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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69条记录   2-Arylhydroxytyrosol Derivatives via Suzuki-Miyaura Cross-Coupling. [作者：Bernini, Roberta;Cacchi, Sandro;Fabrizi, Giancarlo;Filisti, Eleonora;,期刊：Organic Letters, 页码：3457-3460 , 文章类型： 研究论文，,卷期：2008年10-16] 2-Arylhydroxytyrosol derivs., a new class of hydroxytyrosol derivs., have been prepd. in high to excellent yields from the corresponding 2-chloro precursors via Suzuki-Miyaura cross-coupling with arylboronic acids contg.... A Highly Stereoselective Synthesis of Chiral a-Amino-b-lactams via the Kinugasa Reaction Employing Ynamides. [作者：Zhang, Xuejun;Hsung, Richard P.;Li, Hongyan;Zhang, Yu;Johnson, Whitney L.;Figueroa, Ruth;,期刊：Organic Letters, 页码：3477-3479 , 文章类型： 研究论文，,卷期：2008年10-16] A highly stereoselective synthesis of chiral a-amino-b-lactams through an ynamide-Kinugasa reaction is described. For example, reacting ynamide I with N-phenyl-a-phenylnitrone gave b-lactam II in 80% yield favoring the ... Highly Direct a-Selective Glycosylations of 3,4-O-Carbonate-Protected 2-Deoxy- and 2,6-Dideoxythioglycosides by Preactivation Protocol. [作者：Lu, Yin-Suo;Li, Qin;Zhang, Li-He;Ye, Xin-Shan;,期刊：Organic Letters, 页码：3445-3448 , 文章类型： 研究论文，,卷期：2008年10-16] A new efficient pre-activation method for the highly a-stereoselective glycosylation of 2-deoxysugars and 2,6-dideoxysugars has been developed using 2-deoxy- and 2,6-dideoxythioglycosides as glycosyl donors. The approac... A Concise Synthesis of the Pentacyclic Framework of Cortistatins. [作者：Yamashita, Shuji;Iso, Kentaro;Hirama, Masahiro;,期刊：Organic Letters, 页码：3413-3415 , 文章类型： 研究论文，,卷期：2008年10-16] An efficient synthesis of the pentacyclic framework I of cortistatins has been developed. The key strategy comprises assembly of the A- and the CD-ring fragments by Knoevenagel reaction, facile formation of the pyran ri... Gold-Catalyzed Cycloisomerization of N-Propargylindole-2-carboxamides: Application toward the Synthesis of Lavendamycin Analogues. [作者：England, Dylan B.;Padwa, Albert;,期刊：Organic Letters, 页码：3631-3634 , 文章类型： 研究论文，,卷期：2008年10-16] A series of N-propargylindole-2-carboxamides were found to undergo a AuCl3-catalyzed cycloisomerization to give b-carbolinones in high yield. The corresponding b-chlorocarboline deriv. was prepd. and used for Pd(0)-cata... Expedient synthesis of pyrrolo[1,2-a]indoles: preparation of the core of yuremamine. [作者：Johansen, Michael B.;Kerr, Michael A.;,期刊：Organic Letters, 页码：3497-3500 , 文章类型： 研究论文，,卷期：2008年10-16] tetrahydro-1,2-oxazines, which in turn are generated through the reaction of nitrones with 1,1-cyclopropanediesters. The synthetic route proves to be highly diastereoselective and provides access to the core I of the re... Structure Revision and Synthesis of a Novel Labdane Diterpenoid from Zingiber ottensii. [作者：Boukouvalas, John;Wang, Jian-Xin;,期刊：Organic Letters, 页码：3397-3399 , 文章类型： 研究论文，,卷期：2008年10-16] The structure of ottensinin (I), a recently reported constituent of the medicinal plant Zingiber ottensii, was revised by re-evaluation of available NMR data from a a-ylidenebutenolide to a g-pyrone, whose rearranged lab... Convergent and Rapid Assembly of Substituted 2-Pyridones through Formation of N-Alkenyl Alkynylamides Followed by Gold-Catalyzed Cycloisomerization. [作者：Imase, Hidetomo;Noguchi, Keiichi;Hirano, Masao;Tanaka, Ken;,期刊：Organic Letters, 页码：3563-3566 , 文章类型： 研究论文，,卷期：2008年10-16] A new method for the convergent and rapid assembly of substituted 2-pyridones was developed through the formation of N-alkenyl alkynylamides (amide-linked 1,5-enynes) by N-acylation of imines with