个性化文献订阅>文章检索

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48条记录   On Resin Side-Chain Cyclization of Complex Peptides Using CuAAC [作者：INGALE SAMPAT; DAWSON PHILIP E,期刊：Organic Letters, 页码：2822-2825 , 文章类型： Article，,卷期：2011年13-11] Triazole tethers have been explored for stabilization of secondary structures in peptides. Despite the utility of this approach, cyclization efficiency in complex peptides remains a significant challenge. A robust, on-re... Redox Potential Inversion by Ionic Hydrogen Bonding between Phenylenediamines and Pyridines [作者：CHUNG YICHUN; TU YIJUNG; LU SHIHHUA; HSU WANCHI; CHIU KUO YUAN; SU YUHLONG OLIVER,期刊：Organic Letters, 页码：2826-2829 , 文章类型： Article，,卷期：2011年13-11] In electrochemical oxidations, the second oxidation potential of phenylenediamines (PD) varies because of hydrogen-bonding formation for PD+center dot with pyridines. A linear relationship was obtained for the potential ... Enantioselective Pd(II)-Catalyzed Aerobic Oxidative Amidation of Alkenes and Insights into the Role of Electronic Asymmetry in Pyridine-Oxazoline Ligands [作者：MCDONALD RICHARD I; WHITE PAUL B; WEINSTEIN ADAM B; TAM CHUN PONG; STAHL SHANNON S,期刊：Organic Letters, 页码：2830-2833 , 文章类型： Article，,卷期：2011年13-11] Enantioselective intramolecular oxidative amidation of alkenes has been achieved using a (pyrox)Pd(II)(TFA)(2) catalyst (pyrox = pyridine-oxazoline, TFA = trifluoroacetate) and 02 as the sole stoichiometric oxidant. The ... Syntheses of alpha-Pyrones Using Gold-Catalyzed Coupling Reactions [作者：LUO TUOPING; DAI MINGJI; ZHENG SHAOLIANG; SCHREIBER STUART L,期刊：Organic Letters, 页码：2834-2836 , 文章类型： Article，,卷期：2011年13-11] Sequential alkyne activation of terminal alkynes and propiolic acids by gold(1) catalysts yields compounds having alpha-pyrone skeletons. Novel cascade reactions involving propiolic acids are reported that give rise to a... Neighboring Pyrrolidine Amide Participation in Thioether Oxidation. Methionine as a "Hopping" Site [作者：GLASS RICHARD S; SCHOENEICH CHRISTIAN; WILSON GEORGE S; NAUSER THOMAS; YAMAMOTO TAKUHEI; LORANCE EDWARD; NICHOL GARY S; AMMAM MALIKA,期刊：Organic Letters, 页码：2837-2839 , 文章类型： Article，,卷期：2011年13-11] Methionine residues have been shown to function as efficient "hopping" sites in long-range electron transfer in model polyprolyl peptides. We suggest that a key to this ability of methionine is stabilization of the trans... Notable Structural Property of 2,4,6-Tri-tert-butylanilide Enolates: Interconversion between the Rotamers and Their Reactivity [作者：OHNISHI YUSUKE; SAKAI MASAHI; NAKAO SHOUTA; KITAGAWA OSAMU,期刊：Organic Letters, 页码：2840-2843 , 文章类型： Article，,卷期：2011年13-11] Interconversion between the separable 2,4,6-tri-tert-butylanilide rotamers was found to easily occur through formation of the lithium enolate. Protonation of the anilide enolate gave the anilide rotamer mixture of E-majo... A Facile Access to Enantiomerically Pure [60]Fullerene Bisadducts with the Inherently Chiral Trans-3 Addition Pattern [作者：RIALA MARIA; CHRONAKIS NIKOS,期刊：Organic Letters, 页码：2844-2847 , 文章类型： Article，,卷期：2011年13-11] The Bingel reaction between C-60 and an enantiopure bismalonate tether equipped with two acetonide moieties led to the synthesis and successful column chromatographic isolation of the enantiomerically pure C-f,C-s and (f... Synthesis of Benzocycloheptanones through Coupling of delta,epsilon-Unsaturated Chromium Carbene Complexes and 2-Alkynylbenzoyl Derivatives [作者：PATTI RAJESH KUMAR; WAYNANT KRISTOPHER V; HERNDON JAMES W,期刊：Organic Letters, 页码：2848-2851 , 文章类型： Article，,卷期：2011年13-11] The coupling of pentenylcarbene complexes and 2-alkynylbenzoyl derivatives affords naphthocycloheptanones in a single step involving simultaneous construction of both the seven-membered ring and one of the aromatic rings... New C15-Substituted Active Vitamin D-3 [作者：SHINDO