- PHEROMONES OF INSECTS AND THEIR ANALOGS. XXI. SYNTHESIS OF ALK-8Z-EN-1-OLS AND THEIR ACETATES FROM A FUNCTIONALLY DIFFERENTIATED PRODUCT OF OZONOLYSIS OF CYCLOOCTENE
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Dodec-8Z-en-1-ol (VIII) and tetradec-8Z-en-1-ol (IX) and the corresponding acetates (X and IX) - components of the sex pheromones of many species of Lepidoptera - have been synthesized from cyclooctene (I) in three stages.The ozonolysis of (I) ( -70 deg C, CH2Cl2-MeOH), NaHCO3; -20 deg C, Ac2O/Et3N) led to methyl 8-oxooctanoate (II).The DNPH of (II), (III), mp 59-61 deg C.The coupling of (II) with n-C3H17CH=PPh3 (IV) or with n-C5H11CH=PPh3 (V) (-70 deg C , 2h; 25 deg C, 15h, Ar) gave the methyl esters of dodec-8Z-enoic (VI) and tetradec-8Z-enoic (VII) acids, respectively.The reduction of (VI) and (VII) gave the corresponding alcohols (VIII) and (IX) by the acetylation (Ac2O-Py, 25 deg C, 24h) of which, (X) and (XI) , were obtained.The yields (percent): (II) 80, (VI) 45, (VII) 60, (VIII) 95, (IX) 90, (X) 75, (XI) 74.The IR and PMR spectra of compounds (II) and (VI-XI) are given.
- Odinokov, V. N.,Akhmetova, V. R.,Khasanov, Kh. D.,Abduvakhabov, A. A.,Tolstikov, G. A.,Panasenko, A. A.
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- SYNTHESIS OF PHEROMONE DERIVATIVES VIA Z-SELECTIVE OLEFIN METATHESIS
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Disclosed herein are methods for synthesizing fatty olefin metathesis products of high Z-isomeric purity from olefin feedstocks of low Z-isomeric purity. The methods include contacting a contacting an olefin metathesis reaction partner, such as acylated alkenol or an alkenal acetal, with an internal olefin in the presence of a Z-selective metathesis catalyst to form the fatty olefin metathesis product. In various embodiments, the fatty olefin metathesis products are insect pheromones. Pheromone compositions and methods of using them are also described.
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Paragraph 0261; 0267
(2021/12/28)
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- SYNTHESIS OF STRAIGHT-CHAIN LEPIDOPTERAN PHEROMONES THROUGH ONE- OR TWO- CARBON HOMOLOGATION OF FATTY ALKENES
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Methods for the preparation of alkenes including insect pheromones are described. The methods include homologation reactions employing reagents such as 1,3-diesters, epoxides, cyanoacetates, and cyanide salts for elongation of starting materials and intermediates by one or two carbon atoms. The alkenes include insect pheromones useful in a number of agricultural applications.
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- Synthesis method of (Z/E)-8-dodecen-1-alcohol acetate compound
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The invention provides a synthesis method of a (Z/E)-8-dodecane-1-alcohol acetate compound. Specifically, the method includes the following steps: preparing 8-bromooctanol from 1,8-octanediol, then performing esterification reaction to obtain 8-Bromooctanol acetate, and then preparing omega-acetoxyoctanyl triphenyl phosphine bromide salt, and finally performing reaction through Scholoer-wittig toobtain (Z/E)-8-dodecene-1-alcohol acetate. The synthesis method has the advantages of high availability of raw materials, high yield and good selectivity, and is suitable for industrial production.
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Paragraph 0060; 0067; 0068; 0070; 0076; 0077
(2019/05/21)
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- SYNTHESIS OF PHEROMONES AND RELATED MATERIALS VIA OLEFIN METATHESIS
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Methods for preparation of olefins, including 8- and 11-unsaturated monoenes and polyenes, via transition metathesis-based synthetic routes are described. Metathesis reactions in the methods are catalyzed by transition metal catalysts including tungsten-, molybdenum-, and ruthenium-based catalysts. The olefins include insect pheromones useful in a number of agricultural applications.
