31
FR7802621A FR2421875A1 (en) 1978-01-31 1978-01-31 OPTICALLY ACTIVE SUBSTITUTE BENZYL ALCOHOL AND ITS PREPARATION PROCESS
CA320,519A CA1125310A (en) 1978-01-31 1979-01-30 Process for the preparation of optically active substituted benzyl alcohol
CA387,832A CA1127654A (en) 1978-01-31 1981-10-13 Optically active ethers used for resolution of (r,s) -cyano 3-phenoxy benzyl alcohols

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