KANAKO; KUMAGAI GO; TAKANO MASASHI; SAWADA DAISUKE; SAITO NOZOMI; SAITO HIROSHI; KAKUDA SHINJI; TAKAGI KENICHIRO; OCHIAI EIJI; HORIE KYOHEI; TAKIMOTOKAMIMURA MIDORI; ISHIZUKA SEIICHI; TAKENOUCHI KAZUYA; KITTAKA ATSUSHI,期刊：Organic Letters, 页码：2852-2855 , 文章类型： Article，,卷期：2011年13-11] C15-Substituted 1 alpha,25-dihydroxyvitamin D-3 analogs were synthesized for the first time to investigate the effects of the modified CD-ring on biological activity concerning the agonistic positioning of helix-3 and he... Machilusides A and B: Structurally Unprecedented Homocucurbitane Glycosides from the Stem Bark of Machilus yaoshansis [作者：LIU MINGTAO; GAN MAOLUO; LIN SHENG; ZHANG YANLING; ZI JIACHEN; SONG WEIXIA; FAN XIAONA; LIU YING; YANG YONGCHUN; SHI JIANGONG,期刊：Organic Letters, 页码：2856-2859 , 文章类型： Article，,卷期：2011年13-11] Two structurally novel homocucurbitane triterpenoid glycosides, machilusides A (1) and B (2), possessing an unprecedented C-36 skeleton with a D-fructose moiety incorporated into a cucurbitane nucleus forming unique cage... Copper-Catalyzed Direct Amination of Electron-Deficient Arenes with Hydroxylamines [作者：MATSUDA NAOKI; HIRANO KOJI; SATOH TETSUYA; MIURA MASAHIRO,期刊：Organic Letters, 页码：2860-2863 , 文章类型： Article，,卷期：2011年13-11] The C-H amination of electron-deficient arenes such as polyfluoroarenes and azole compounds with O-acylated hydroxylamines effectively proceeds in the presence of a copper catalyst even at room temperature to provide the... Asymmetric Total Synthesis of (-)-Scabronine G via Intramolecular Double Michael Reaction and Prins Cyclization [作者：KANOH NAOKI; SAKANISHI KOHEI; IIMORI EMIKO; NISHIMURA KENICHI; IWABUCHI YOSHIHARU,期刊：Organic Letters, 页码：2864-2867 , 文章类型： Article，,卷期：2011年13-11] The enantioselective total synthesis of (-)-scabronine G is described. The key features of the present synthesis include the construction of a 5-6 ring system containing two quaternary carbon centers via a diastereoselec... Palladium-Catalyzed Domino C-S Coupling/Carbonylation Reactions: An Efficient Synthesis of 2-Carbonylbenzo[b]thiophene Derivatives [作者：ZENG FANLONG; ALPER HOWARD,期刊：Organic Letters, 页码：2868-2871 , 文章类型： Article，,卷期：2011年13-11] A facile and selective palladium-catalyzed domino procedure has been developed for the preparation of 2-carbonylbenzo[b]thiophene derivatives from 2-gem-dihalovinylthiophenols. This protocol involves intramolecular C-S c... The First [2]Pseudorotaxane and the First Pseudocryptand-Type Poly[2]pseudorotaxane Based on Bis(meta-phenylene)-32-Crown-10 and Paraquat Derivatives [作者：NIU ZHENBIN; SLEBODNICK CARLA; BONRAD KLAUS; HUANG FEIHE; GIBSON HARRY W,期刊：Organic Letters, 页码：2872-2875 , 文章类型： Article，,卷期：2011年13-11] By the self-assembly of a bis(meta-phenylene)-32-crown-10 bearing two electron-donating groups (carbazoles) with electron-accepting paraquat derivatives, the first [2]pseudorotaxane and the first pseudocryptand-type poly... Potassium Hydroxide/Dimethyl Sulfoxide Promoted Intramolecular Cyclization for the Synthesis of Benzimidazol-2-ones [作者：BEYER ASTRID; REUCHER CHRISTINE M M; BOLM CARSTEN,期刊：Organic Letters, 页码：2876-2879 , 文章类型： Article，,卷期：2011年13-11] A new protocol for intramolecular N-arylations of ureas to form benzimidazol-2-ones has been developed. The cyclization reaction occurs In the presence of KOH and DMSO at close to ambient temperature. Under these conditi... Synthesis of Tetrachloro-azapentacene as an Ambipolar Organic Semiconductor with High and Balanced Carrier Mobilities [作者：SONG CHENGLI; MA CHONGBO; YANG FENG; ZENG WEIJING; ZHANG HAOLI; GONG XIONG,期刊：Organic Letters, 页码：2880-2883 , 文章类型： Article，,卷期：2011年13-11] Two new azapentacene derivatives 9,10-dibromo-6,13-bis(triisopropylsilylethynyl)-1-azapentacene (a) and 8,9,10,11-tetrachloro-6,13-bis(triisopropyisilylethynyl)-1-azapentacene (b) were synthesized, and their FET properti...