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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105条记录   Atroposelective Heck Macrocyclization: Enantioselective Synthesis of Bis(bibenzylic) Natural Products [作者：GROH MATTHIAS; MEIDLINGER DANIEL; BRINGMANN GERHARD; SPEICHER ANDREAS,期刊：Organic Letters, 页码：4548-4551 , 文章类型： Article，,卷期：2012年14-17] The Heck protocol was applied for the first time to the atroposelective synthesis of macrocyclic natural products. As ring closure to bis(bibenzyls) of the isoplagiochin type leads to a configurationally stable biaryl ax... N-Amino-imidazolin-2-one Peptide Mimic Synthesis and Conformational Analysis [作者：PROULX CAROLINE; LUBELL WILLIAM D,期刊：Organic Letters, 页码：4552-4555 , 文章类型： Article，,卷期：2012年14-17] Base-promoted 5-exo-dig cyclizations of aza-propargylglycinamides provided N-amino-imidazolin-2-one peptide mimics, which exhibited turn geometry in X-ray crystallographic and NMR spectroscopic analyses. Sonogashira coup... Interrupted Fischer Indolization Approach toward the Communesin Alkaloids and Perophoramidine [作者：SCHAMMEL ALEX W; CHIOU GRACE; GARG NEIL K,期刊：Organic Letters, 页码：4556-4559 , 文章类型： Article，,卷期：2012年14-17] A concise approach toward the total synthesis of the communesin alkaloids and perophoramidine is reported. The strategy relies on the use of the interrupted Fischer indolization to build the tetracyclic indoline core of ... Transition-Metal-Free Borylation of Aryltriazene Mediated by BF3 center dot OEt2 [作者：ZHU CHUAN; YAMANE MOTOKI,期刊：Organic Letters, 页码：4560-4563 , 文章类型： Article，,卷期：2012年14-17] A practical and simple method for deaminoborylation of aryltriazene with bis(pinacolato)diboron has been developed that is mediated by BF3 center dot OEt2. Various arylboronic esters are prepared in moderate to good yiel... Mechanism of the Regio- and Diastereoselective Ring Expansion Reaction Using Trimethylsilyldiazomethane [作者：SAKAI TAKEO; ITO SATOSHI; FURUTA HIROKI; KAWAHARA YUKI; MORI YUJI,期刊：Organic Letters, 页码：4564-4567 , 文章类型： Article，,卷期：2012年14-17] An equatorial attack of TMS-diazomethane was determined to be the first step of the BF3-promoted ring expansion reaction of six-membered ketones using TMS-diazomethane. The migration reaction occurred in a conformation i... Fischer Indole Synthesis in Low Melting Mixtures [作者：GORE SANGRAM; BASKARAN SUNDARABABU; KOENIG BURKHARD,期刊：Organic Letters, 页码：4568-4571 , 文章类型： Article，,卷期：2012年14-17] Functionalized indoles are synthezised under mild conditions in a tartaric acid-dimethylurea melt. The melt serves as the solvent and as the catalyst. Under these reaction conditions, sensitive functional groups such as ... Construction of Benzosiloles, Six- and Eight-Membered Silacyclic Skeletons, via a Pd-Catalyzed Intramolecular Mizoroki-Heck Reaction of Vinylsilanes [作者：OUYANG KUNBING; LIANG YUN; XI ZHENFENG,期刊：Organic Letters, 页码：4572-4575 , 文章类型： Article，,卷期：2012年14-17] A variety of silacycles including benzosiloles, six- and eight-membered silacyclic skeletons, were efficiently synthesized via a Pd-catalyzed intramolecular Mizoroki-Heck reaction of vinylsilanes. Argentivorous Molecules: Structural Evidence for Ag+-pi Interactions in Solution [作者：HABATA YOICHI; IKEDA MARI; YAMADA SACHIKO; TAKAHASHI HIROKI; UENO SUMIKO; SUZUKI TAKATOSHI; KUWAHARA SHUNSUKE,期刊：Organic Letters, 页码：4576-4579 , 文章类型： Article，,卷期：2012年14-17] Tetra-armed cyclens bearing aromatic side arms were prepared by the reductive amination of cyclen with substituted benzaldehydes. When equimolar amounts of Ag+ ions were added to the ligands, the aromatic rings covered t... Synthesis of Imidazopyridines