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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97条记录   Mn(III)-Catalyzed Synthesis of Pyrroles from Vinyl Azides and 1,3-Dicarbonyl Compounds. [作者：Wang, Yi-Feng;Toh, Kah Kah;Chiba, Shunsuke;Narasaka, Koichi;,期刊：Organic Letters, 页码：5019-5022 , 文章类型： 研究论文，,卷期：2008年10-21] Polysubstituted N-H pyrroles with a wide variety of substituents were complexes as catalysts. Domino Transformation of D-Glucal to Racemic a-Substituted a-Hydroxymethyl Furfuryl Derivatives. [作者：Mukherjee, Debaraj;Yousuf, Syed Khalid;Taneja, Subhash Chandra;,期刊：Organic Letters, 页码：4831-4834 , 文章类型： 研究论文，,卷期：2008年10-21] Lewis acid mediated one-pot transformation of D-glucal (I) in the presence of nucleophiles leads to the formation of racemic a-substituted a-hydroxymethyl furfuryl derivs., e.g., II, versatile synthons for biol. active m... A Concise and Modular Synthesis of Pyranicin. [作者：Griggs, Nolan D.;Phillips, Andrew J.;,期刊：Organic Letters, 页码：4955-4957 , 文章类型： 研究论文，,卷期：2008年10-21] A modular, 13-step synthesis of the tetrahydropyran-contg. annonaceous acetogenin pyranicin (I) is reported. Key features are the use of an Achmatowicz oxidn.-Kishi redn. sequence for the assembly of a pyranone from a f... Synthesis of amphidinolide E C10-C26 fragment. [作者：Esteban, Jorge;Costa, Anna M.;Vilarrasa, Jaume;,期刊：Organic Letters, 页码：4843-4846 , 文章类型： 研究论文，,卷期：2008年10-21] The key C(10)-C(26) fragment (I) in a total synthesis of segment via Julia-Kocienski reaction with 4-bromo-2-methyl-4-pentenal, followed by a Sharpless asym. dihydroxylation to obtain the desired diol. The C(22)-C(26) f... Stereocontrolled Access to Isoprostanes via a Bicyclo[3.3.0]octene Framework. [作者：Oger, Camille;Brinkmann, Yasmin;Bouazzaoui, Samira;Durand, Thierry;Galano, Jean-Marie;,期刊：Organic Letters, 页码：5087-5090 , 文章类型： 研究论文，,卷期：2008年10-21] We report a simple and highly stereocontrolled strategy toward the total synthesis of isoprostanes I and II based on a bicyclic a,b-epoxy ketone intermediate III. Bicyclo[3.3.0]octene scaffold permitted stereodirection ... Synthesis and Electronic Properties of Conjugated Pentacene Dimers. [作者：Lehnherr, Dan;Gao, Jianbo;Hegmann, Frank A.;Tykwinski, Rik R.;,期刊：Organic Letters, 页码：4779-4782 , 文章类型： 研究论文，,卷期：2008年10-21] 76 Conjugated pentacene dimers 1-3 were synthesized in two steps from readily available precursors. Noteworthy is the initial step, which assembles five independent fragments to form the carbon-rich mol. framework. Sol... Palladium-Catalyzed Hiyama Cross-Coupling Reactions of Aryl Mesylates. [作者：Zhang, Liang;Qing, Jiang;Yang, Pengyuan;Wu, Jie;,期刊：Organic Letters, 页码：4971-4974 , 文章类型： 研究论文，,卷期：2008年10-21] 27 The combination of palladium acetate with XPhos shows high efficiency in the Hiyama cross-coupling reactions of aryl mesylates with arylsilanes. The reactions proceed smoothly to generate the corresponding biaryl com... First Cross-Coupling Reaction of Potassium Aryltrifluoroborates with Organic Chlorides in Aqueous Media Catalyzed by an Oxime-Derived Palladacycle. [作者：Alacid, Emilio;Najera, Carmen;,期刊：Organic Letters, 页码：5011-5014 , 文章类型： 研究论文，,卷期：2008年10-21] Potassium aryltrifluoroborates are cross-coupled with aryl and heteroaryl chlorides using a 4-hydroxyacetophenone oxime-derived palladacycle as precatalyst, K2CO3 as base, and TBAB as additive in refluxing water under co... Overcoming the Limitations of the Morita-Baylis-Hillman Reaction: A Rapid and General Synthesis of a-Alkenyl-b'-hydroxy Thioesters. [作者：Tarsis, Emily;Gromova, Anna;Lim, Daniel;Zhou, Guoqiang;Coltart, Don