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- A (Z/E) - 8 - dodecene -1 - ethoxylate ester synthesis method
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The invention discloses a (Z/E)-8-dodecylene-1-olacetate synthesis method. The method is characterized in that 1-halogenated pentine and magnesium 1-(2-oxotetrahydropyranyl)heptylhalide as initial raw materials undergo a coupling reaction to produce 8-(2-oxotetrahydropyranyl)dodecyne, the 8-(2-oxotetrahydropyranyl)dodecyne is subjected to hydrogenation, one-pot deprotection and esterification so that (Z)-8-dodecylene-1-olacetate and (E)-8-dodecylene-1-olacetate are obtained, wherein a mole ratio of (Z)-8-dodecylene-1-olacetate to (E)-8-dodecylene-1-olacetate is (90%-99.5%): (10%-0.5%). The method utilizes 1-halogenated pentine and magnesium 1-(2-oxotetrahydropyranyl)heptylhalide as initial raw materials, provides a novel reaction route, has a short route, produces less by-product, has simple and routine processes, is free of complex post-reaction treatment processes and improves production efficiency. The method satisfies different insect pheromone trap or lure requirements on an isomer ratio in practical application and is suitable for large-scale industrial production.
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- A pheromone food heart insectthe pear is small (Z/E)-8-dodecene acetum acid ester synthetic method
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The invention provides a synthesis method of grapholitha molesta sex pheromone (Z/E)-8-dodecene acetate. The synthesis method comprises the following steps: (1) by taking methylbenzene or benzene as a solvent and 1,8-octanediol and hydrobromic acid as starting raw materials, performing unilateral bromination reaction to obtain 8-bromooctanol; (2) by taking ethanol as a solvent, adding 8-bromooctanol and triphenylphosphine into a reaction kettle, after the reaction, cooling and separating out 8-hydroxyl octyl triphenylphosphine crystals by taking methylbenzene as an eluent; (3) performing Witting reaction on the 8-hydroxyl octyl triphenylphosphine and n-butyraldehyde under the presence of a catalyst 18-crown ether-6 to obtain (Z/E)-8-dodeceneanol, wherein potassium carbonate is adopted as alkali; and (4) by taking pyridine as a solvent, reacting the (Z/E)-8-dodeceneanol with acetic anhydride or acetyl chloride to obtain (Z/E)-8-dodecene acetate. The method mild in conditions, fewer in steps, high in yield, and suitable for industrial production, and raw materials are easily available.
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- PALLADIUM-CATALYZED DECARBONYLATION OF FATTY ACID ANHYDRIDES FOR THE PRODUCTION OF LINEAR ALPHA OLEFINS
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The present invention is directed to methods of forming olefins, especially linear alpha olefins from fatty acids or anhydrides, each method comprising: contacting an amount of precursor carboxylic acid anhydride with a palladium catalyst comprising a bidentate bis-phosphine ligand in a reaction mixture so as to form an olefin in a product with the concomittant formation and removal of CO and water from the reaction mixture, either directly or indirectly, wherein the reaction mixture is maintained with a sub-stoichiometric excess of a sacrificial carboxylic acid anhydride, an organic acid, or both, said sub-stoichiometric excess being relative to the amount of the precursor carboxylic acid anhydride. The precursor carboxylic acid anhydride may be added to the reaction mixture directly or formed in situ by the reaction between at least one precursor carboxylic acid with a stoichiometric amount of the sacrificial acid anhydride.
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Page/Page column
(2014/06/23)
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- Palladium-catalyzed decarbonylative dehydration of fatty acids for the production of linear alpha olefins
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A highly efficient palladium-catalyzed decarbonylative dehydration reaction of carboxylic acids is reported. This method transforms abundant and renewable even-numbered natural fatty acids into valuable and expensive odd-numbered alpha olefins. Additionally, the chemistry displays a high functional group tolerance. The process employs a low loading of palladium catalyst and proceeds under solvent-free and relatively mild conditions.
- Liu, Yiyang,Kim, Kelly E.,Herbert, Myles B.,Fedorov, Alexey,Grubbs, Robert H.,Stoltz, Brian M.
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p. 130 - 136
(2014/03/21)
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- SYNTHESIS OF Z-OLEFIN-CONTAINING LEPIDOPTERAN INSECT PHEROMONES
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The present invention is directed to methods of synthesizing insect pheromones, particularly lepidopteran insect pheromones, their precursors and derivatives from inexpensive, readily available starting materials using olefin metathesis catalysis.
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Paragraph 0195; 0196
(2013/09/12)
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- Concise syntheses of insect pheromones using Z-Selective cross metathesis
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Very short synthetic routes to nine cisolefin-containing pheromones containing a variety of functionality, including an unconjugated (E,Z) diene, are reported (see scheme). These lepidopteran pheromones are used extensively for pest control, and were easily prepared using ruthenium-based Z-selective cross metathesis, highlighting the advantages of this method over less efficient ways to form Z olefins.
