DE2122822A1 - Insecticidally active 5-benzyl-furan-3-hydroxymethyl - chrysanthemate - prepd from benzyloxazoles and propargyl chrysanthemo - Google Patents

Insecticidally active 5-benzyl-furan-3-hydroxymethyl - chrysanthemate - prepd from benzyloxazoles and propargyl chrysanthemo

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Publication number
DE2122822A1
DE2122822A1 DE19712122822 DE2122822A DE2122822A1 DE 2122822 A1 DE2122822 A1 DE 2122822A1 DE 19712122822 DE19712122822 DE 19712122822 DE 2122822 A DE2122822 A DE 2122822A DE 2122822 A1 DE2122822 A1 DE 2122822A1
Authority
DE
Germany
Prior art keywords
benzyl
furan
chrysanthemate
hydroxymethyl
propargyl
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
DE19712122822
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German (de)
Inventor
Volkmar Dr. 6800 Mannheim; König Horst Dr. 6700 Ludwigshafen. C07d 5-16 Weberndorfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
Badische Anilin and Sodafabrik AG
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 Badische Anilin and Sodafabrik AG filed Critical Badische Anilin and Sodafabrik AG
Priority to DE19712122822 priority Critical patent/DE2122822A1/en
Publication of DE2122822A1 publication Critical patent/DE2122822A1/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D307/00Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/02Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
    • C07D307/34Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D307/38Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms
    • C07D307/40Radicals substituted by oxygen atoms
    • C07D307/42Singly bound oxygen atoms

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

5-Benzyl-furan-3-hydroxymethyl chrysanthemate, useful as plant protective agent and contg. a proportion (e.g. 73%) of insecticidally active 3,5-isomer, is prepd by reacting a benzyloxazole of formula (I): (where one of R1 and R4 is H and the other is benzyl and R5 is Me or a carboxylate gp) with propargyl chrysanthemate at 150-250 (220 degrees C) opt. in vacuo, batchwise or continuously, opt in a solvent, esp. standard solvent for Diels-Alder reactions.

Description

Verfahren zur Herstellung von Chrysanthemumsaure-5-benzyl-furan-3-hydroxymethylester Die Erfindung betrifft ein Verfahren zur Herstellung von Chrysanthemumsaure-5-benzyl-furan-3-hydroxymethylester durch Umsetzung eines Benzyloxazols mit Chrysanthemumsäurepropargylester.Process for the preparation of chrysanthemum acid-5-benzyl-furan-3-hydroxymethyl ester The invention relates to a process for the preparation of chrysanthemum acid 5-benzyl-furan-3-hydroxymethyl ester by reacting a benzyloxazole with propargylic chrysanthemum acid.

Es ist bekannt, Chrysanthemumsaure-5-benzyl-furan-)-hydroxymethylester als Insektizid zu verwenden. Seine Herstellung nach bekannten Verfahren ist Je doch nicht voll befriedigend, da sie von schwer zugänglichen Ausgangsstoffen ausgeht bzw. nur auf umständlichem oder unwirtschaftlichem Wege durchgeführt werden kann.It is known that chrysanthemum acid 5-benzyl-furan -) - hydroxymethyl ester to use as an insecticide. Its production according to known processes is, however not fully satisfactory because it starts from raw materials that are difficult to access or can only be carried out in a cumbersome or uneconomical way.

Es wurde nun gefunden, daß man Chrysanthemumsäure-5-benzylfuran-)-hydroxymethylester vorteilhaft erhält, wenn man ein Benzyloxazol der allgemeinen Formel in der einer der beiden Reste R1 und R4 Wasserstoff und der andere den Benzylrest und R5 einen Methylrest oder eine Carbalkoxygruppe bezeichnet, mit dem Chrysanthemumsaurepropargylester bei einer Temperatur zwischen 150 und 2500C umsetzt.It has now been found that 5-benzylfuran -) - hydroxymethyl chrysanthemum acid is advantageously obtained if a benzyloxazole of the general formula is used in which one of the two radicals R1 and R4 denotes hydrogen and the other denotes the benzyl group and R5 denotes a methyl group or a carbalkoxy group with which propargylic chrysanthemum acid reacts at a temperature between 150 and 2500C.

