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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80条记录   Carbon-Sulfur Bond Formation via Iridium-Catalyzed Asymmetric Allylation of Aliphatic Thiols [作者：GAO NING; ZHENG SHENGCAI; YANG WEIKANG; ZHAO XIAOMING,期刊：Organic Letters, 页码：1514-1516 , 文章类型： Article，,卷期：2011年13-6] An iridium-catalyzed regio- and enatioselective allylation with aliphatic thiols as the nucleophile in dichloromethane has been accomplished; and the branch products were obtained in 34-80% yields with up to 94/6 b/l and... Hydroxyl-Directed Cyclizations of 1,6-Enynes [作者：CAMELIO ANDREW M; BARTON THOMAS; GUO FENGHAI; SHAW TRAVIS; SIEGEL DIONICIO,期刊：Organic Letters, 页码：1517-1519 , 文章类型： Article，,卷期：2011年13-6] The palladium-catalyzed, hydroxyl-directed cyclization reactions of 1,6-enynes provide a highly diastereoselective process for the syntheses of stereochemically defined cyclopentanes. Consistently high levels of cis-sele... Synthesis of a Pentalene Centered Polycyclic Fused System [作者：YIN XIAODONG; LI YONGJUN; ZHU YULAN; KAN YUHE; LI YULIANG; ZHU DAOBEN,期刊：Organic Letters, 页码：1520-1523 , 文章类型： Article，,卷期：2011年13-6] A novel pentalene-centered polycyclic 24 pi-electron system, IB1, was synthesized via a Pd-catalyzed homocoupling reaction. The geometry structure was studied by X-ray diffraction and theoretical method. The HOMO level o... Highly Enantioselective and Regioselective Copper-Catalyzed 1,4 Addition of Grignard Reagents to Cyclic Enynones [作者：TISSOT MATTHIEU; HERNANDEZ ALEXANDRA PEREZ; MUELLER DANIEL; MAUDUIT MARC; ALEXAKIS ALEXANDRE,期刊：Organic Letters, 页码：1524-1527 , 文章类型： Article，,卷期：2011年13-6] In this letter we describe an unusual result in terms of regioselectivity with respect to copper-catalyzed conjugate additions of various Grignard reagents to cyclic enynones. The use of Cu(OTf)(2) and NHC ligand L1 as t... The Formal [4+3] Cycloaddition between Donor-Acceptor Cyclobutanes and Nitrones [作者：STEVENS ANDREW C; PALMER CORY; PAGENKOPF BRIAN L,期刊：Organic Letters, 页码：1528-1531 , 文章类型： Article，,卷期：2011年13-6] The formal [4+3] cycloaddition of 2-alkoxy-1,1-dicarboxylate activated donor -acceptor cyclobutanes with nitrones Is disclosed. The reaction forms structurally unique oxazepines in moderate to high yield with a wide scop... A New Class of Urea-Substituted Cinchona Alkaloids Promote Highly Enantioselective Nitroaldol reactions of Trifluoromethylketones [作者：PALACIO CAROLE; CONNON STEPHEN J,期刊：Organic Letters, 页码：1298-1301 , 文章类型： Article，,卷期：2011年13-6] The first class of bifunctional cinchona-alkaloid catalysts incorporating a urea moiety at C-5' has been developed. These materials catalyze the efficient and highly enantioselective 1,2-addition of nitromethane to trifl... Fluoroallylboration-Olefination for the Synthesis of (Z)-4,4-Difluoropent-2-enoates and 5,5-Difluoro-5,6-dihydropyran-2-ones [作者：RAMACHANDRAN P VEERARAGHAVAN; TAFELSKAKACZMAREK AGNIESZKA; SAKAVUYI KAUMBA; CHATTERJEE ANAMITRA,期刊：Organic Letters, 页码：1302-1305 , 文章类型： Article，,卷期：2011年13-6] Horner-Wadsworth Emmons (HWE) or Still-Gennari olefination of TBS-protected 3,3-difluoro-4-hydroxy-2-ones, derived from the difluoroallylboration of aldehydes, provides the Z-isomer of 4,4,-difluoropent-2-enoates. These,... Highly Diastereo- and Enantioselective Aldol Reaction of Methyl alpha-Isocyanoacetate: A Cooperative Catalysis Approach [作者：KIM HUN YOUNG; OH KYUNGSOO,期刊：Organic Letters, 页码：1306-1309 , 文章类型： Article，,卷期：2011年13-6] The cooperative catalyst activity between a chiral transition-metal catalyst and an achiral organocatalyst has been identified as one of the critical asymmetric reaction optimization components in the highly diastereo- a... L-Threonine-Derived Novel Bifunctional Phosphine-Sulfonamide Catalyst-Promoted