- Herbert, Myles B.,Marx, Vanessa M.,Pederson, Richard L.,Grubbs, Robert H.
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supporting information
p. 310 - 314
(2013/02/23)
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- Copper-catalyzed cross-coupling of (Z)-allyl phenyl ethers with Grignard compounds in the synthesis of insect pheromones
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(8Z)-Dodec-8-en-1-yl acetate (pheromone of oriental fruit moth Grapholita molesta) and (9Z)-dodec-9-en-1-yl acetate (pheromone of grape berry moth Paralobesia viteana) containing impurities of isomeric structures were synthesized via copper-catalyzed cross-coupling of (Z)-1-phenoxyhex-2-ene and (Z)-1-phenoxypent-2-ene, respectively, with Grignard compounds in the key stage.
- Petrushkina,Kalinin
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experimental part
p. 1897 - 1899
(2009/02/08)
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- Novel convenient synthesis of (Z/E)-8-dodecenyl acetates, components of the Grapholitha molesta sex pheromone
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Components of the Grapholitha molesta sex pheromone, (Z/E)-8-dodecenyl acetates (1, 2), were synthesized in five steps in 20% overall yield using 10-hydroxydecanoic acid (3) as starting material.
- Huang,Li,Lu,Aisa
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p. 727 - 729
(2008/02/08)
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- Process for preparing functional group-containing olefinic compounds
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A process for preparing functional group-containing olefinic compounds comprises the steps of (a) reacting at least one alkylidene phosphorane with at least one carbonyl-containing compound that comprises at least one group that is a leaving group, or that is capable of subsequent conversion to a leaving group, to form an olefinic compound that comprises at least one leaving group, the carbonyl-containing compound being selected from the group consisting of ketones and aldehydes; and (b) reacting the olefinic compound with at least one functional group-containing nucleophile to form a functional group-containing olefinic compound.
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Page column 10-11
(2010/02/10)
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- Use of enyne compounds in the synthesis of insect pheromones
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A new approach has been developed to the synthesis of monogenic insect pheromones with acetogenin and macrolide structures, using the low reactivity of ozone and of 9-borabicyclo[3.3.1]nonane towards an acetylenic function as compared with a vinyl function.
- Ishmuratov,Ishmuratova,Odinokov,Tolstikov
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- Z-Selective Synthesis of Homoallylic Alcohols via 2-Alkenylation of Aldehydes by 1-(Tributylstannyl)-2-alkene
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1-(Tributylstannyl)-2-alkene reacts with a solution of an aldehyde and BuSnCl3 to give (Z)-homoallylic alcohol.Z-Selective 2-methyl-2-butenylation can be accomplished by using (Z)-2-methyl-1-(tributylstannyl)-2-butene instead of 1-(tributylstannyl)-2-alkene.This reaction is useful as a new method to make (Z)-double bond.An application ot the present method for a synthesis of pheromones is also described.
- Miyake, Hideyoshi,Yamamura, Kimiaki
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p. 897 - 900
(2007/10/02)
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- OZONOLYSIS OF ALKENES AND REACTIONS OF POLYFUNCTIONAL COMPOUNDS. XXXV. SYNTHESIS OF 8Z-DODECENYL- AND 11Z-TETRADECENYL ACETATES FROM THE CYCLIC DIMER OF BUTADIENE
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The stereoselective synthesis of 8Z-dodecenyl- and 11Z-tetradecenyl acetates which are components of the sex pheromones of many species of insect of the order Lepidoptera, was realized on the basis of the partial ozonolysis of (Z,Z)-1,5-cyclooctadiene and its isomerization product (Z,Z)-1,3-cyclooctadiene.
- Odinokov, V. N.,Ishmuratov, G. Yu.,Galeeva, R. I.,Kharisov, R. Ya.,Sokol'skaya, O. V.,at al.
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p. 646 - 651
(2007/10/02)
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- SYNTHESES A L'AIDE DE SULFONES (XXXVII). SYNTHESE DE TROIS PHEROMONES A UNE DOUBLE LIAISON Z : Z, 8-DDA; Z, 9-DDA; Z, 9-TDA.
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The title compounds Z,8-dodecen-1yl acetate, Z,9-dodecen-1yl acetate and Z,9-tetradecen-1yl-acetate have been synthesized in three efficient steps: the reaction mixture from metalated ω-hydroxy sulfones and appropriate aldehydes was quenched with acetic anhydride yielding a diastereoisomeric mixture of β-acetoxy sulfones.Convergent elimination with powdered sodium hydroxide led to the E vinylic sulfone.Stereospecific hydrogenolysis of the sulfonyl group was carried out with sodium dithionite leading to the unsaturated alcohol (> 99percent Z).