alkynoyl chlorides and ... Catalytic Enantioselective Intermolecular Cycloaddition of 2-Diazo-3,6-diketoester-Derived Carbonyl Ylides with Alkynes and Styrenes Using Chiral Dirhodium(II) Carboxylates. [作者：Shimada, Naoyuki;Anada, Masahiro;Nakamura, Seiichi;Nambu, Hisanori;Tsutsui, Hideyuki;Hashimoto, Shunichi;,期刊：Organic Letters, 页码：3603-3606 , 文章类型： 研究论文，,卷期：2008年10-16] Dirhodium(II) tetrakis[N-tetrachlorophthaloyl-(S)-tert-leucinate], Rh2(S-TCPTTL)4, is an exceptionally effective catalyst for enantioselective tandem carbonyl ylide formation-cycloaddn. reactions of 2-diazo-3,6-diketoest... New MCR-Heck-Isomerization Cascade toward Indoles. [作者：El Kaim, Laurent;Gizzi, Marion;Grimaud, Laurence;,期刊：Organic Letters, 页码：3417-3419 , 文章类型： 研究论文，,卷期：2008年10-16] The use of ortho-iodonitrophenol in Ugi-Smiles reaction to afford adducts such as I, coupled with Heck cyclization gives new access to indole scaffolds, e.g., II. The sequence can be performed in a one-pot reaction if t... 2,6-Diazaspiro[3.3]heptanes: Synthesis and Application in Pd-Catalyzed Aryl Amination Reactions. [作者：Burkhard, Johannes;Carreira, Erick M.;,期刊：Organic Letters, 页码：3525-3526 , 文章类型： 研究论文，,卷期：2008年10-16] A concise and scalable synthesis of a 2,6-diazaspiro[3.3]heptane building block is reported. The usefulness of this structural surrogate of piperazine is shown in arene amination reactions yielding a variety of N-Boc-N'... Diastereodivergent Aldol Reactions of b-Alkoxy Ethyl Ketones: Modular Access to (1,4)-syn and -anti Polypropionates. [作者：Arikan, Fatih;Li, Jun;Menche, Dirk;,期刊：Organic Letters, 页码：3521-3524 , 文章类型： 研究论文，,卷期：2008年10-16] Asym. substrate-controlled aldol reactions of Et ketones of type I with aldehyde II are reported. Modular access to all possible syn- and anti-aldol products was obtained by careful choice of reaction conditions. To ac... Efficient Synthesis of Sulfonyl Azides from Sulfonamides. [作者：Raushel, Jessica;Pitram, Suresh M.;Fokin, Valery V.;,期刊：Organic Letters, 页码：3385-3388 , 文章类型： 研究论文，,卷期：2008年10-16] Triflyl azide serves as an efficient diazo transfer reagent in this first direct synthesis of sulfonyl azides from readily available and stable sulfonamides. The process is exptl. simple, mild, and high-yielding. Sulfon... Organocatalytic Mannich-Type Reactions of Trifluoroethyl Thioesters. [作者：Utsumi, Naoto;Kitagaki, Shinji;Barbas, Carlos F., III;,期刊：Organic Letters, 页码：3405-3408 , 文章类型： 研究论文，,卷期：2008年10-16] Direct organocatalytic Mannich-type reactions of thioesters provide for the expedient and diastereoselective synthesis of protected b-amino acids. A variety of thioesters were found to be reactive with different imines ... A New Case of Induced Helical Chirality in a Bichromophoric System: Absolute Configuration of Transparent and Flexible Diols from the Analysis of the Electronic Circular Dichroism Spectra of the Corresponding Di(1-naphthyl)ketals. [作者：Tartaglia, Sabina;Pace, Francesca;Scafato, Patrizia;Rosini, Carlo;,期刊：Organic Letters, 页码：3421-3424 , 文章类型： 研究论文，,卷期：2008年10-16] Di(1-naphthyl)ketals of 1,n-diols show couplet effects allied to the 1B naphthalene transition in their CD spectra. This means that they assume a conformation with a prevailing sense of twist of the naphthalene rings, i... p-Dimer Formation as the Driving Force for Calix[4]arene-Based Molecular Actuators. [作者：Song, Changsik;Swager, Timothy M.;,期刊：Organic Letters, 页码：3575-3578 , 文章类型： 研究论文，,卷期：2008年10-16] Stable p-dimers are formed upon oxidn. of the model units of proposed calix[4]arene-based mol. actuators in a solvent of low dielec. const. (CH2Cl2) at room temp. Evidence from UV-vis, EPR, and DPV are all in agreement ...