from the Morita-Baylis-Hillman Acetates of Nitroalkenes and Convenient Access to Alpidem and Zolpidem [作者：NAIR DIVYA K; MOBIN SHAIKH M; NAMBOOTHIRI IRISHI N N,期刊：Organic Letters, 页码：4580-4583 , 文章类型： Article，,卷期：2012年14-17] A variety of functionalized imidazo[1,2-a]pyridines have been synthesized through a one-pot, room temperature, and reagent-free reaction between MBH acetates of nitroalkenes and 2-aminopyridines. The reaction involves a ... Mechanism of Cooperative Catalysis in a Lewis Acid Promoted Nickel-Catalyzed Dual C-H Activation Reaction [作者：ANAND MEGHA; SUNOJ RAGHAVAN B,期刊：Organic Letters, 页码：4584-4587 , 文章类型： Article，,卷期：2012年14-17] The mechanism of cooperativity offered by AlMe3 in a Ni-catalyzed dehydrogenative cycloaddition between substituted formamides and an alkyne is investigated by using DFT(SMDtoluence/M06/6-31G**) methods. The preferred pa... Enantioselective Construction of Pyrroloindolines via Chiral Phosphoric Acid Catalyzed Cascade Michael AdditionCyclization of Tryptamines [作者：CAI QUAN; LIU CHUAN; LIANG XIAOWEI; YOU SHULI,期刊：Organic Letters, 页码：4588-4590 , 文章类型： Article，,卷期：2012年14-17] Enantioselective construction of pyrroloindolines via chiral phosphoric acid catalyzed cascade Michael addition-cyclization of tryptamines has been realized. With 5 mol % of chiral phosphoric acid, enantioenriched pyrrol... A Unique Pathway for the 3-Aminobutyrate Starter Unit from L-Glutamate through beta-Glutamate during Biosynthesis of the 24-Membered Macrolactam Antibiotic, Incednine [作者：TAKAISHI MAKOTO; KUDO FUMITAKA; EGUCHI TADASHI,期刊：Organic Letters, 页码：4591-4593 , 文章类型： Article，,卷期：2012年14-17] Incednine is a 24-membered macrolactam antibiotic produced by Streptomyces sp. ML694-90F3. A previous study demonstrated that its unique nitrogen-containing starter unit was derived from L-glutamate. To elucidate the mis... Direct Carbo-Acylation Reactions of 2-Arylpyridines with alpha-Diketones via Pd-Catalyzed C-H Activation and Selective C(sp2)-C(sp2) Cleavage [作者：ZHOU WEI; LI HONGJI; WANG LEI,期刊：Organic Letters, 页码：4594-4597 , 文章类型： Article，,卷期：2012年14-17] An efficient carbo-acylation reaction of 2-arylpyridines with alpha-diketones via Pd-catalyzed C-H bond activation and C-C bond cleavage in the presence of TBHP was developed that generated aryl ketones in good yields. T... An Efficient Synthesis of Pyrrolo[2,3,4-kl]acridin-1-one Derivatives Catalyzed by L-Proline [作者：WANG HUIYUAN; LI LILI; LIN WEI; XU PAN; HUANG ZHIBIN; SHI DAQING,期刊：Organic Letters, 页码：4598-4601 , 文章类型： Article，,卷期：2012年14-17] An efficient domino approach for the synthesis of novel pyrrolo[2,3,4-kl]acridin-1-one derivatives has been established. This reaction represents the first facile conversion of an isatin to a pyrrolo[2,3,4-kl]acridin-1-o... Synthesis of Tri-O-acetyl-D-allal from Levoglucosenone [作者：GIORDANO ENRIQUE D V; FRINCHABOY AGUSTINA; SUAREZ ALEJANDRA G; SPANEVELLO ROLANDO A,期刊：Organic Letters, 页码：4602-4605 , 文章类型： Article，,卷期：2012年14-17] Tri-O-acetyl-o-allal has been enantiospecifically synthesized in six steps from levoglucosenone in 55% overall yield. A key step in the synthesis is the anhydro bridge ring-opening with concomitant formation of a 1,3-oxa... A General Method for Suzuki-Miyaura Coupling Reactions Using Lithium Triisopropyl Borates [作者：OBERLI MATTHIAS A; BUCHWALD STEPHEN L,期刊：Organic Letters, 页码：4606-4609 , 文章类型： Article，,卷期：2012年14-17] Conditions for the Suzuki-Miyaura coupling of lithium triisopropyl borates are reported, as well as a procedure for a one-pot lithiation, borylation, and subsequent Suzuki-Miyaura coupling of various heterocycles with ar...