- Zwitterionic Phosphonium Sulfonates as Easily Phase-Separable Ion-Tagged Wittig Reagents.
[作者:Huo, Congde;He, Xun;Chan, Tak Hang;,期刊:Journal of Organic Chemistry, 页码:8583-8586 , 文章类型: 研究论文,,卷期:2008年73-21]
- Zwitterionic phosphonium sulfonates, i.e. I, conveniently derived from TPPMS II.Na, can be used as Wittig reagents in soln. The excess reagents and byproduct TPPMSO can be easily sepd. from the product alkenes by simple...
- Efficient Negishi Coupling Reactions of Aryl Chlorides Catalyzed by Binuclear and Mononuclear Nickel-N-Heterocyclic Carbene Complexes.
[作者:Xi, Zhenxing;Zhou, Yongbo;Chen, Wanzhi;,期刊:Journal of Organic Chemistry, 页码:8497-8501 , 文章类型: 研究论文,,卷期:2008年73-21]
- 29 We describe the first nickel-N-heterocyclic carbene catalyzed Negishi cross-coupling reaction of a variety of unactivated aryl chlorides, heterocyclic chlorides, aryl dichlorides, and vinyl chloride. The mononuclear ...
- Synthesis and Characterization of New 2,3-Disubstituted Thieno[3,4-b]pyrazines: Tunable Building Blocks for Low Band Gap Conjugated Materials.
[作者:Wen, Li;Nietfeld, Jon P.;Amb, Chad M.;Rasmussen, Seth C.;,期刊:Journal of Organic Chemistry, 页码:8529-8536 , 文章类型: 研究论文,,卷期:2008年73-21]
- Synthetic methods have been developed for the prepn. of novel 2,3-dihalothieno[3,4-b]pyrazines I (X = Cl, Br, CH2Br), from which a variety of 2,3-difunctionalized thieno[3,4-b]pyrazines I (X = CN, n-C5H11O, Me(OCH2CH2)3O...
- 1,2,3,4-Tetrahydro-8-hydroxyquinoline-promoted copper-catalyzed coupling of nitrogen nucleophiles and aryl bromides.
[作者:Wang, Huifeng;Li, Yaming;Sun, Fangfang;Feng, Yang;Jin, Kun;Wang, Xiuna;,期刊:Journal of Organic Chemistry, 页码:8639-8642 , 文章类型: 研究论文,,卷期:2008年73-21]
- Based on the dramatic accelerating effect of 2-aminophenol, three ligands derived from 2-aminophenol were developed. Copper-catalyzed coupling reaction of nitrogen-contg. nucleophiles with aryl bromides was efficiently c...
- Pyrrolo[2,1-b]thiazole Derivatives by Asymmetric 1,3-Dipolar Reactions of Thiazolium Azomethine Ylides to Activated Vinyl Sulfoxides.
[作者:Garcia Ruano, Jose Luis;Fraile, Alberto;Martin, M. Rosario;Gonzalez, Gema;Fajardo, Cristina;,期刊:Journal of Organic Chemistry, 页码:8484-8490 , 文章类型: 研究论文,,卷期:2008年73-21]
- 1,3-Dipolar reactions of thiazolium azomethine ylides, generated in situ from thiazolium salts I (R1 = H, MeCO), to enantiopure cyclic and acyclic vinyl sulfoxides, e.g. II [R2 = (R)-4-MeC6H4S(O)], provided an efficient ...
- Enantioselective Organocatalytic Approach to a-Methylene-d-lactones and d-Lactams.
[作者:Albrecht, Lukasz;Richter, Bo;Krawczyk, Henryk;Joergensen, Karl Anker;,期刊:Journal of Organic Chemistry, 页码:8337-8343 , 文章类型: 研究论文,,卷期:2008年73-21]
- We present the first enantioselective organocatalytic approach for the synthesis of a-methylene-d-lactones and d-lactams, e.g. I (R = iso-Pr, Et, tert-Bu, X = O, NPh). Our methodol. utilizes the Michael addn. of unmodif...