Im Hinblick auf den Stand der Technik liefert das Verfahren nach der Erfindung den gewünschten Ester auf einfacherem und wirtschaftlicherem Wege in guter Ausbeute und Reinheit.With regard to the prior art, the method according to the Invention of the desired ester in a simpler and more economical way in good Yield and purity.

Als Ausgangsstoff ffir das Verfahren nach der Erfindung eignet s ich insbesondere das 2-Benzyl-5-methyl-oxazol Die AusgarlKsstoffe können in stöchiometrischem Verhnltnis oder mit eislem rjberschuß eines Ausgangsstoffes, bezogen auf den anderen Ausgangsstoff, z. B. in einem Molverhältnis von 1 zu 0,1 bis 10, insbesondere 1 zu 0,3 bis 3, umgesetzt werden.It is suitable as a starting material for the process according to the invention in particular the 2-benzyl-5-methyl-oxazole The AusgarlKsstoffe can in stoichiometric Ratio or with an absolute excess of a starting material, based on the others Starting material, e.g. B. in a molar ratio of 1 to 0.1 to 10, especially 1 to 0.3 to 3, are implemented.

Die Reaktion wird bei einer Temperatur zwischen 150 und 250°C, vorzugsweise bei 2200C, drucklos oder unter Druck, kontinuierlich oder diskontinuierlich durchgeführt. Gegebenenfalls verwendet man Lösungsmittel, insbesondere die üblicherweise bei Diels-Alder-Reaktionen verwendeten (siehe Bibliographie in Onishchenko, Diene Synthesis (Isreael Program for Scientific Translation, Jerusalem, 1964)), wie aromatische Kohlenwasserstoffe, z. B.The reaction is carried out at a temperature between 150 and 250 ° C, preferably carried out at 2200C, without pressure or under pressure, continuously or discontinuously. If appropriate, solvents are used, in particular those customarily used in Diels-Alder reactions used (see bibliography in Onishchenko, Diene Synthesis (Isreael Program for Scientific Translation, Jerusalem, 1964)), such as aromatic hydrocarbons, z. B.

Benzol, Toluol, Xylole, p-Cymol; Nitrile, z. B. Acetonitril; Chlorkohlenwasserstoffe, z. B. Chloroform, Methylenchlorid.Benzene, toluene, xylenes, p-cymene; Nitriles, e.g. B. acetonitrile; Chlorinated hydrocarbons, z. B. chloroform, methylene chloride.

Der Zusatz von Hydrochinon oder anderer Stabilisatoren und/oder von Katalysatoren, wie sie bei Diels-Alder-Reaktionen ilblich sind, zum Beispiel Triäthylamin, Trichloressigsäure, Trifluoressigsaure, vermag in Einzelfällen die Ausbeuten zu verbessern bzw die Reaktionszeiten zu verkürzen.The addition of hydroquinone or other stabilizers and / or of Catalysts, as they are common in Diels-Alder reactions, for example triethylamine, Trichloroacetic acid, trifluoroacetic acid, can increase the yields in individual cases improve or shorten the response times.

Die Reaktion kann wie folgt durchgeführt werden: Ein Gemisch der Ausgangsstoffe, gegebenenfalls zusammen mit Lösungsmittel, Stabilisator und/oder Katalysator, wird während 4 bis 24 Stunden bei der Reaktionstemperatur gehalten. Zweckmäßig läßt man die Ausgangsstoffe in einem Inertgas, z. B. unter Stickstoff, miteinander reagieren. Anschließend wird aus dem Reaktionsgemisch der Endstoff in üblicher Weise, z. B. durch fraktionierte Destillation, abgetrennt und gegebenenfalls durch Destillation oder Kristallisation gereinigt.The reaction can be carried out as follows: A mixture of the starting materials, optionally together with solvent, stabilizer and / or catalyst held at the reaction temperature for 4 to 24 hours. Appropriately one leaves the starting materials in an inert gas, e.g. B. under nitrogen, react with each other. Subsequently, the end product is from the reaction mixture in the usual way, for. B. by fractional distillation, separated and optionally by distillation or crystallization purified.

