- 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 0189; 0190
(2013/09/12)
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- Stereoselective synthesis of 11(E)-tetradecen-1-yl acetate-Sex pheromone of sod webworm (Loxostege sticticalis)
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On the basic of Claisen rearrangement using orthoesters we carried out stereoselective synthesis of 11(E)-tetradecen-1-yl acetate, a sex pheromone of sod webworm (Loxostege sticticalis), which is a specially dangerous pests of crops.
- Shakhmaev,Ishbaeva,Shayakhmetova
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experimental part
p. 1171 - 1174
(2011/05/04)
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- Stereospecific synthesis of 11E-tetradecenal, 11E-tetradecen-1-ol, and its acetate, pheromone components of insects of Lepidoptera order, from 10-undecenoic acid
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A regio-and stereospecific synthesis of 11E-tetradecen-1-ol and its derivatives, which are pheromone components of many insect species of Lepidoptera order, by means of a reaction of methylmagnesium cuprate reagent with 1,12-tridecadien-3-yl acetate by the SN2' mechanism, was carried out.
- Ishmuratov,Yakovleva,Kharisov,Muslukhov,Tolstikov
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p. 1035 - 1037
(2007/10/03)
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- Pheromones of insects and their analogs. LII. Sythesis of dodec-9-en-1-yl and tetradec-11-en-1-yl acetates from the products of the partial ozonolysis of cycloocta-1z,5z-diene and cyclodeca-1e,5z-diene
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A new approach to the synthesis of octane-1,8-and decane-1,10-diols based on the partial ozonolysis of cyclic oligomers has been developed.
- Odinokov,Botsman,Gladysheva
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p. 381 - 383
(2007/10/03)
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- INSECT PHEROMONES AND THEIR ANALOGUES. XXXVII. SYNTHESIS OF TETRADEC-11E-ENAL AND OF TETRADEC-11E-EN-1-OL AND ITS ACETATE FROM UNDECENOIC ACID
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A stereospecific synthesis has been achieved of tetradec-11E-enal and of tetradec-11E-en-1-ol and its acetate - components of the pheromones of many species of insects of the order Lepidoptera - from the readily available undecenoic acid, using the Knoevenagel reaction and catalytic hydroalumination.
- Odinokov, V. N.,Ishmuratov, G. Yu.,Vakhidov, R. R.,Berg, A. A.,Muslukhov, R. R.,Tolstikov, G. A.
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p. 237 - 240
(2007/10/02)
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- Kolbe electrosynthesis of (E)-11-tetradecenal-The sex pheromone of eastern spruce budworm (Choristoneura of fumiferana)
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The synthesis of (E)-11-tetradecenal (7), a potent lepidoptera sex pheromone is reported employing the modified Knoevenagel condensation and Kolbe electrolysis in the key steps.
- Singh, Krishna Nand,Singh, Manorama,Misra, Ram Achal
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p. 867 - 868
(2007/10/02)
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- Acetylcyclopropane as a Five-Carbon Building Block in the Synthesis of some Acetogenin Insect Pheromones
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Interaction of deprotonated acetylcyclopropane cyclohexylimine with several aliphatic alkyl halides, epoxides, and aldehydes efficiently gave the corresponding cyclopropyl ketones.Some of the respectible alcohols were rearranged in a highly stereoselective manner under the action of trimethylsilyl bromide in the presence of zinc bromide into the corresponding linear (E)-homoallyl bromides.The latter were used, in turn, as key intermediates in concise syntheses of thirteen terminally functionalized straight-chain oligoolefins which are known to constitute acetogenin pheromonal components for more than 65 species of lepidopteran insects.
- Moiseenkov, Alexander M.,Czeskis, Boris A.,Ivanova, Natalya M.,Nefedov, Oleg M.
