DE2952068A1 - Substd. lactone(s) intermediates for pharmaceuticals, etc. - prepd. by halogenation and cyclisation or acid cyclisation of pentane-carboxylic acid derivs. - Google Patents
Substd. lactone(s) intermediates for pharmaceuticals, etc. - prepd. by halogenation and cyclisation or acid cyclisation of pentane-carboxylic acid derivs.Info
- Publication number
- DE2952068A1 DE2952068A1 DE19792952068 DE2952068A DE2952068A1 DE 2952068 A1 DE2952068 A1 DE 2952068A1 DE 19792952068 DE19792952068 DE 19792952068 DE 2952068 A DE2952068 A DE 2952068A DE 2952068 A1 DE2952068 A1 DE 2952068A1
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- Prior art keywords
- lactones
- alkyl
- radical
- formula
- hydrogen
- 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.)
- Withdrawn
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/38—Compounds containing oxirane rings with hydrocarbon radicals, substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C53/00—Saturated compounds having only one carboxyl group bound to an acyclic carbon atom or hydrogen
- C07C53/15—Saturated compounds having only one carboxyl group bound to an acyclic carbon atom or hydrogen containing halogen
- C07C53/19—Acids containing three or more carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/38—Compounds containing oxirane rings with hydrocarbon radicals, substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
- C07D303/40—Compounds containing oxirane rings with hydrocarbon radicals, substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals by ester radicals
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/26—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
- C07D307/30—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D307/32—Oxygen atoms
- C07D307/33—Oxygen atoms in position 2, the oxygen atom being in its keto or unsubstituted enol form
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
- C07D309/16—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
- C07D309/28—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D309/30—Oxygen atoms, e.g. delta-lactones
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
- C07D309/32—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
DYNAMIT NOBEL AKTINGESELLSCHAFT DYNAMIT NOBEL AKTINGESELLSCHAFT
Troisdorf, Bez. Köln Substituierte Lactone und Verfahren zu deren Herstellung Gegenstand der vorliegenden Erfindung sind substituierte Lactone der Formel I in der A für (X=Cl, Br oder OH) oder -C = C-H H steht und R1, R2 und R3 gleiche oder verschiedene Reste aus der Gruppe Wasserstoff und C1-C10-Alkyl bedeuten, wobei mindestens einer der Reste R1, R2 oder R ein solche Alkylrest ist.Troisdorf, Bez. Cologne Substituted lactones and processes for their preparation The present invention relates to substituted lactones of the formula I in the A for (X = Cl, Br or OH) or -C = CH H and R1, R2 and R3 are identical or different radicals from the group consisting of hydrogen and C1-C10-alkyl, at least one of the radicals R1, R2 or R being such Is an alkyl radical.
Die Erfindung betrifft weiterhin Verfahren zur Herstellung von Verbindungen der Formel I in der R1, R² und R³ Wasserstoff und/oder gradketitge oder verzweitige Alkylreste mit 1 bis 10 C-Atomen bedeuten.The invention further relates to processes for the preparation of compounds of formula I in which R1, R² and R³ are hydrogen and / or gradketitge or branched Denote alkyl radicals with 1 to 10 carbon atoms.
Die erfindungsgemäßen Verfahrensweisen umfassen die Herstellung von Verbindungen der Formel 1, in der A für -Halogen, oder bedeuten. Bei diesen Herstellungsverfahren werden die neuen Verbindungen des Anspruchs 11 als Zwischenprodukte erhalten.The procedures of the invention include the preparation of compounds of formula 1 in which A is for -Halogen, or mean. In this production process, the new compounds of claim 11 are obtained as intermediates.