Enantioselective Aza-Morita-Baylis-Hillman Reaction [作者：ZHONG FANGRUI; WANG YOUQING; HAN XIAOYU; HUANG KUOWEI; LU YIXIN,期刊：Organic Letters, 页码：1310-1313 , 文章类型： Article，,卷期：2011年13-6] A series of novel bifunctional phosphine sulfonamide organic catalysts were designed and readily prepared from natural amino acids, and they were utilized to promote enantioselective aza-Morita-Baylis-Hillman (MBH) react... Unique X-ray Sheet Structure of 1,8-Bis(imidazolium) Anthracene and Its Application as a Fluorescent Probe for DNA and DNase [作者：KIM HA NA; LIM JISOO; LEE HAN NA; RYU JUWOO; KIM MIN JUNG; LEE JOOHEE; LEE DONGUNG; KIM YOUNGMEE; KIM SUNGJIN; LEE KAP DUK; LEE HEESEUNG; YOON JUYOUNG,期刊：Organic Letters, 页码：1314-1317 , 文章类型： Article，,卷期：2011年13-6] A new imidazolium anthracene derivative 1 was synthesized, and its unique X-ray crystal structure was examined. In aqueous solutions, probe 1 exhibited a selective fluorescent quenching effect only with DNA among various... Iterative Stereospecific Reagent-Controlled Homologation Using a Functionalized alpha-Chloroalkyllithium: Synthesis of Cyclic Targets Related to Epibatidine [作者：EMERSON CHRISTOPHER R; ZAKHAROV LEV N; BLAKEMORE PAUL R,期刊：Organic Letters, 页码：1318-1321 , 文章类型： Article，,卷期：2011年13-6] Enantioenriched 1-chloro-2-(1,3-dioxolan-2-yl)ethyllithium was generated by PhLi initiated sulfoxide-ligand exchange and deployed in situ for sequential double stereospecific reagent-controlled homologation (StReCH) of B... Solomonamides A and B, New Anti-inflammatory Peptides from Theonella swinhoei [作者：FESTA CARMEN; DE MARINO SIMONA; SEPE VALENTINA; DAURIA MARIA VALERIA; BIFULCO GIUSEPPE; DEBITUS CECILE; BUCCI MARIAROSARIA; VELLECCO VALENTINA; ZAMPELLA ANGELA,期刊：Organic Letters, 页码：1532-1535 , 文章类型： Article，,卷期：2011年13-6] Two unprecedented cyclic peptides, solomonamides A and B, were Isolated from the marine sponge Theonella swinhoel. The structures were elucidated on the basis of comprehensive 1D and 2D NMR analysis and high-resolution m... Acyldepsipeptide HDAC Inhibitor Production Induced in Burkholderia thailandensis [作者：BIGGINS JOHN B; GLEBER CONRAD D; BRADY SEAN F,期刊：Organic Letters, 页码：1536-1539 , 文章类型： Article，,卷期：2011年13-6] Natural product gene clusters are often tightly regulated, resulting in gene cluster silencing in laboratory fermentation studies. The systematic overexpression of transcription factors (TFs) associated with biosynthetic... Highly Enantioselective Direct Vinylogous Michael Addition of gamma-Butenolide to Enals [作者：QUINTARD ADRIEN; LEFRANC ALICE; ALEXAKIS ALEXANDRE,期刊：Organic Letters, 页码：1540-1543 , 文章类型： Article，,卷期：2011年13-6] An unprecedented and simple direct vinylogous addition of deconjugated butenolide to enals has been developed in excellent stereoselectivities (> 95% ee), with Aminal-PYrrolidine (APY) catalyst. This methodology allows f... Glycosyl Sulfonium Ions as Storable Intermediates for Glycosylations [作者：NOKAMI TOSHIKI; NOZAKI YUKI; SAIGUSA YOSHIHIRO; SHIBUYA AKITO; MANABE SHINO; ITO YUKISHIGE; YOSHIDA JUNICHI,期刊：Organic Letters, 页码：1544-1547 , 文章类型： Article，,卷期：2011年13-6] Glycosyl sulfonium ions, which serve as persistent glycosyl cation equivalents, were prepared by the addition of diorganosulfides to an electrochemically generated glycosyl triflate. Low-temperature and variable-temperat... An Acid-Catalyzed Formal Allylic C-H Oxidation of Aryl Cycloalkenes with N-Propylthiosuccinimide [作者：HUANG DESHUN; WANG HAINING; GUAN HUAN; HUANG HU; SHI YIAN,期刊：Organic Letters, 页码：1548-1551 , 文章类型： Article，,卷期：2011年13-6] A mild acid-catalyzed formal allylic C-H oxidation of aryl cycloalkenes with N-propylthlosuccinimide in the presence of various nucleophiles to generate allylic ethers, esters, and sulfonamides is described. A possible r...