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p. 2639 - 2649
(2007/10/02)
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- SIMPLE SYNTHESIS OF ACETOGENIN TRANSOID INSECT PHEROMONES STARTING FROM ACETYLCYCLOPROPANE
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A highly effective synthesis of a series of alkyl and 1-alkenyl cyclopropyl ketones, which are key components in the complete synthesis of a large number of transoid lepidoptera pheromones, has been developed, based on the alkylation of N-cyclohexyl-1-cyclopropylethylideneimine or its condensation with aldehydes.
- Cheskis, B. A.,Ivanova, N. M.,Moiseenkov, A. M.,Nefedov, O. M.
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p. 1372 - 1380
(2007/10/02)
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- SYNTHESIS OF PHEROMONES, IV. CHEMISTRY OF THE WITTIG REACTION, I. EFFECTS OF REACTION CONDITIONS ON THE STEREOSELECTIVITY AND YIELD OF THE WITTIG REACTION
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The reactions of nonstabilized triphenylphosphorus ylides with aldehydes have been studied in detail.The stereochemistry and yields of the alkene products are highly dependent upon base used for the generation of the ylide, the solvent and reaction temperature.The synthesis of sex pheromone components by Wittig reaction are also described.
- Vinczer, Peter,Juvancz, Zoltan,Novak, Lajos,Szantay, Csaba
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p. 797 - 820
(2007/10/02)
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- Pheromones via Organoboranes. 2. Vinylic Organoboranes. 8. Applications of the General Stereoselective Synthesis of (E)-Disubstituted Alkenes via Thexylchloroborane-Dimethyl Sulfide to the Synthesis of Pheromones Containing an (E)-Alkene Moiety
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Various (E)-pheromones of the general structure (E)-X-alken-1-yl acetates, (E)-X-alken-1-ols, and (E)-X-alken-1-als have been prepared via thexylchloroborane-dimethyl sulfide (ThxBHCl*SMe2).Hydroboration of acetate-functionalized alkenes with ThxBHCl*SMe2 gives cleanly the corresponding thexylalkylchloroboranes (ThxBRCl, B).Hydridation of B with potassium triisopropoxyhydride (KIPBH) at -78 deg C gives cleanly the corresponding thexylalkylboranes (ThxBRH, C).These are quenched immediately with 1-halo-1-alkynes to give B-(cis-1-halo-1-alkenyl)thexylalkylboranes (D).Treatment of D with sodium methoxide results in the displacement of bromine by the alkyl group on boron to produce B-(trans-1-alkyl-1-alkenyl)thexylborinates (E).Protonolysis of E with acetic acid provides (E)-X-alken-1-yl acetates in high yields and in >99percent isomeric purities.Treatment of (E)-X-alken-1-yl acetates with base affords the corresponding (E)-X-alken-1-ols.Oxidation of (E)-X-alken-1-ols with dimethyl sulfoxide activated by oxalyl chloride or the complex of dimethyl sulfide and chlorine produces (E)-X-alken-1-als quantitatively.By properly choosing the starting functionalized alkenes and 1-halo-1-alkynes, various (E)-pheromones can be prepared easily.The present procedure appears to be general.There does not appear to be any limitation on the length of the carbon chain or the position of the double bond in the target molecules.
- Brown, Herbert C.,Lee, Hsiupu D.,Kulkarni, Surendra U.
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p. 5282 - 5286
(2007/10/02)
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- SYNTHESIS OF (Z)-TETRADEC-11-EN-1-OL AND (Z)-HEXADEC-11-EN-1-OL FROM DODECANE-1,12-DIOL
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A method have been developed for obtaining (Z)-tetradec-11-en-1-ol and (Z)-hexadec-11-en-1-ol via dodec-11-yn-1-ol.
- Zakharkin, L. I.,Guseva, V. V.
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p. 733 - 736
(2007/10/02)
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- STEREOSPECIFIC SYNTHESIS OF PHEROMONES OF THE E-ALKENE SERIES FROM THE TELOMER OF BUTADIENE WITH PHENOL
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The stereospecific synthesis of 7E- and 9E-dodecenyl acetates, 7E- and 11E-tetradecenyl acetates, 11E-tetradecen-1-ol, and 11E-hexadecenyl acetate, i.e., E-olefinic sex pheromones, was realized from 1-phenoxy-2E,7-octadiene (the telomer of butadiene with phenol).
