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Hokkaido University Collection of Scholarly and Academic Papers (53.434 recursos)
HUSCAP (Hokkaido University Collection of Scholarly and Academic Papers) contains peer-reviewed journal articles, proceedings, educational resources and any kind of scholarly works of Hokkaido University.

Mostrando recursos 1 - 20 de 41

1. Stereoselective synthesis of insect sex pheromone analogs having a fluorine atom on their double bonds - Guan, Tong; Yoshida, Masanori; Ota, Daisuke; Fukuhara, Tsuyoshi; Hara, Shoji; ?, ??
Insect sex pheromone analogs having a fluorine atom on their double bonds,(9E,11E)-1-acetoxy-9-fluorotetradecadiene, (10E,12E)-13-fluorohexadecadien-1-ol,(9Z,11E)-1-acetoxy-9-fluorotetradecadiene, (10E,12Z)-13-fluorohexadecadien-1-olwere stereoselectively synthesized using cross-coupling reactions of alkenylboraneswith (E)- or (Z)-2-fluoro-1-iodo-1-alkenes, stereoselectively prepared from 1-alkynes byour currently developed methods.

2. Direct conversion of epoxides to vic-difluorides - Yu, Hong-Wen; Nakano, Yousuke; Fukuhara, Tsuyoshi; Hara, Shoji; ?, ??
vic-Difluoro compounds can be directly prepared from epoxides by reaction with Et3N-3HF and DFMBA under microwave irradiation conditions.

3. Synthesis of gem-difluorides from aldehydes using DFMBA - Furuya, Tsukasa; Fukuhara, Tsuyoshi; Hara, Shoji; ?, ??
Synthesis of gem-difluorides from aldehydes was effectively achieved using DFMBA and Et3N-3HF under microwave irradiation or conventional thermal heating.

4. Selective trifluorination of alkyl aryl sulfides using IF5 - Ayuba, Shinichi; Hiramatsu, Chiharu; Fukuhara, Tsuyoshi; Hara, Shoji; ?, ??
In the reaction of IF5 with alkyl aryl sulfides in heptane under reflux conditions, the arylthio group migrated once and three fluorine atoms were selectively introduced on the alkyl chain.

5. Deoxyfluorination of alcohols using N,N-diethyl-?,?-difluoro-(m-methylbenzyl)amine - Kobayashi, Shingo; Yoneda, Atushi; Fukuhara, Tsuyoshi; Hara, Shoji; ?, ??
Deoxyfluorination of alcohols was carried out usingN,N-diethyl-?,?-difluoro-(m-methylbenzyl)amine (DFMBA).

6. Selective synthesis of fluorinated carbohydrates using N,N-diethyl-?,?-difluoro-(m-methylbenzyl)amine - Kobayashi, Shingo; Yoneda, Atushi; Fukuhara, Tsuyoshi; Hara, Shoji; ?, ??
Deoxyfluorination of a hydroxy group in rbohydrates was carried out using N,N-diethyl-?,?-difluoro-(m-methylbenzyl)amine.

7. ?-Fluorination of ?-dicarbonyl compounds using p-iodotoluene difluoride under neutral conditions - Yoshida, Masanori; Fujikawa, Komei; Sato, Saeko; Hara, Shoji; ?, ??
The reaction proceeded under mild conditions and monofluorination of ?-ketoesters, ketoamides, and diketones selectively took place.

8. A Practical Synthetic Method for Iodoarene Difluorides without Fluorine Gas and Mercury Salts - Sawaguchi, Masanori; Ayuba, Shinichi; Hara, Shoji; ?, ??
Iodoarene difluorides were synthesized in three steps from the corresponding iodoarenes without the use of dangerous reagents such as fluorine gas or harmful mercury salts.

9. Effective Fluorination Reaction with Et3N•3HF Under Microwave Irradiation - Inagaki, Tomotake; Fukuhara, Tsuyoshi; Hara, Shoji; ?, ??
Fluorination reaction of epoxides and alkyl mesylates can beeffectively achieved by reaction with Et3N?3HFunder microwave irradiation.

10. Regioselective Synthesis ofFluorohydrines via SN2-Type Ring-Opening of Epoxideswith TBABF-KHF2 - Akiyama, Yuriko; Fukuhara, Tsuyoshi; Hara, Shoji; ?, ??
We found that the ring-opening fluorination of terminal epoxidesusing TBABF-KHF2 proceeds with high selectivity throughthe SN2 mechanism.

11. Fluorination of Ketones Using Iodotoluene Difluoride - Sato, Saeko; Yoshida, Masanori; Hara, Shoji; ?, ??
Fluorination of ketones was achieved by the reaction of silyl enol ethers with iodotoluene difluoride in the presence of BF3·OEt2 and a Et3N·HF complex.