Die nach dem Verfahren der Erfindung erhältliche Verbindung ist ein Pflanzenschutzmittel.The compound obtainable by the process of the invention is a Pesticides.

Die im folgenden Beispiel angeführten Teile bedeuten Gewichtsteile.The parts listed in the following example are parts by weight.

Beispiel 20 Teile 2-Benzyl-5-methyloxazol werden im Gemisch mit 60 Teile Chrysanthemumsäurepropargylester 2 Stunden drucklos auf 2200C erhitzt. Die destillative Aufarbeilung des Reaktionsgemisches ergab folgende Fraktionen: Kp14 122 bis 1400C 54,) Teile Gemisch aus 43,3 Teilen Chrysanthemumsäurepropargylester 11,0 Teile Benzyl-methyloxazol. Example 20 parts of 2-benzyl-5-methyloxazole are mixed with 60 Parts of propargylic chrysanthemum acid are heated to 220 ° C. for 2 hours without pressure. the distillative distribution of the reaction mixture resulted in the following Fractions: Bp14 122 to 1400C 54,) parts of a mixture of 43.3 parts of propargylic chrysanthemum acid 11.0 parts of benzyl-methyloxazole.

Kp0,3 172 bis 1930C 14,7 Teile Chrysanthemumsäure-benzyl-furanhydroxymethylestergemisch, das aus 73,5 % wirksamen ),5-Isomeren neben 26,5 %-des insektizid unwirksamen 2,3-Isomeren bestand (Analyse gaschromatographisch durchgeführt).Kp0.3 172 to 1930C 14.7 parts of Chrysanthemum acid benzyl furan hydroxymethyl ester mixture, that of 73.5% active), 5-isomers in addition to 26.5% of the insecticidally inactive 2,3-isomer passed (analysis carried out by gas chromatography).

Ausbeute an isomerem Gemisch der Furanester, bezogen auf umgesetztes Oxazol: 84 %, bezogen auf umgesetztes Propargylchrysanthemat: 55 %. Umgesetztes Oxazol: 45 %.Yield of isomeric mixture of furan esters, based on converted Oxazole: 84%, based on converted propargyl chrysanthemate: 55%. Implemented Oxazole: 45%.

Claims (1)

Patentanspruch Claim Verfahren zur Herstellung von Chrysanthemumsäure-5-benzyl-furan-3-hydroxymethylester, dadurch gekennzeichnet, daß man ein Benzyloxazol der allgemeinen Formel in der einer der beiden Reste R1 und R4 Wasserstoff und der andere den Benzylrest und R5 einen Methylrest oder eine Carbalkoxygruppe bezeichnet, mit Chrysanthemumsäurepropargylester bei einer Temperatur zwischen 150 und 2500C umsetzt.Process for the preparation of chrysanthemum acid 5-benzyl-furan-3-hydroxymethyl ester, characterized in that a benzyloxazole of the general formula in which one of the two radicals R1 and R4 is hydrogen and the other is the benzyl radical and R5 is a methyl radical or a carbalkoxy group, and is reacted with propargylic chrysanthemum acid at a temperature between 150 and 2500C.
DE19712122822 1971-05-08 1971-05-08 Insecticidally active 5-benzyl-furan-3-hydroxymethyl - chrysanthemate - prepd from benzyloxazoles and propargyl chrysanthemo Pending DE2122822A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712122822 DE2122822A1 (en) 1971-05-08 1971-05-08 Insecticidally active 5-benzyl-furan-3-hydroxymethyl - chrysanthemate - prepd from benzyloxazoles and propargyl chrysanthemo

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712122822 DE2122822A1 (en) 1971-05-08 1971-05-08 Insecticidally active 5-benzyl-furan-3-hydroxymethyl - chrysanthemate - prepd from benzyloxazoles and propargyl chrysanthemo

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DE2122822A1 true DE2122822A1 (en) 1972-11-23

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