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文章名     作者     期刊名     摘要     卷     期         如果没有找到您所需要的文献，请点击 ——此处申请     共77条记录   Surprisingly Low Aqueous Acidity at the a-Positions of Pyridiniums and Pyrimidinium: The Role of Solvation. [作者：Wong, Freeman M.;Capule, Christina C.;Chen, David X.;Gronert, Scott;Wu, Weiming;,期刊：Organic Letters, 页码：2757-2760 , 文章类型： 研究论文，,卷期：2008年10-13] The pKa's of the 6-CH groups of N-methyl-2-methoxypyridinium, N-methyl-4-methoxypyridinium, and 1-methyl-2,4-dimethoxypyrimidinium ions in aq. soln. were detd. to be about 33. The pKa values were nearly identical to eac... Origins of Selectivity in a Colorimetric Charge-Transfer Sensor for Diols. [作者：Rasberry, Roger D.;Smith, Mark D.;Shimizu, Ken D.;,期刊：Organic Letters, 页码：2889-2892 , 文章类型： 研究论文，,卷期：2008年10-13] Bispyridyl hydrogen bonding receptor 1 forms colored charge transfer (CT) complexes with complementary phenols and naphthols. Despite its low assocn. consts. of ~101 M-1, receptor 1 was highly selective forming CT compl... Rhodium-Catalyzed Regio- and Stereoselective Codimerization of Alkenes and Electron-Deficient Internal Alkynes Leading to 1,3-Dienes. [作者：Shibata, Yu;Hirano, Masao;Tanaka, Ken;,期刊：Organic Letters, 页码：2829-2831 , 文章类型： 研究论文，,卷期：2008年10-13] A cationic rhodium(I)/H8-BINAP complex catalyzes codimerization of alkenes R1CH:CH2 (R1 = CO2Bu-t, Ph, SiMe3, etc) bearing no a-hydrogen and electron-deficient internal alkynes, e.g. R2CYCCO2R3 (R2 = Me, Ph, Co2Me, R3 = ... Efficient and Versatile Synthesis of New Porphyrins Bearing an N3O Moiety: Ligands for Mimicking Cytochrome c Oxidase. [作者：Ruzie, Christian;Even-Hernandez, Pascale;Boitrel, Bernard;,期刊：Organic Letters, 页码：2673-2676 , 文章类型： 研究论文，,卷期：2008年10-13] Two new generations of ligands (I; X = m-C6H4, CH2, R1 = NO2, R2 = OH; X = m-C6H4, R1 = R2 = H) for cytochrome c oxidase mimicking were designed and synthesized via an efficient, convergent, and versatile synthesis. The... Photogeneration and Thermal Generation of Pentacene from Soluble Precursors for OTFT Applications. [作者：Chuang, Ta-Hsien;Hsieh, Hsing-Hung;Chen, Chang-Ken;Wu, Chung-Chih;Lin, Chao-Chen;Chou, Pi-Tai;Chao, Ting-Han;Chow, Tahsin J.;,期刊：Organic Letters, 页码：2869-2872 , 文章类型： 研究论文，,卷期：2008年10-13] A CO adduct of pentacene with an unsym. structure was synthesized; it is sol. and can be spin-coated into thin films. Pentacene is regenerated in near quant. yield by either thermal or photoinduced elimination of CO. O... Diastereoselective Pictet-Spengler approach for the synthesis of pyrrolo[3,2-e][1,4]diazepin-2-one peptide turn mimics. [作者：Deaudelin, Philippe;Lubell, William D.;,期刊：Organic Letters, 页码：2841-2844 , 文章类型： 研究论文，,卷期：2008年10-13] Sixteen pyrrolo[3,2-e][1,4]diazepin-2-ones were synthesized in 4-5 steps and 5-48% overall yields from 4-oxoproline by a route featuring a diastereoselective Pictet-Spengler reaction to close the seven-membered diazepino... Total Synthesis and Structural Confirmation of ent-Galbanic Acid and Marneral. [作者：Corbu, Andrei;Perez, Manuel;Aquino, Maurizio;Retailleau, Pascal;Arseniyadis, Simeon;,期刊：Organic Letters, 页码：2853-2856 , 文章类型： 研究论文，,卷期：2008年10-13] By capitalizing on a highly selective Claisen rearrangement, ent-galbanic acid I and (+)-marneral II have been synthesized. The relative configurations of (+)-I and (+)-II were unambiguously established by X-ray crystal... Effective Pd-Nanoparticle (PdNP)-Catalyzed Negishi Coupling Involving Alkylzinc Reagents at Room Temperature. [作者：Liu, Jing;Deng, Yi;Wang, Haibo;Zhang, Hua;Yu, Ganxiang;Wu, Bingbin;Zhang, Heng;Li, Qiang;Marder, Todd B.;Yang, Zhen;Lei, Aiwen;,期刊：Organic Letters, 页码：2661-2664 , 文章类型： 研究论文，,卷期：2008年10-13] Pd(OAc)2 is an efficient catalyst precursor for Negishi coupling