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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64条记录   Near-infrared fluorescent pH-sensitive probes via unexpected barbituric acid mediated synthesis. [作者：Lee, Hyeran;Berezin, Mikhail Y.;Guo, Kevin;Kao, Jeff;Achilefu, Samuel;,期刊：Organic Letters, 页码：29-32 , 文章类型： 研究论文，,卷期：2009年11-1] Novel near-IR pyrimidine-fused pH fluorescent probes were prepd. by an unusual barbiturate-mediated debenzoindolation and subsequent heteroannulation. A plausible mechanistic pathway is proposed, and the final structure... Phenylethynyl-BODIPY oligomers: bright dyes and fluorescent building blocks. [作者：Cakmak, Yusuf;Akkaya, Engin U.;,期刊：Organic Letters, 页码：85-88 , 文章类型： 研究论文，,卷期：2009年11-1] Boradiazaindacene dyes were converted into phenylethynyl-BODIPY oligomers via a cycle of reactions, notably including Sonogashira couplings. As expected, as the no., n, of repeating units increases, peak absorption and ... Triple Hybrids of Steroids, Spiroketals, and Oligopeptides as New Biomolecular Chimeras. [作者：Banerjee, Abhisek;Sergienko, Eduard;Vasile, Stefan;Gupta, Vineet;Vuori, Kristiina;Wipf, Peter;,期刊：Organic Letters, 页码：65-68 , 文章类型： 研究论文，,卷期：2009年11-1] An oxidative enol ether rearrangement was the key methodol. in the construction of steroid-spiroketal-RGD peptides. Biol. studies demonstrated potent integrin CD11b/CD18 antagonistic effects. An Efficient and General Enantioselective Synthesis of Sphingosine, Phythosphingosine, and 4-Substituted Derivatives. [作者：Llaveria, Josep;Diaz, Yolanda;Matheu, M. Isabel;Castillon, Sergio;,期刊：Organic Letters, 页码：205-208 , 文章类型： 研究论文，,卷期：2009年11-1] A general and efficient protocol for the enantioselective synthesis of sphingosine, phythosphingosine, and 4-substituted derivs. was established. These compds. were obtained from a common intermediate prepd. from butadi... Stereoselective Synthesis of 2-Deoxy-b-glycosides Using Anomeric O-Alkylation/Arylation. [作者：Morris, William J.;Shair, Matthew D.;,期刊：Organic Letters, 页码：9-12 , 文章类型： 研究论文，,卷期：2009年11-1] Anomeric O-alkylation/arylation is applied to the synthesis of 2-deoxy-b-glycosides. Treatment of lactols with NaH in dioxane followed by the addn. of electrophiles leads to the formation of 2-deoxy-b-glycosides in high... Synthesis of C14,15-Dihydro-C22,25-epi North Unit of Cephalostatin 1 via "Red-Ox" Modifications of Hecogenin Acetate. [作者：Lee, Seongmin;Jamieson, Daniel;Fuchs, Philip L.;,期刊：Organic Letters, 页码：5-8 , 文章类型： 研究论文，,卷期：2009年11-1] The C14,15-Dihydro-C22,25-epi north unit I of cephalostatin 1 has been synthesized in 11 operations from com. available hecogenin acetate via multiple redns. and oxidns. The key transformations include (i) CrVI-catalyze... Efficient Construction of Oligocholate Foldamers via "Click" Chemistry and Their Tolerance of Structural Heterogeneity. [作者：Pan, Xingang;Zhao, Yan;,期刊：Organic Letters, 页码：69-72 , 文章类型： 研究论文，,卷期：2009年11-1] The 1,3-dipolar cycloaddn. between an alkynyl-terminated cholate trimer and an azido-functionalized cholate hexamer readily afforded the nonamer and dodecamer derivs., whereas amide coupling employed in previous oligocho... First Total Synthesis of Hinckdentine A. [作者：Higuchi, Kazuhiro;Sato, Yukihiro;Tsuchimochi, Mei;Sugiura, Kenta;Hatori, Masatoshi;Kawasaki, Tomomi;,期刊：Organic Letters, 页码：197-199 , 文章类型： 研究论文，,卷期：2009年11-1] acid-mediated Mannich-type C-C bond formation of 2-hydroxyindolin-3-one, seven-membered ring closure, and regioselective tribromination. Concise Total Synthesis of (?-cis-Trikentrin A and (?