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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53条记录   Catalyzed Cyclizations Leading to Enrichment of Functionality and Chirality. A General Approach to Dibenzocyclooctadiene Lignans from a,w-Diynes. [作者：Singidi, Ramakrishna Reddy;RajanBabu, T. V.;,期刊：Organic Letters, 页码：3351-3354 , 文章类型： 研究论文，,卷期：2008年10-15] The [B-Sn]-mediated cyclization of a,w-diynes results in not only an increase in the functionalizable groups (incorporated as highly versatile vinyl-B and vinyl-Sn groups) but also an increase in new serviceable stereoch... Studies toward Frondosin A and Its Analogues. Formal Total Synthesis of (?-Frondosin A. [作者：Li, Xin;Keon, Alec E.;Sullivan, Jonathan A.;Ovaska, Timo V.;,期刊：Organic Letters, 页码：3287-3290 , 文章类型： 研究论文，,卷期：2008年10-15] Two reaction sequences commencing with different starting materials were successfully employed for the synthesis of frondosin A analogs, including (?-frondosin A di-Me ether. Construction of the bicyclo[5.4.0]undecane c... Direct Catalytic Asymmetric Mannich-Type Reaction of b-Keto Phosphonate Using a Dinuclear Ni2-Schiff Base Complex. [作者：Chen, Zhihua;Yakura, Kenichiro;Matsunaga, Shigeki;Shibasaki, Masakatsu;,期刊：Organic Letters, 页码：3239-3242 , 文章类型： 研究论文，,卷期：2008年10-15] Direct catalytic asym. Mannich-type reactions of b-keto phosphonates are described. A homodinuclear Ni2-Schiff base complex promoted the reaction at 0? giving b-amino phosphonates in up to 90% yield, 20:1 dr, and 99% ee... Synthesis of 3-Selena-1-dethiacephems and Selenazepines via Iodocyclization. [作者：Garud, Dinesh R.;Koketsu, Mamoru;,期刊：Organic Letters, 页码：3319-3322 , 文章类型： 研究论文，,卷期：2008年10-15] A convenient approach to synthesize novel selenium-b-lactams, e.g. I (R = Ph, 4-ClC6H4, 2-naphthyl, etc., R1 = CH2CYCH, CH:C:CH2), 3-selena-1-dethiacephems, e.g. II and III, and selenazepines, e.g. IV (R = Me, Et, 1-pent... Preparation of Aryloxetanes and Arylazetidines by Use of an Alkyl-Aryl Suzuki Coupling. [作者：Duncton, Matthew A. J.;Estiarte, M. Angels;Tan, Darlene;Kaub, Carl;O'Mahony, Donogh J. R.;Johnson, Russell J.;Cox, Matthew;Edwards, William T.;Wan, Min;Kincaid, John;Kelly, Michael G.;,期刊：Organic Letters, 页码：3259-3262 , 文章类型： 研究论文，,卷期：2008年10-15] The oxetan-3-yl and azetidin-3-yl substituents have previously been identified as privileged motifs within medicinal chem. An efficient approach to installing these two modules into arom. systems, using a nickel-mediate... Chuktabrins A and B, Two Novel Limonoids from the Twigs and Leaves of Chukrasia tabularis. [作者：Zhang, Chuan-Rui;Fan, Cheng-Qi;Zhang, Li;Yang, Sheng-Ping;Wu, Yan;Lu, Yang;Yue, Jian-Min;,期刊：Organic Letters, 页码：3183-3186 , 文章类型： 研究论文，,卷期：2008年10-15] Two novel limonoids, chuktabrin A (1,I), featuring the unique motifs of a 1,3-dioxolan-2-one and a 3,4-dihydro-2H-pyran, and chuktabrin B (2), possessing an unprecedented polycyclic skeleton, were isolated from Chukrasia... Synthesis and photophysical investigation of squaraine rotaxanes by "Clicked Capping". [作者：Gassensmith, Jeremiah J.;Barr, Lorna;Baumes, Jeffrey M.;Paek, Agelina;Nguyen, Anh;Smith, Bradley D.;,期刊：Organic Letters, 页码：3343-3346 , 文章类型： 研究论文，,卷期：2008年10-15] Photochemistry, and Photographic and Other Reprographic Pseudorotaxane complexes of squaraine dyes and tetralactam macrocycles are converted into permanently interlocked rotaxane structures (I and II, I and III resp. int... Solid-support based total synthesis and stereochemical correction of brunsvicamide A. [作者：Walther, Thilo;Arndt, Hans-Dieter;Waldmann, Herbert;,期刊：Organic Letters, 页码：3199-3202 , 文章类型： 研究论文，,卷期：2008年10-15] A total synthesis of the