- Julia, Marc,Stacino, Jean-Pierre
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p. 2469 - 2474
(2007/10/02)
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- SILICON IN ORGANIC SYNTHESIS. STREREOSELECTIVE SYNTHESIS OF SOME INSECT SEX PHEROMONES
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Trialkylsilallyl anion is alkylated by alkyl halides to give regio- and strereo-selectively the γ-product with trans-strereochemistry at double bond.The trans-vinylsilanes are transformed strereoselectively to Z-vinyl iodides.Coupling of the vinyl idiodes with organometallic reagents gives Z-alkenes.This approach has been applied to the synthesis of several insect sex pheromones.
- Chan, T. H.,Koumaglo, K.
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p. 109 - 120
(2007/10/02)
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- INSECT PHEROMONES AND THEIR ANALOGS. XIII. SYNTHESIS OF DODEC-8E-ENYL AND DODEC-8Z-ENYL ACETATES - COMPONENTS OF THE SEX PHEROMONES OF Grapholitha funebrana AND Grapholitha molesta
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A new route is proposed for the synthesis of dodec-8E-enyl and dodec-8Z-enyl acetates which is based on the reaction of the Grignard reagent from the readily accessible 1-bromo-5-(1-ethoxyethoxy)pentane with 1-bromohept-3-yne - the bromide obtained from product of the β-hydroxyethylation of pent-1-yne with 2-chloroethylvinyl ether, hept-3-yn-1-ol, by a double decomposition reaction of its tosylate with lithium bromide.The key synthon - dodec-8-yn-1-ol - was converted with the aid of sodium in liquid ammonia into the stereochemical individual dodec-8E-enol, while its reduction with the aid of 9-borabicyclononane (BBN) gave the stereoisomeric alcohol exclusively with the Z configuration, as followed from the results of capillary GLC and the IR spectra of the corresponding acetates.The PMR spectra of the compounds synthesized are also given.
- Odinokov, V. N.,Ishmuratov, G. Yu.,Balezina, G. G.,Tolstikov, G. A.
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p. 372 - 374
(2007/10/02)
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- The Synthesis of (Z)-8-Dodecen-1-ol and its Acetate, Pheromone Components of the Oriental Fruit Moth (Grapholita molesta)
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The two main sex pheromone components of the Oriental fruit moth (Grapholita molesta), viz. (Z)-8-dodecen-1-ol and its acetate, have been synthesized from (Z,E,E)-1,5,9-cyclododecatriene in approximately 15 percent overall yield.
- Aukrust, Audun,Rongved, Pal,Skatteboel, Lars
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p. 267 - 272
(2007/10/02)
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- Metamorphosis of Castor Oil to Insect Sex-pheromones and Useful Synthons
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The primary fragmentation products of Castor oil (1), namely, methyl undec-10-enoate (2) and sebacic acid (3) have been converted, using novel reactions and strategies into synthons of the type H-CC-(CH2)n-3-CH2OTHP (n=6=4; n=7=14; n=8=22; n=9=29).A surprisingly clean decarboxylative elimination of sebacic acid monoester gives methyl non-8-enoate (7), a synthon related to recefeiolide and a precursor to 4, the utility of which, has been illustrated with the synthesis of insect-pheromones of the species Grapholita molesta.Methyl dec-9-enoate (15) has been prepared by a novel and practical terminal ? to lower terminal ? degradation of 2.Compound 7 has been transformed via synthon 14 to the insect sex-pheromones of the species, Spodoptera frugiperda, Heliothis virescens and Paralobesia viteana in high yields and excellent stereochemical purity. 1-Tetrahydropyranyloxyundec-10-yne (22) readily prepared from 2, has been used to illustrate a new strategy in pheromone synthesis, namely, the use of coupling elements, leading to the preparation of bombykol in high yields and excellent stereochemical purity. 1-Tetrahydropyranyloxydodec-11-yne (29), already reported, has been transformed to vaccenic acid (30), the transposed ?-isomer of oleic acid, in good yields, thus demonstrating the use of acetylide synthons for the preparation of rare fatty acids also.
- Ranganathan, S.,Maniktala, Vibha,Kumar, Raaj,Singh, G. P.
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p. 1197 - 1207
(2007/10/02)
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