-Herbindole A via Intermolecular Indole Aryne Cycloaddition. [作者：Buszek, Keith R.;Brown, Neil;Luo, Diheng;,期刊：Organic Letters, 页码：201-204 , 文章类型： 研究论文，,卷期：2009年11-1] An efficient nine-step total synthesis of the annulated indole natural products (?-cis-trikentrin A (I, R1 = Et, R2 = H) and (?-herbindole A (I, R1 = R2 = Me) was accomplished via an intermol. Diels-Alder cycloaddn. usin... Hiyama Cross-Coupling Reaction in the Stereospecific Synthesis of Retinoids. [作者：Montenegro, Javier;Bergueiro, Julian;Saa, Carlos;Lopez, Susana;,期刊：Organic Letters, 页码：141-144 , 文章类型： 研究论文，,卷期：2009年11-1] The first application of the Hiyama reaction to the synthesis of retinoids is reported. A range of organosilicon moieties (siloxanes, silanols and three kinds of "safety-catch" silanols) were successfully coupled, under... Convergent Formal Syntheses of (?-Brussonol and (?-Abrotanone via an Intramolecular Marson-Type Cyclization. [作者：Martinez-Solorio, Dionicio;Jennings, Michael P.;,期刊：Organic Letters, 页码：189-192 , 文章类型： 研究论文，,卷期：2009年11-1] The formal convergent syntheses of both (?-brussonol and (?-abrotanone are reported by the prepn. of the intermedium I. The key step involved the diastereoselective capture of an in situ generated oxocarbenium cation vi... Conjugated Macrocycles Related to the Porphyrins. Part 49. [作者：adj-Diazuliporphyrins, a New Family of Dicarbaporphyrinoids with Unprecedented Mesoionic Characteristics. Zhang, Zhenjun;Ferrence, Gregory M.;Lash, Timothy D.;,期刊：Organic Letters, 页码：101-104 , 文章类型： 研究论文，,卷期：2009年11-1] Diazulenylmethane dialdehyde I reacted with dipyrrylmethane dicarboxylic acid II (R = Et, CH2CH2CO2Me) in the presence of HCl or HBr, followed by oxidn. with FeCl3, to give arom. adj-diazuliporphyrin III (R = Et, CH2CH2C... A Novel Three-Component Reaction toward Dihydrooxazolopyridines. [作者：Scheffelaar, Rachel;Paravidino, Monica;Muilwijk, Daan;Lutz, Martin;Spek, Anthony L.;de Kanter, Frans J. J.;Orru, Romano V. A.;Ruijter, Eelco;,期刊：Organic Letters, 页码：125-128 , 文章类型： 研究论文，,卷期：2009年11-1] Isocyano dihydropyridones accessible via a recently reported multicomponent reaction react with aldehydes and amines to afford dihydrooxazolopyridines in high yield. The scope and limitations of this novel multicomponen... Hydrogen-Bonded DeUG譊AN Heterocomplex: Structure and Stability and a Scalable Synthesis of DeUG with Reactive Functionality. [作者：Kuykendall, Darrell W.;Anderson, Cyrus A.;Zimmerman, Steven C.;,期刊：Organic Letters, 页码：61-64 , 文章类型： 研究论文，,卷期：2009年11-1] A convenient, scalable synthesis of the supramol. building block 7-deazaguanine-based urea (DeUG) is reported. Incorporation of reactive moieties (DeUG azide 10 and alkyne 11 for copper-catalyzed azide-alkyne cycloaddns... Mechanism of the [(NHC)AuI]-Catalyzed Rearrangement of Allylic Acetates. A DFT Study. [作者：Gourlaouen, Christophe;Marion, Nicolas;Nolan, Steven P.;Maseras, Feliu;,期刊：Organic Letters, 页码：81-84 , 文章类型： 研究论文，,卷期：2009年11-1] The DFT study of the mechanism of the rearrangement of H2C=CHC(CH3)OCOCH3 to (CH3)(H)C=CHCH2OCOCH3 catalyzed by [(NHC)Au]+ (NHC = N-heterocyclic carbene) shows that a low energy path exists, with a barrier of 14.2 kcal/m... Remarkable Effects of Chirality on Deslipping Reactions of Diastereomeric Rotaxanes and Relevant Mechanism Involving Pre-Equilibrium. [作者：Hirose, Keiji;Nakamura, Yamato;Tobe, Yoshito;,期刊：Organic Letters, 页码：145-147 , 文章类型： 研究论文，,卷期：2009年11-1] The first clear differentiation on deslipping rates affected by the difference in the diastereomeric stereocenters of rotaxanes up to 8.4 times and unexpectedly large steric kinetic isotope effect on the deslipping react...