in the presence of Bu4NBr. Secondary and primary alkylzinc reagents with b-H and arylzinc reagents all reacted with aryl iodides at temps. as low as -20 癈... Cross Interaction Between Auxiliaries: The Chirality of Amino Alcohols by NMR. [作者：Leiro, Victoria;Seco, Jose Manuel;Quinoa, Emilio;Riguera, Ricardo;,期刊：Organic Letters, 页码：2729-2732 , 文章类型： 研究论文，,卷期：2008年10-13] The abs. configuration of sec/prim- and prim/sec-1,2-amino alcs. is detd. by comparison of the 1H NMR chem. shifts of the auxiliary OMe or CaH groups at the corresponding bis-(R) and bis-(S)-MPA derivs. This is the first... Phenothiazinophanes: synthesis, structure, and intramolecular electronic communication. [作者：Memminger, Karin;Oeser, Thomas;Mueller, Thomas J. J.;,期刊：Organic Letters, 页码：2797-2800 , 文章类型： 研究论文，,卷期：2008年10-13] Ortho-phenylene, ethenylene, and ethylene-bridged phenothiazinophanes are synthesized by Suzuki coupling or McMurry dimerization and catalytic hydrogenation at ambient pressure. Intensive intramol. electronic communicati... Cyclophane capsule motifs with side pockets. [作者：Kang, Sung Ok;Day, Victor W.;Bowman-James, Kristin;,期刊：Organic Letters, 页码：2677-2680 , 文章类型： 研究论文，,卷期：2008年10-13] Neutral and charged multitopic cyclophane-capped anion hosts connected by three or four diamide/monoamine chains and a decompn. product with two chains have been synthesized and characterized. The chains in the two form... A Nonafluoro Nucleoside as a Sensitive 19F NMR Probe of Nucleic Acid Conformation. [作者：Barhate, Nivrutti B.;Barhate, Rekha N.;Cekan, Pavol;Drobny, Gary;Sigurdsson, Snorri Th.;,期刊：Organic Letters, 页码：2745-2747 , 文章类型： 研究论文，,卷期：2008年10-13] a Sonogashira coupling of 5-iodo-2'-deoxyuridine with 4,4,4-trifluoro-3,3-bis(trifluoromethyl)-1-butyne in nearly quant. yield and subsequently incorporated into DNA oligomers. Thermal denaturation studies showed that 4... Palladium-Catalyzed Chloroimination of Imidoyl Chlorides to a Triple Bond: An Intramolecular Reaction Leading to 4-Chloroquinolines. [作者：Isobe, Akira;Takagi, Jun;Katagiri, Toshimasa;Uneyama, Kenji;,期刊：Organic Letters, 页码：2657-2659 , 文章类型： 研究论文，,卷期：2008年10-13] In this paper, a new type of effective chloroimination was reported. This reaction afforded 4-chloro-2-polyfluoroalkyl quinolines from fluorinated imidoyl chlorides in high yields. E.g., in presence of Pd2(dba)3, BINAP... Asymmetric Synthesis of Carboxylic Acid Derivatives Having an All-Carbon a-Quaternary Center through Cu-Catalyzed 1,4-Addition of Dialkylzinc Reagents to 2-Aryl Acetate Derivatives. [作者：Wilsily, Ashraf;Fillion, Eric;,期刊：Organic Letters, 页码：2801-2804 , 文章类型： 研究论文，,卷期：2008年10-13] The asym. synthesis of carboxylic acid derivs. having an all-carbon a-quaternary center, e.g. I, has been achieved via copper-catalyzed 1,4-addn. of dialkylzinc reagents to aryl acetate derivs., e.g. II, in the presence ... N-Propargylic b-Enaminones: Common Intermediates for the Synthesis of Polysubstituted Pyrroles and Pyridines. [作者：Cacchi, Sandro;Fabrizi, Giancarlo;Filisti, Eleonora;,期刊：Organic Letters, 页码：2629-2632 , 文章类型： 研究论文，,卷期：2008年10-13] N-Propargylic b-enaminones have been used as common intermediates for the synthesis of polysubstituted pyrroles and pyridines. The best results have been obtained using DMSO as solvent. In the presence of Cs2CO3 N-prop... Oxidative Rearrangements of Isobenzofurans: Studies toward the Synthesis of the Ajudazols. [作者：Hobson, Stephen J.;Parkin, Andrew;Marquez, Rodolfo;,期刊：Organic Letters, 页码：2813-2816 , 文章类型： 研究论文，,卷期：2008年10-13] We present a new facet of isobenzofuran chem. which allows for its efficient manipulation to generate biol. relevant entities, e.g. I. This methodol. has been successfully applied toward the synthesis of ajudazol A inte...