cyanobacterial metabolite brunsvicamide A and the correction of its originally assigned stereochem. are reported. Key elements were the construction of a urea building block, peptide elongation ... Dynamic Combinatorial Libraries Constructed on Polymer Scaffolds. [作者：Fulton, David A.;,期刊：Organic Letters, 页码：3291-3294 , 文章类型： 研究论文，,卷期：2008年10-15] Functionalized polymers were prepd. by grafting acylhydrazides onto a poly(p-vinylbenzaldehyde) scaffold through reversible hydrazone linkages. The dynamic nature of these linkages allows the functionalized polymers to ... Kinetic Resolution of Racemic Carboxylic Acids by an L-Histidine-Derived Sulfonamide-Induced Enantioselective Esterification Reaction. [作者：Ishihara, Kazuaki;Kosugi, Yuji;Umemura, Shuhei;Sakakura, Akira;,期刊：Organic Letters, 页码：3191-3194 , 文章类型： 研究论文，,卷期：2008年10-15] The direct and catalytic kinetic resoln. of racemic carboxylic acids bearing a Bronsted base such as O-protected a-hydroxy carboxylic acids R1OCHR2CO2H (R1 = pyrrolidin-1-ylcarbonyl; R2 = Me2CH, Ph, PhCH2, Me3CSiPh2) and... Stereoselective Synthesis of Acyclic Amino Alcohols via von Braun Ring Opening of Chiral Piperidines. [作者：McCall, W. Stephen;Abad Grillo, Teresa;Comins, Daniel L.;,期刊：Organic Letters, 页码：3255-3257 , 文章类型： 研究论文，,卷期：2008年10-15] Multisubstituted piperidines contg. a Ph group at C-2 can be opened regio- and stereoselectively with cyanogen bromide. The ring-opened products contain useful cyanamide and benzylic bromide functional groups. This met... Ultrafast Reversible Photo-Cross-Linking Reaction: Toward in Situ DNA Manipulation. [作者：Yoshimura, Yoshinaga;Fujimoto, Kenzo;,期刊：Organic Letters, 页码：3227-3230 , 文章类型： 研究论文，,卷期：2008年10-15] photo-crosslinking reaction via 3-cyanovinylcarbazole nucleoside (CNVK). Oligodeoxynucleotide (ODN) contg. CNVK can be photo-crosslinked by irradn. at 366 nm for 1 s, and the photo-crosslinked ODN can be split by irradn... Arylation of Phe and Tyr Side Chains of Unprotected Peptides by a Suzuki-Miyaura Reaction in Water. [作者：Vilaro, Maria;Arsequell, Gemma;Valencia, Gregorio;Ballesteros, Alfredo;Barluenga, Jose;,期刊：Organic Letters, 页码：3243-3245 , 文章类型： 研究论文，,卷期：2008年10-15] An efficient arylation in water of tyrosine and phenylalanine side chains from unprotected iodopeptides is accomplished by using Suzuki-Miyaura cross-coupling processes. The method is compatible with the hydrophilic and... A Regio- and Stereocontrolled Approach to Pyranosyl C-Nucleoside Synthesis. [作者：Redpath, Philip;Macdonald, Simon;Migaud, Marie E.;,期刊：Organic Letters, 页码：3323-3326 , 文章类型： 研究论文，,卷期：2008年10-15] synthesized from nonchiral starting materials, using the ene/intramol. Sakurai cyclization reaction demonstrating a simple, general, and stereocontrolled approach to pyranosyl C-nucleosides. Highly Enantioselective [4 + 2] Cycloaddition Reactions Catalyzed by a Chiral N-Methyl-oxazaborolidinium Cation. [作者：Canales, Eda;Corey, E. J.;,期刊：Organic Letters, 页码：3271-3273 , 文章类型： 研究论文，,卷期：2008年10-15] provides a new route for the synthesis of oxazaborolidines. This method also leads to the first synthesis of hitherto elusive N-Me oxazaborolidine cations, specifically the cationic proline deriv. I. Compd. I is a stron... Synthetic Studies on (+)-Manzamine A: Stereoselective Synthesis of the Tetracyclic Core Framework. [作者：Kita, Yoichi;Toma, Tatsuya;Kan, Toshiyuki;Fukuyama, Tohru;,期刊：Organic Letters, 页码：3251-3253 , 文章类型： 研究论文，,卷期：2008年10-15] The stereoselective synthesis of the tetracyclic intermediate I for (+)-manzamine A has been achieved. The key features of this stereoselective synthesis of I are the Rh-catalyzed asym. hydrogenation and a diastereosele...