Bei der Herstellung der Verbindungen, in denen A fir Halogen steht, werden Patentencarbonsäureester der allgemeinen Formel in der R1, R², R³ die vorstehende Bedeutung haben und R4 für einen Alkyrest mit 1 bis 4 C-Atomen steht, zuerst mit Halogen zu einer Verbindung der allgemeinen Formel (Hal=Halogen) umgesetzt. Anschließend wird das erhaltene Additionsprodukt erhitzt, wobei Lactone der allgemeinen Formel entstehen.When making the compounds in which A fir Is halogen, are patent carboxylic acid esters of the general formula in which R1, R², R³ have the above meaning and R4 stands for an alkyl radical having 1 to 4 carbon atoms, first with halogen to form a compound of the general formula (Hal = halogen) implemented. The addition product obtained is then heated, whereby lactones of the general formula develop.
Die Halogenaddition an den Patentencarbonsäureester wird in an scih bekannter Weise in einem organischen Lösungsmittel vorzugsweise in einen flüssigen Chlorkohlenwasserstoff, wie z.B. CCl4, durch Zudosieren des halogens bei Temperaturen zwischen -10 bis +40°C vorgenommen. Das Lösungsmittel wird nach Beeindigung der Reaktion durch Destillation entfernt.The halogen addition to the patent carboxylic acid ester is in an scih in a known manner in an organic solvent, preferably in a liquid one Chlorinated hydrocarbons, such as CCl4, by adding the halogen at temperatures between -10 and + 40 ° C. The solvent is after finishing the Removed reaction by distillation.
Die Ringbildung zu den Lactonen der Formel II erfolgt bei Temperaturen zwischen 150 und 200°C. Es kann sowohl ohne als auch mit Lösungsmittel (z.B. Dekalin) gearbeitet werden. Während des Erhitzens entsteht ein Leichtsieder, der vorzugsweise sofort destillativ aus dem Reaktionsgemisch entfernt wird. Eine zweckmäßige Verfahrensweise besteht darin, das Halogenadditionsprodukt ohne Isolierung zu erhitzen.The ring formation to the lactones of the formula II takes place at temperatures between 150 and 200 ° C. It can be used both with and without solvents (e.g. decalin) to be worked. During the heating process, a low boiler arises, which is preferably is immediately removed from the reaction mixture by distillation. A good practice consists in heating the halogen addition product without isolation.
Für die Herstellung von Lactonen (er Formel 1, in denen werden Lactone der Formel I, in denen Zuerst mit basischen Mitteln zu Verbindungen der allgemeinen Formel III in der R1, R², R³ die vorstehende Bedeutung haben und R5 für einen Alkylrest mit 1 bis 4 C-Atomen, Wasserstoff oder ein Alkali- oder Erdalkalimetall steht, umgesetzt. Anschließend erfolgt die Lactonbiidung durch Behandeln mit Säuren.For the production of lactones (he formula 1, in which are lactones of the formula I, in which first with basic agents to compounds of the general formula III in which R1, R², R³ have the above meaning and R5 is an alkyl radical having 1 to 4 carbon atoms, hydrogen or an alkali or alkaline earth metal. The lactone is then formed by treatment with acids.
Die Behandlungmit den basischen Mitteln, die zur Ringverengung, d.h. Bildung des Epoxids führt, wird bei Temperatu- ren zwischen -10 und +50 OC vorgenommen. Als basische Mittel werden Alkali- oder Erdalkalialkoholatem -carbonate oder -hydroxide eingesetzt. Vorzugsweise werden Lösungsmittel wie Alkohole, Äther oder Wasser verwendet. Die Basen werden stöchiometrisch oder im t'berschuß eingesetzt.Treatment with the basic agents used for ring narrowing, i. Formation of the epoxy leads, is at temperatu- ren between -10 and +50 OC. Alkali or alkaline earth alcohols are used as basic agents carbonates or hydroxides are used. Solvents such as alcohols, Ether or water used. The bases are stoichiometric or in excess used.
Aus den dabei direkt erhaltenen Epoxiden werden die Lactone der Formel I mit durch Einrühren des Epoxids der Formel III in ein saures Medium, wie z.B.The lactones of the formula I are made from the epoxides obtained directly in this process by stirring the epoxide of the formula III into an acidic medium, such as
verdünnte wässrige Mineralsäuren oder verdünnte organische Säuren hergestellt. Die Säuren werden bevorzugt in einem Lösungsmittel eingesetzt. Dieses kann außer Wasser auch ein organisches Lösungsmittel, wie Alkohole, Äther, Eisessig, Tetrachlorkohlenstoff und dergleichen sein.dilute aqueous mineral acids or dilute organic acids manufactured. The acids are preferably used in a solvent. This In addition to water, an organic solvent such as alcohol, ether, glacial acetic acid, Be carbon tetrachloride and the like.