12. Synthesis of (Fluoroalkyl)amines by Deoxyfluorination of Amino Alcohols - Nomoto, Takashi; Fukuhara, Tsuyoshi; Hara, Shoji
Deoxyfluorination of amino alcohols was achieved ­using N,N-diethyl-?,?-difluorobenzylamine (DFBA) to furnish N-benzoyl(fluoroalkyl)amines selectively.

13. Synthesis of ?-Boryl-?,?-unsaturated Carbonyl Compounds via Palladium-Catalyzed Cross-Coupling Reaction of Bis(pinacolato)diboron with Vinyl Triflates - Takagi, Jun; Kamon, Akihiro; Ishiyama, Tatsuo; Miyaura, Norio
Cross-coupling reaction of bis(pinacolato)diboron with ?-(trifluoromethanesulfonyloxy)-?,?-unsaturated carbonyl compounds was carried out in the presence of PdCl2(PPh3)2-2PPh3 (3 mol%) and KOPh in toluene or K2CO3 in dioxane for the synthesis of cyclic and acyclic ?-boryl-?,?-unsaturated esters, amides, and ketones in high yields.

14. Asymmetric Conjugate Additionof Arylboronic Acids to Enones Catalyzed by Rhodium-MonodentatePhosphoramidite Complexes in the Presence of Bases - Iguchi, Yuki; Itooka, Ryoh; Miyaura, Norio
The additionto 2-cyclohexenone achieved enantioselectivities up to 99%,though they were less effective for 2-cyclopentenone (79% ee),2-cycloheptenone (77% ee) and acyclic enones (31-43% ee).

15. Inter- and Intramolecular Additions of 1-Alkenylboronic Acids or Esters to Aldehydes and Ketones Catalyzed by Rhodium(I) Complexes in Basic, Aqueous Solutions - Takezawa, Akinori; Yamaguchi, Kenji; Ohmura, Toshimichi; Yamamoto, Yasunori; Miyaura, Norio
Grignard-type addition reaction of 1-alkenylboronic acids or their esters to aldehydes or ketones were carried out in aqueous MeOH or DME in the presence of KOH (1 equivalent) and an RhCl(dppf) or Rh(OH)(dppf) catalyst (3 mol%).

16. A Palladium-Catalyzed Biaryl Coupling of Arylboronic Acids in Aqueous Media Using A Gluconamide-Substituted Triphenylphosphine (GLCAphos) Ligand - Ueda, Masato; Nishimura, Masato; Miyaura, Norio
A water-soluble phosphine ligand, N-(4-diphenyl-phosphino)phenylmethyl gluconamide (GLCAphos), was newly synthesized to perform the palladium-catalyzed biaryl coupling of arylboronic acids in a single aqueous media.

17. Rhodium-Catalyzed Addition of Arylboronic Acids to N-Sulfonyl Aldimines - Ueda, Masato; Saito, Atsushi; Miyaura, Norio
The addition of arylboronic acids, ArB(OH)2, to N-phenylsulfonyl aldimines, RCH=NSO2Ph (R = alkyl, aryl, 1-alkenyl), giving R(Ar)CHNHSO2Ph was carried out at 95 °C in the presence of a rhodium catalyst.

18. Synthesis of Functionalized Allylsilicone Compounds via Rhodium-Catalyzed Conjugate Addition of (E)- or (Z)-[3-Trimethylsilyl-1-propenyl]boronic Acids to Enones - Yamamoto, Yasunori; Fujita, Masayoshi; Miyaura, Norio
The rhodium-catalyzed conjugate addition of (E)-Me3SiCH2CH=CHB(OiPr)2 or (Z)-Me3SiCH2(C4H9)C=CHB(OiPr)2 to enones provided a novel method for the synthesis of allylsilicone compounds possessing a carbonyl group in the same molecule, which are versatile intermediates for intramolecular allylsilylation, giving cyclobutanols on treatment with Bu4NF.

19. Synthesis of Pinacol Allylic Boronic Esters via Olefin Cross-Metathesis between Pinacol Allylboronate and Terminal or Internal Alkenes - Yamamoto, Yasunori; Takahashi, Miki; Miyaura, Norio
The ruthenium-catalyzed olefin cross-metathesis between pinacol allylboronate, CH2=CHCH2B(O2C2Me4), and RCH=CH2 giving RCH=CHCH2B(O2C2Me4) was carried out in refluxing CH2Cl2 in the presence of an alkylidene-ruthenium complex (3 mol%).

20. ??????????C-H???????????????????????? - ??, ??; Ishiyama, Tatsuo

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