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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51条记录   Helically Foldable Diphenylureas as Anion Receptors: Modulation of the Binding Affinity by the Chain Length [作者：KIM MIN JUNG; LEE HYEWON; MOON DOHYUN; JEONG KYUSUNG,期刊：Organic Letters, 页码：5042-5045 , 文章类型： Article，,卷期：2012年14-19] Using a series of diphenylureas capable of folding to helical conformations, the binding trends have been compared between two anions of different sizes, chloride and sulfate. The binding constant for the sulfate ion ste... Enantioselective Total Synthesis of (+)-Lithospermic Acid [作者：GHOSH ARUN K; CHENG XU; ZHOU BING,期刊：Organic Letters, 页码：5046-5049 , 文章类型： Article，,卷期：2012年14-19] An enantioselective synthesis of (+)-lithospermic acid, a potent anti-HIV agent, has been accomplished in a convergent manner in nine steps. The synthesis features an enantioselective intramolecular oxa-Michael addition ... Structure and Biosynthesis of the Antibiotic Bottromycin D [作者：HOU YANPENG; TIANERO MA DIAREY B; KWAN JASON C; WYCHE THOMAS P; MICHEL COLE R; ELLIS GREGORY A; VAZQUEZRIVERA EMMANUEL; BRAUN DOUG R; ROSE WARREN E; SCHMIDT ERIC W; BUGNI TIM S,期刊：Organic Letters, 页码：5050-5053 , 文章类型： Article，,卷期：2012年14-19] Drug resistant infectious diseases are quickly becoming a global health crisis. While Streptomyces spp. have been a major source of antibiotics over the past 50 years, efficient methods are needed to identify new antibio... Yeast-Mediated Xanthone Synthesis through Oxidative Intramolecular Cyclization [作者：FROMENTIN YANN; GRELLIER PHILIPPE; WANSI JEAN DUPLEX; LALLEMAND MARIECHRISTINE; BUISSON DIDIER,期刊：Organic Letters, 页码：5054-5057 , 文章类型： Article，,卷期：2012年14-19] Benzoylphloroglucinol derivatives are natural products showing diverse biological activities that could be modulated by structural modifications. For this purpose, we studied the biotransformation of guttiferone A and of... Preparation of Brominated 2-Alkoxythiophenes via Oxidation and Etherification of 2-Thienyltrifluoroborate Salts [作者：TIETZ JONATHAN I; SEED ALEXANDER J; SAMPSON PAUL,期刊：Organic Letters, 页码：5058-5061 , 文章类型： Article，,卷期：2012年14-19] The synthesis of ring brominated long-chain 2-alkoxythiophenes is reported, involving mild (Ozone) oxidation of readily prepared 2-thienyltrifluoroborate salts followed by Mitsunobu etherification. Both procedures are op... A Reaction-Based Sensing Scheme for Gold Species: Introduction of a (2-Ethynyl)benzoate Reactive Moiety [作者：SEO HYEWON; JUN MI EUN; EGOROVA OLGA A; LEE KYUNGHA; KIM KYONGTAI; AHN KYO HAN,期刊：Organic Letters, 页码：5062-5065 , 文章类型： Article，,卷期：2012年14-19] To alleviate side reactions identified in an N-propargyl-rhodamine lactam sensing system, we devised the novel reaction-based sensing scheme for gold species based on the alkynophilicity. A fluorescein (2-ethynyl)benzoat... Modular Synthesis of Bipyridinium Oligomers and Corresponding Donor-Acceptor Oligorotaxanes with Crown Ethers [作者：GOTHARD CHRIS M; BRUNS CARSON J; GOTHARD NOSHEEN A; GRZYBOWSKI BARTOSZ A; STODDART J FRASER,期刊：Organic Letters, 页码：5066-5069 , 文章类型： Article，,卷期：2012年14-19] Donor-acceptor [4]- and [6]rotaxanes have been prepared from bipyridinium (BIPY2+) oligomers and 1,5-dinaphtho[38]crown-10 (DN38C10) by a threading-followed-by-stoppering protocol employing click chemistry. An efficient,... Controlling Ion-Sensing Specificity of N-Amidothioureas: From Anion-Selective Sensors to Highly Zn2+-Selective Sensors by Tuning Electronic Effects [作者：CHEN HUALONG; GUO ZHIFO; LU ZHONGLIN,期刊：Organic Letters, 页码：5070-5073 , 文章类型： Article，,卷期：2012年14-19] N-Amidothioureas bearing nitro groups showed different sensitivities to various anions, while those with methoxy