Die Säuren wirken bereits in katalytischen Mengen, können jedoch gegebenenfalls im größeren Überschuß eingesetzt werden. Die bevorzugten Mengen liegen zwischen 0,01 und 10 Mol-%.The acids already act in catalytic amounts, but can if necessary be used in larger excess. The preferred amounts are between 0.01 and 10 mol%.
Die Reaktionstemperatur kann in weiten Bereichen (-20 bis +200 °C) gewählt werden.The reaction temperature can be varied within a wide range (-20 to +200 ° C) to get voted.
Als Säuren eignen sich sowohl. Lewis- als auch Broensted -säuren, wie z.B. AlCl3, BF3, H2SO4, H3PO4, HNO3 und organische Carbonsauren.Both acids are suitable. Lewis and Broensted acids, such as AlCl3, BF3, H2SO4, H3PO4, HNO3 and organic carboxylic acids.
Eine zweckmäßige Verfahrensweise besteht darin, das xebildete Epoxid ohne Isolierung sofort mit der Säure zu behandeln.A convenient procedure is to use the epoxy that is formed to treat immediately with the acid without isolation.
Die Herstellung der Lactone der Formel I, bei denen A = -CH=CH- ist, erfolgt durch Thermolyse von Lactonen der Formel I, bei denen ist. Sie wird bevorzugt im Temperaturbereich zwischen +200 bis +500°C ausgeführt.The lactones of the formula I in which A = -CH = CH- are prepared by thermolysis of lactones of the formula I in which is. It is preferably carried out in the temperature range between +200 and + 500 ° C.
Zweckmäßigerweise tropft man die Ausgangsverbindung durch ein ewrhitzes, mit temperatubeständigem Material, z.B.The starting compound is expediently dripped through a heated, with temperature-resistant material, e.g.
keramischem Material, gefülltes Rohr. Die Thermolyse wird bevorzugt in einer Inertgasatmosphäre durchgeführt.ceramic material, filled tube. Thermolysis is preferred carried out in an inert gas atmosphere.
Dic Ausgangsverbindungen können dabei In Substanz oder in Lösungen eingesetzt werden. Als Lösungsmittel kommen temperaturstabile Verbindungen wie flüssige aromatische Kohlenwasserstoffe, z.B. Benzol, Toluol, Xylol, bevorzugt in Frage. Die Reaktion erfolgt unter Wasserabspaltung, wobei das Wasser bei Verwendung von mit Wasser nicht mischbaren Lösungsmitteln vor der destillativen Aufaroeitung abgeschieden werden kann.The starting compounds can be in substance or in solutions can be used. Temperature-stable compounds such as liquid compounds are used as solvents aromatic hydrocarbons, e.g. benzene, toluene, xylene, are preferred. The reaction takes place with elimination of water, the water being used when using Solvents immiscible with water are deposited before the distillative purification can be.
Die oben genannten Penten-4-carbonsäureester sind auf einfache Weise durch Umsetzung von entsprechend substituierten Allylalkoholen mit entsprechenden substituierten Orthoessigsäurealkylestern zugänglich (Tetrahedron Letters (1977), Seite 2543).The above-mentioned pentene-4-carboxylic acid esters are simple by reacting appropriately substituted allyl alcohols with the appropriate substituted alkyl orthoacetic acid esters accessible (Tetrahedron Letters (1977), Page 2543).
Die neuen Lactone a'cr allgemeinen Formel I stellen wertvelle organische Zwischenprodukte zur Herstellung von Pflanzenschutzmitteln, Pharmazeutica und Farbstoffen dar.The new lactones a'cr general formula I are valuable organic Intermediate products for the manufacture of pesticides, pharmaceuticals and dyes represent.