- Zakharkin, L. I.,Petrushkina, E. A.
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p. 1419 - 1422
(2007/10/02)
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- Synthesis of (E)-11-Tetradecen-1-ol
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Protection of alcoholic function of the alcohol (II) as its tetrahydropyranyl ether gives III which on hydroboration-oxidation reaction affords 11-tetrahydropyranyloxyundecanol (IV).Oxidation of IV with pyridinium chlorochromate in anhyd. methylene chloride yields the corresponding aldehyde (V) which when subjected to modified Wittig reaction with ethyl diethylphosphonoacetate furnishes ethyl 13-tetrahydropyranyloxy-2(E)-tridecenoate (VI).LAH reduction of VI in dry benzene affords the alcohol (VII) in good yield.Conversion of the alcohol (VII) into the corresponding mesylate (VIII) with mesyl chloride/triethylamine in dry methylene chloride at 0 deg C, followed by reaction with dimethyl lithiocuprate at -10 deg C under nitrogen atmosphere provides the pyranyl ether (IX) which upon removal of the protective group with conc.HCl in methanol gives the naturally occurring sex pheromone (E)-11-tetradecen-1-ol (I).
- Vig, O. P.,Sharma, M. L.,Verma, N. K.,Malik, Neera
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p. 581 - 582
(2007/10/02)
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- INSECT SEX PHEROMONES. STEREOSELECTIVE SYNTHESIS OF SEVERAL (Z)- AND (E)-ALKEN-1-OLS, THEIR ACETATES, AND OF (9Z,12E)-9,12-TETRADECADIEN-1-YL ACETATE
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Several female sex pheromone components produced by moths belonging to the order of Lepidoptera, and potential attractants of Dacus oleae (Diptera:Tripetidae) have been synthesized in high chemical and stereoisomeric purity by improved acetylenic routes involving alkylation of lithium 1-alkyn-1-ides in HMPT, followed by (Z) and (E) highly stereoselective reduction of the derived internal alkynes.Particular care has been paid to optimize the parameters of the reactions used and to evaluate the chemical and isomeric purity of the reaction products.The compounds synthesized include (Z)- and (E)-5-nonen-1-ol, (Z)- and (E)-7-dodecen-1-yl acetate, (Z)- and (E)-7-teradecen-1-yl acetate, (Z)- and (E)-7-nonen-1-ol, (Z)- and (E)-9-tetradecen-1-yl acetate, (Z)- and (E)-10-tetradecen-1-yl acetate, (Z)- and (E)-11-tetradecen-1-yl acetate.Pure (Z)-6-nonen-1-ol, which is an attractant of olive fruit fly, D. oleae, and very probably, a constituent of the sex pheromone of females of this insect, has been prepared by a rather efficient copper-catalyzed reaction between (Z)-3-hexen-1-ylmagnesium bromide and oxetane. (9Z,12E)-9,12-Tetradecadien-1-yl acetate, which is the pheromone of Anagasta kuenniella, Ephestia elutella, Cadra figulella, Spodoptera exigua, S. litura, and a component of the sex pheromones of several other Lepidoptera, has been conveniently prepared by using the copper-catalyzed coupling reaction between (E)-1-chloro-2-butene and 10-tetrahydropyranyloxy-1-decenylmagnesium bromide, followed by acetylation and Z-stereoselective reduction of the derived 1,4-enyne.All syntheses have been conducted on a scale to yield less than 50 mmol of the pure sex pheromone components, but seem adaptable for much larger quantities.
- Rossi, Renzo,Carpita, Adriano,Gaudenzi, Loretta,Quirici, Maria Grazia
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p. 237 - 246
(2007/10/02)
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