M.;,期刊：Organic Letters, 页码：4819-4822 , 文章类型： 研究论文，,卷期：2008年10-21] Acryloyl chlorides, aldehydes, and PhSLi undergo a direct aldol cascade sequence in the presence of MgBr2譕Et2 via in situ derived thioester enolates, which is followed by oxidative elimination to give a-alkenyl-b'-hydrox... Synthesis of Alkynyl Ethers and Low-Temperature Sigmatropic Rearrangement of Allyl and Benzyl Alkynyl Ethers. [作者：Sosa, Juan R.;Tudjarian, Armen A.;Minehan, Thomas G.;,期刊：Organic Letters, 页码：5091-5094 , 文章类型： 研究论文，,卷期：2008年10-21] a-Alkoxy ketones can be transformed into 1-alkynyl ethers by a two-step procedure involving formation of the enol triflate or phosphate and base-induced elimination. Performing the same reaction sequence with allylic al... Enyne Cross-Metathesis with Strained, Geminally-Substituted Alkenes: Direct Access to Highly Substituted 1,3-Dienes. [作者：Clark, Daniel A.;Basile, Brenda S.;Karnofel, William S.;Diver, Steven T.;,期刊：Organic Letters, 页码：4927-4929 , 文章类型： 研究论文，,卷期：2008年10-21] metathesis with 1-alkynes, giving 1,1,3-trisubstituted 1,3-dienes in good isolated yields. An extensive survey of Grubbs' second-generation catalysts led to an optimized reaction conducted at 0 癈. L-Selectride-Mediated Highly Diastereoselective Asymmetric Reductive Aldol Reaction: Access to an Important Subunit for Bioactive Molecules. [作者：Ghosh, Arun K.;Kass, Jorden;Anderson, David D.;Xu, Xiaoming;Marian, Christine;,期刊：Organic Letters, 页码：4811-4814 , 文章类型： 研究论文，,卷期：2008年10-21] L-Selectride redn. of a chiral or achiral enone followed by reaction of the resulting enolate with optically active a-alkoxy aldehydes proceeded with excellent diastereoselectivity. The resulting a,a-dimethyl-b-hydroxy ... Importance of Saccharomyces cerevisiae Oxidosqualene-Lanosterol Cyclase Tyrosine 707 Residue for Chair-Boat Bicyclic Ring Formation and Deprotonation Reactions. [作者：Wu, Tung-Kung;Wang, Tsai-Ting;Chang, Cheng-Hsiang;Liu, Yuan-Ting;Shie, Wen-Shiang;,期刊：Organic Letters, 页码：4959-4962 , 文章类型： 研究论文，,卷期：2008年10-21] A contact mapping strategy was applied to identify putative amino acid residues that influence the oxidosqualene-lanosterol B-ring cyclization reaction. A bicyclic intermediate with two altered deprotonation products, i... Synthesis and Characterization of Coumarin-Based Spiropyran Photochromic Colorants. [作者：Chen, Jhih-Rong;Wong, Jen-Bing;Kuo, Pei-Yu;Yang, Ding-Yah;,期刊：Organic Letters, 页码：4823-4826 , 文章类型： 研究论文，,卷期：2008年10-21] Two coumarin-based spiropyran derivs. were synthesized and characterized in two steps to explore their photochromic properties. Both prepd. compds. are sensitive to UV light and change colors upon irradn. The resulting ... B,O-Chelated azadipyrromethenes as near-IR probes. [作者：Loudet, Aurore;Bandichhor, Rakeshwar;Burgess, Kevin;Palma, Aniello;McDonnell, Shane O.;Hall, Michael J.;O'Shea, Donal F.;,期刊：Organic Letters, 页码：4771-4774 , 文章类型： 研究论文，,卷期：2008年10-21] Fluorescent Brighteners, and Photographic Sensitizers) Section Complementary synthetic routes to a new class of near-IR fluorophores are described. These allow facile access (four synthetic steps) to the core fluorophor... Syntheses of a- and b-C-glucopyranosyl serines from a common intermediate. [作者：Nolen, Ernest G.;Donahue, Laurence A.;Greaves, Rebecca;Daly, Trevor A.;Calabrese, David R.;,期刊：Organic Letters, 页码：4911-4914 , 文章类型： 研究论文，,卷期：2008年10-21] A versatile synthesis leading to either C-linked a- or b-glucopyranosyl serines is presented from a common, advanced synthetic intermediate, oxepenone (I) (Boc = tertbutoxycarbonyl). Oxepenone I is available through a R...