- Fast, Acid-Free, and Selective Lactamization of Lactones in Ionic Liquids.
[作者:Orrling, Kristina M.;Wu, Xiongyu;Russo, Francesco;Larhed, Mats;,期刊:Journal of Organic Chemistry, 页码:8627-8630 , 文章类型: 研究论文,,卷期:2008年73-21]
- A fast and acid-free one-pot 0.2-30 mmol microwave methodol. for direct ionic liq.-mediated prepn. of lactams from lactones and primary amines has been developed. The protocol was investigated with a wide range of prima...
- Gold-Catalyzed Hydrative Carbocyclization of 1,5- and 1,6-Diyn-3-ones via an Oxygen Transfer Process.
[作者:Tang, Jhih-Meng;Liu, Ting-An;Liu, Rai-Shung;,期刊:Journal of Organic Chemistry, 页码:8479-8483 , 文章类型: 研究论文,,卷期:2008年73-21]
- 24 This study reports new hydrative carbocyclizations of 1,5- and 1,6-diyn-3-ones catalyzed by PPh3AuOTf, involving a p-alkyne-assisted oxygen transfer in the reaction mechanisms. Treatment of 2-(1-oxo-2-alkynyl)-1-alky...
- Organocatalytic methods for chemoselective O-tert-butoxycarbonylation of phenols and their regeneration from the O-t-Boc derivatives.
[作者:Chankeshwara, Sunay V.;Chebolu, Rajesh;Chakraborti, Asit K.;,期刊:Journal of Organic Chemistry, 页码:8615-8618 , 文章类型: 研究论文,,卷期:2008年73-21]
- Carbon tetrabromide (CBr4) catalyzes O-tert-butoxycarbonylation of functionalized phenols without any side reactions (bromination, addn. of CBr3 to a double bond, and formation of sym. diaryl carbonates, cyclic carbonate...
- Palladium- and nickel-catalyzed cross-couplings of unsaturated halides bearing relatively acidic protons with organozinc reagents.
[作者:Manolikakes, Georg;Munoz Hernandez, Carmen;Schade, Matthias A.;Metzger, Albrecht;Knochel, Paul;,期刊:Journal of Organic Chemistry, 页码:8422-8436 , 文章类型: 研究论文,,卷期:2008年73-21]
- 23, 27 A wide range of polyfunctional aryl, heteroaryl, alkyl, and benzylic zinc reagents were coupled with unsatd. aryl halides bearing an acidic NH or OH proton, using Pd(OAc)2 (1 mol %) and S-Phos (2 mol %) as catalys...
- Fluoro-Julia Olefination as a Mild, High-Yielding Route to a-Fluoro Acrylonitriles.
[作者:del Solar, Maria;Ghosh, Arun K.;Zajc, Barbara;,期刊:Journal of Organic Chemistry, 页码:8206-8211 , 文章类型: 研究论文,,卷期:2008年73-21]
- A novel, stable reagent, (1,3-benzothiazol-2-ylsulfonyl)fluoroacetonitrile (I), was synthesized from readily available Et a-(1,3-benzothiazol-2-ylsulfanyl)-a-fluoroacetate. The condensation of I with various aldehydes R...
- Selective Nitroaldol Condensations over Heterogeneous Catalysts in the Presence of Supercritical Carbon Dioxide.
[作者:Ballini, Roberto;Noe, Marco;Perosa, Alvise;Selva, Maurizio;,期刊:Journal of Organic Chemistry, 页码:8520-8528 , 文章类型: 研究论文,,卷期:2008年73-21]
- At 40-60 癈, in the presence of heterogeneous catalysts based on Al2O3, supercrit. carbon dioxide not only acts as a good solvent for the reaction of arom. and aliph. aldehydes R1CHO (R1 = n-C6H13, n-C9H19, Ph, 4-ClC6H4, ...
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