Beispiel 1 12,7 g 3,3-Diemthyl-penten-4-carbonsäuremethylester werden in 18,9 ml Tetrachlorkohlenstoff gelöst und zu dieser Mischung 14,3 g Brom in 44,9 ml Tetrachlorkohlenstoff bei 10 bis 20°C zugetropft. Nach Entfernen des Lösungmittels im Vakuum erhält man den 3,3-Dimethyl-4,5-dibrom-pentancarbonsäuremethylester in nachezu quantitativer Ausbeute.Example 1 12.7 g of 3,3-dimethyl-pentene-4-carboxylic acid methyl ester become dissolved in 18.9 ml of carbon tetrachloride and added to this mixture 14.3 g of bromine in 44.9 ml of carbon tetrachloride were added dropwise at 10 to 20 ° C. After removing the solvent the 3,3-dimethyl-4,5-dibromopentanecarboxylic acid methyl ester is obtained in vacuo according to quantitative yield.
NMR-spektrum (30 MHZ, CCl4): # = 1,1 (s, 3H); 1,3 (s, 3 H); 2,4 (s, 2 H); 2,7 (s, 3 H); 3,3-4,7 (m, 3 H) Beispiel 2 520,0 3,3-Dimethyl-4,5-dibrom-pentancarbonsäureme werden in einer Apparatur für eine fraktionierende Destillation bei einen Druck von 0,8 mm 30 min am Rückfluß gekocht und dann fraktioniert destilliert. Bei 95 bis 96°C geben 11,3 g Dihydro-4,4-dimethyl-5-brommethyl-(3H)-furanon über.NMR spectrum (30 MHz, CCl4): # = 1.1 (s, 3H); 1.3 (s, 3H); 2.4 (s, 2 H); 2.7 (s, 3H); 3.3-4.7 (m, 3H) Example 2 520.0 3,3-Dimethyl-4,5-dibromopentanecarboxylic acid mes are in an apparatus for a fractionating distillation refluxed at a pressure of 0.8 mm for 30 min and then fractionally distilled. At 95 to 96 ° C give 11.3 g of dihydro-4,4-dimethyl-5-bromomethyl- (3H) -furanone.
NMR-Spektum (100 MHz, CCl4); #=1,10 (s, 3H); 1,26 (s, 3H); 2,41 (m, 2H); 3,55 (m, 2H); 4,37 (m, 1H).NMR spectrum (100 MHz, CCl4); # = 1.10 (s, 3H); 1.26 (s, 3H); 2.41 (m, 2H); 3.55 (m, 2H); 4.37 (m, 1H).
Beispiel 3 43,7 g Dihydro-4,4-dimethyl-5-bromommethyl-(3H)-furanon werden in 166 ml Methanol gelöst und diese Mischung nach Zugabe von 11,6 g Natriummethylat 5 Std. am Rückfluß gekocht. Das Methanol wird im Vakuum entfernt und der Rückstand in Wasser aufgenommen. Die wässrige Lösung wird ausgeäthert und die organische Phase über Molekularsieh getrocknet und fraktiniert destilliert. Bei einem Druck von 13 mm geben bei 86 bis 88°C 29,5 4,5-Epoxy-3,3-dimethyl-pentancarbonsäurementylester über.Example 3 43.7 g of dihydro-4,4-dimethyl-5-bromomomethyl- (3H) -furanone are dissolved in 166 ml of methanol and this mixture after the addition of 11.6 g of sodium methylate Refluxed for 5 hours. The methanol is removed in vacuo and the residue taken up in water. The aqueous solution is extracted with ether and the organic phase dried over molecular sieves and fractionally distilled. At a pressure of 13 mm give at 86 to 88 ° C 29.5 4,5-epoxy-3,3-dimethylpentanecarboxylate above.