moieties exhibited the sensitive and selective fluorescence turn-on property for Zn2+ in aqueous solution a... Tertiary Amine-Triggered Cascade S(N)2/Cycloaddition: An Efficient Construction of Complex Azaheterocycles under Mild Conditions [作者：HU JIAN; TIAN BING; WU XINYAN; TONG XIAOFENG,期刊：Organic Letters, 页码：5074-5077 , 文章类型： Article，,卷期：2012年14-19] In this paper, an amine-triggered cascade S(N)2/cycloaddtion sequence between 2-(acetoxymethyl)buta-2,3-dienoate 1 and various pi-system functionalized tosylamides 3 has been reported, which provides a facile method for ... Oxidative Cleavage of alpha-Aryl Aldehydes Using Iodosylbenzene [作者：HAVARE NIZAM; PLATTNER DIETMAR A,期刊：Organic Letters, 页码：5078-5081 , 文章类型： Article，,卷期：2012年14-19] We found that a-aryl aldehydes can be cleaved to chain-shortened carbonyl compounds and formaldehyde by various iodosylbenzene complexes. A mechanistic scheme is presented that accounts for the loss of one carbon atom. F... Hydrogen Bonding Directed Intermolecular Cope-Type Hydroamination of Alkenes [作者：ZHAO SHUBIN; BILODEAU ERIC; LEMIEUX VALERIE; BEAUCHEMIN ANDRE M,期刊：Organic Letters, 页码：5082-5085 , 文章类型： Article，,卷期：2012年14-19] Intermolecular hydroamination of unactivated alkenes represents a significant synthetic challenge. An efficient Cope-type hydroamination is achieved under mild conditions for reactions of N-alkylhydroxylamines with allyl... Natural Product Disaccharide Engineering through Tandem Glycosyltransferase Catalysis Reversibility and Neoglycosylation [作者：PELTIERPAIN PAULINE; MARCHILLO KAREN; ZHOU MAOQUAN; ANDES DAVID R; THORSON JON S,期刊：Organic Letters, 页码：5086-5089 , 文章类型： Article，,卷期：2012年14-19] A two-step strategy for disaccharide modulation using vancomycin as a model is reported. The strategy relies upon a glycosyltransferase-catalyzed 'reverse' reaction to enable the facile attachment of an alkoxyamine-beari... Pyrrolo[1,2-a]quinoxalines: Novel Synthesis via Annulation of 2-Alkylquinoxalines [作者：AMMERMANN SVEN; HRIB CHRISTIAN; JONES PETER G; DU MONT WOLFWALTHER; KOWALSKY WOLFGANG; JOHANNES HANSHERMANN,期刊：Organic Letters, 页码：5090-5093 , 文章类型： Article，,卷期：2012年14-19] In an attempt to synthesize a novel homoleptic complex 3 from 2-methyl-3-phenylquinoxaline 1 and Ir(acac)(3) for application as a triplet emitter in OLEDs (organic light-emitting diodes) no cyclometalation was observed. ... Enantioselective Route to Ketones and Lactones from Exocyclic Allylic Alcohols via Metal and Enzyme Catalysis [作者：WARNER MADELEINE C; NAGENDIRAN ANUJA; BOGAR KRISZTIAN; BACKVALL JANE,期刊：Organic Letters, 页码：5094-5097 , 文章类型： Article，,卷期：2012年14-19] A general and efficient route for the synthesis of enantiomerically pure a-substituted ketones and the corresponding lactones has been developed. Ruthenium- and enzyme-catalyzed dynamic kinetic resolution (DKR) with a su... Experimental and Theoretical Investigation of (1)J(CC) and (n)J(CC) Coupling Constants in Strychnine [作者：WILLIAMSON R THOMAS; BUEVICH ALEXEI V; MARTIN GARY E,期刊：Organic Letters, 页码：5098-5101 , 文章类型： Article，,卷期：2012年14-19] A relatively unexplored and unexploited means of establishing molecular structure, stereochemistry, and probing vicinal bond angles is through the use of long-range C-13-C-13 coupling constants. The measurement of these ... One-Pot Transition-Metal-Free Synthesis of Dibenzo[b,f]oxepins from 2-Halobenzaldehydes [作者：CHOI YOUNG LOK; LIM HYE SUN; LIM HWAN JUNG; HEE JUNGNYOUNG,期刊：Organic Letters, 页码：5102-5105 , 文章类型： Article，,卷期：2012年14-19] A one-pot transition-metal-free, base-mediated synthesis of dibenzo[b,f]oxepins was developed. The reaction of 2-halobenzaldehydes with (2-hydroxyphenyl)acetonitriles proceeds via a sequential aldol condensation and intr...