NMR-Spektrum (110 MHz, CCl4): #=0,95 (s, 3H); 0.98 (s, 3H); 2,22 (m, 2H); 2,52 (m, 2H); 2,77 (m, 1H); 3,60 (m, 3H).Nuclear Magnetic Resonance Spectrum (110 MHz, CC14): # = 0.95 (s, 3H); 0.98 (s. 3H); 2.22 (m, 2H); 2.52 (m, 2H); 2.77 (m. 1H); 3.60 (m, 3H).
Beispiel 4 21,1 g 4,5-Epoxi-3,3-dimethyl-pentancarbonsäurethylester werden in 50 ml CCl4 gelöst und diese Mischung mit 12 ml 2n H2SO4 5 Std. geschüttelt. Danach wird die organische Phase abgetrennt, die wässrige Phase mit Äther extrahiert und die vereinigten organischen Phasen über Molekularsieb getrocknet. Nach Entfernon des organische gemittels bleibt ein kristalliner Rückstand (17,6 g), der als Dihydro-4,4-dimethyl-5-hydroxymethyl-(3 H)-furanon (Fp. 40-42°C) identifiziert wird.Example 4 21.1 g of ethyl 4,5-epoxy-3,3-dimethyl-pentanecarboxylate are dissolved in 50 ml of CCl4 and this mixture is shaken with 12 ml of 2N H2SO4 for 5 hours. The organic phase is then separated off and the aqueous phase is extracted with ether and the combined organic phases are dried over molecular sieves. After Removal of the organic agent remains a crystalline residue (17.6 g), which as dihydro-4,4-dimethyl-5-hydroxymethyl- (3 H) -furanone (m.p. 40-42 ° C) is identified.
NMR-Spektrum (100 MHz, CDCl3): #=1,08 (s, 3H); 1,17 (s, 3H); 2,37 (s, 3H); 3,77 (m, 2H); 4,15 (m 1H); 3,80 (bs, 1H).Nuclear Magnetic Resonance Spectrum (100 MHz, CDCl3): # = 1.08 (s, 3H); 1.17 (s. 3H); 2.37 (s, 3H); 3.77 (m. 2H); 4.15 (m, 1H); 3.80 (brs, 1H).
Beispiel 4 2 g Dihydro-4,4-dimethyl-5-hydroxy-methyl-(3H)-furanon werden in 20 ml Toluol gelöst und diese Mischung unter Stickstoff durch ein beheizaren Quarztoht (Lärge 30 cm, Durchmesser 2,2 cm) welches mit Quarzkulgeln gefüllt ist, bei einer Temperatur von 300 °C innerhalb 80 min durchgetropft und in einer gekühlter Vorlage aufgefangen. Das Toluol wird bei Normaldruck durch fraktionierende Destillation entferat. Der Rückstand wird bei 12 mm destilliert. Es werden 0,5 g 3,4-Dihydro-4,4-dimethyl-α-pyron erhalten (Sdp. 12mm: 60-62°C). Darüber hinaus werden 1,3 g Ausgangsprodukt zurückgewonnen.Example 4 2 g of dihydro-4,4-dimethyl-5-hydroxy-methyl- (3H) -furanone are dissolved in 20 ml of toluene and this mixture is heated under nitrogen Quartz clay (length 30 cm, diameter 2.2 cm) which is filled with quartz balls, dripped through at a temperature of 300 ° C within 80 min and in a cooled Template caught. The toluene is at normal pressure by fractional distillation distant. The residue is distilled at 12 mm. There are 0.5 g of 3,4-dihydro-4,4-dimethyl-α-pyrone obtained (bp 12mm: 60-62 ° C). In addition, 1.3 g of starting product are recovered.
NMR-Spektrum (100 MHz, CCl4) #ppm: 1,12 (s, 6H); 2,40 (bc, 2H); 5,11 (d, 1H); 6,37 (d, 1H).Nuclear Magnetic Resonance Spectrum (100 MHz, CCl4) #ppm: 1.12 (s, 6H); 2.40 (bc, 2H); 5.11 (d, 1H); 6.37 (d. 1H).
Claims (11)
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792952068 DE2952068A1 (en) | 1979-12-22 | 1979-12-22 | Substd. lactone(s) intermediates for pharmaceuticals, etc. - prepd. by halogenation and cyclisation or acid cyclisation of pentane-carboxylic acid derivs. |
EP80107955A EP0031932B1 (en) | 1979-12-22 | 1980-12-17 | Substituted lactones, pentanoic acid derivatives and process for their preparation |
DE8080107955T DE3071987D1 (en) | 1979-12-22 | 1980-12-17 | Substituted lactones, pentanoic acid derivatives and process for their preparation |
US06/218,593 US4348535A (en) | 1979-12-22 | 1980-12-19 | Substituted lactones and processes for their preparation |
JP18061680A JPS56150078A (en) | 1979-12-22 | 1980-12-22 | Substituted lactone, its manufacture and pentanecarboxylic acid derivative |
CA000367357A CA1205814A (en) | 1979-12-22 | 1980-12-22 | Substituted lactones and processes for their preparation |
US06/282,689 US4424369A (en) | 1979-12-22 | 1981-07-13 | Substituted pyran-2-ones |
US06/375,060 US4508914A (en) | 1979-12-22 | 1982-05-05 | 3H-Furanones |
US06/540,731 US4562270A (en) | 1979-12-22 | 1983-10-11 | Process for preparing unsaturated six-membered lactones |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792952068 DE2952068A1 (en) | 1979-12-22 | 1979-12-22 | Substd. lactone(s) intermediates for pharmaceuticals, etc. - prepd. by halogenation and cyclisation or acid cyclisation of pentane-carboxylic acid derivs. |
Publications (1)
Publication Number | Publication Date |
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DE2952068A1 true DE2952068A1 (en) | 1981-07-02 |
Family
ID=6089467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE19792952068 Withdrawn DE2952068A1 (en) | 1979-12-22 | 1979-12-22 | Substd. lactone(s) intermediates for pharmaceuticals, etc. - prepd. by halogenation and cyclisation or acid cyclisation of pentane-carboxylic acid derivs. |
Country Status (1)
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DE (1) | DE2952068A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0131779A1 (en) * | 1983-07-15 | 1985-01-23 | Hüls Troisdorf Aktiengesellschaft | Method for the preparation of 3,4-dihydro-alpha pyrones |
DE3342598A1 (en) * | 1983-11-25 | 1985-06-05 | Dynamit Nobel Ag, 5210 Troisdorf | METHOD FOR PRODUCING 3,4-DIHYDRO (ALPHA) PYRON |
DE3713750A1 (en) * | 1987-04-24 | 1988-11-03 | Huels Troisdorf | Process for the preparation of 3,4-dihydro-4,4-dialkyl- alpha -pyrones, and carboxylates of dihydro-5-hydroxymethyl-2(3H)-furanones |
-
1979
- 1979-12-22 DE DE19792952068 patent/DE2952068A1/en not_active Withdrawn
Non-Patent Citations (4)
Title |
---|
Bull. Soc. Chim. France (1967), S. 2466-2472 * |
C. R. Acad. Sc. Paris, t. 284 (1977), Serie C, S. 343-346 * |
Chem. Abstr. 80(1974), Ref. 82 015 * |
J. Org. Chem. 41 (1976), S. 885-887 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0131779A1 (en) * | 1983-07-15 | 1985-01-23 | Hüls Troisdorf Aktiengesellschaft | Method for the preparation of 3,4-dihydro-alpha pyrones |
DE3342598A1 (en) * | 1983-11-25 | 1985-06-05 | Dynamit Nobel Ag, 5210 Troisdorf | METHOD FOR PRODUCING 3,4-DIHYDRO (ALPHA) PYRON |
US4673751A (en) * | 1983-11-25 | 1987-06-16 | Dynamit Nobel Ag | Method of preparing 3,4-dihydro-alpha-pyrones |
DE3713750A1 (en) * | 1987-04-24 | 1988-11-03 | Huels Troisdorf | Process for the preparation of 3,4-dihydro-4,4-dialkyl- alpha -pyrones, and carboxylates of dihydro-5-hydroxymethyl-2(3H)-furanones |
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