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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66条记录   Enantioselective Syntheses of syn- and anti-beta-Hydroxyallyisilanes Via Allene Hydroboration-Aldehyde Allylboration Reactions [作者：CHEN MING; ROUSH WILLIAM R,期刊：Organic Letters, 页码：1992-1995 , 文章类型： Article，,卷期：2011年13-8] The kinetic hydroboration of allenylsilane 5 with ((d)Ipc)(2)BH at -40 degrees C provides allylborane 9Z with >= 12:1 selectivity. When the hydroboration is performed at temperatures above -40 degrees C, 9Z isomerizes to... Cyclopropane-Aldehyde Annulations at Quaternary Donor Sites: Stereoselective Access to Highly Substituted Tetrahydrofurans [作者：SMITH AUSTIN G; SLADE MICHAEL C; JOHNSON JEFFREY S,期刊：Organic Letters, 页码：1996-1999 , 文章类型： Article，,卷期：2011年13-8] A diastereoselective synthesis of pentasubstituted tetrahydrofurans via a Lewis acid catalyzed (3 + 2)-annulation of quatemary donor site cyclopropanes and aldehydes is described. The reaction is catalyzed by Sn(OTf)(2),... Synthesis of the 5 '-Se-Thymidine Phosphoramidite and Convenient Labeling of DNA Oligonucleotide [作者：ZHANG WEN; HUANG ZHEN,期刊：Organic Letters, 页码：2000-2003 , 文章类型： Article，,卷期：2011年13-8] The synthesis of the 5'-Se-derivatized thymidine and phosphoramidite is reported, and the Se-phosphoramidite was incorporated into DNA. Because of its high nucleophilicity, this 5'-Se-moiety permits convenient postsynthe... An Enantioselective Synthesis of 2-Aryl Cycloalkanones by Sc-Catalyzed Carbon Insertion [作者：RENDINA VICTOR L; MOEBIUS DAVID C; KINGSBURY JASON S,期刊：Organic Letters, 页码：2004-2007 , 文章类型： Article，,卷期：2011年13-8] Current methods for asymmetric alpha-arylation require blocking groups to prevent reaction at the alpha'-carbon, basic conditions that promote racemization, or multistep synthesis. This work records the first catalytic e... Pd(II)-Catalyzed Ortho Arylation of 6-Arylpurines with Aryl Iodides via Purine-Directed C-H Activation: A New Strategy for Modification of 6-Arylpurine Derivatives [作者：GUO HAIMING; JIANG LILI; NIU HONGYING; RAO WEIHAO; LIANG LEI; MAO RUNZE; LI DEYANG; QU GUIRONG,期刊：Organic Letters, 页码：2008-2011 , 文章类型： Article，,卷期：2011年13-8] Purine is utilized as a new directing group for the Pd-catalyzed monoarylation of 6-arylpurines with simple aryl iodides via C H bond activation in good yields, providing a complementary tool for the modification of 6-ar... Iron(II) Triflate as a Catalyst for the Synthesis of Indoles by Intramolecular C-H Amination [作者：BONNAMOUR JULIEN; BOLM CARSTEN,期刊：Organic Letters, 页码：2012-2014 , 文章类型： Article，,卷期：2011年13-8] A practical iron-catalyzed intramolecular C-H amination reaction and its application in the synthesis of indole derivatives are presented. As a catalyst, commercially available iron(II) triflate is used. Asymmetric Total Synthesis of Clavolonine [作者：NAKAHARA KENJI; HIRANO KIE; MAEHATA RYOTA; KITA YASUYUKI; FUJIOKA HIROMICHI,期刊：Organic Letters, 页码：2015-2017 , 文章类型： Article，,卷期：2011年13-8] The asymmetric total synthesis of clavolonine (1) has been achieved based on chiral auxiliary multiple-use methodology. Our synthetic route features stereoselective transformations on the cyclohexane ring utilizing the s... Optical Control of Calcium Affinity in a Spiroamido-rhodamine Based Calcium Chelator [作者：WU LIANGXING; DAI YINGRUI; MARRIOTT GERARD,期刊：Organic Letters, 页码：2018-2021 , 文章类型： Article，,卷期：2011年13-8] An optically controlled Ca2+-chelator 1 was developed to mimic natural calcium oscillations. Compound 1, a spiroamido-rhodamine derivative of 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (BAPTA), underwent cy... Highly Enantioselective and Efficient Synthesis of Flavanones Including Pinostrobin through the Rhodium-Catalyzed Asymmetric 1,4-Addition [作者：KORENAGA TOSHINOBU; HAYASHI KEIGO; AKAKI YUSUKE; MAENISHI RYOTA; SAKAI TAKASHI,期刊：Organic Letters, 页码：2022-2025 , 文章类型： Article，,卷期：2011年13-8] An efficient synthesis of bioactive chiral flavanones (1) was achieved through the Rh-catalyzed asymmetric 1,4-addition of arylboronic acid to chromone. The reaction in toluene proceeded smoothly at room temperature in t... Enantioselective Direct Vinylogous Michael Addition of Functionalized Furanones to Nitroalkenes Catalyzed by an Axially Chiral Guanidine Base [作者：TERADA MASAHIRO; ANDO KENICHI,期刊：Organic Letters, 页码：2026-2029 , 文章类型： Article，,卷期：2011年13-8] The highly syn-diastereo- and enantioselective direct vinylogous Michael addition of a-thio substituted furanones with conjugate nitroalkenes was demonstrated using an axially chiral guanidine base catalyst. The method p... Regioselective Cobalt-Catalyzed Formation of Bicyclic 3-and 4-Aminopyridines [作者：GARCIA PIERRE; EVANNO YANNICK; GEORGE PASCAL; SEVRIN MIREILLE; RICCI GINO; MALACRIA MAX; AUBERT CORINNE; GANDON VINCENT,期刊：Organic Letters, 页码：2030-2033 , 文章类型： Article，,卷期：2011年13-8] Bimolecular cobalt-catalyzed [2 + 2 + 2] cycloadditions between yne-ynamides and nitriles afford bicyclic 3- or 4-aminopyridines in up to 100% yield. The high regioselectivity observed depends on the substitution pattern... Tirandamycins from Streptomyces sp 17944 Inhibiting the Parasite Brugia malayi Asparagine tRNA Synthetase [作者：YU ZHIGUO; VODANOVICJANKOVIC SANJA; LEDEBOER NATHAN; HUANG SHENGXIONG; RAJSKI SCOTT R; KRON MICHAEL; SHEN BEN,期刊：Organic Letters, 页码：2034-2037 , 文章类型： Article，,卷期：2011年13-8] Lymphatic filariasis is caused by the parasitic nematodes Brugia malayi and Wuchereria bancrofti, and asparaginyl-tRNA synthetase (AsnRS) is considered an excellent antifilarial target. The discovery of three new tiranda... "Click"-Capture, Ring-Opening Metathesis Polymerization (ROMP), Release: Facile Triazolation Utilizing ROMP-Derived Oligomeric Phosphates [作者：LONG TOBY R; FAISAL SAQIB; MAITY PRADIP K; ROLFE ALAN; KURTZ RYAN; KLIMBERG SARRA V; NAJJAR MUHAMMADRABBIE; BASHA FATIMA Z; HANSON PAUL R,期刊：Organic Letters, 页码：2038-2041 , 文章类型： Article，,卷期：2011年13-8] Soluble, high-load ring-opening metathesis polymerization (ROMP)-derived oligomeric triazole phosphates (OTP) are reported for application as efficient triazolating reagents of nucleophilic species. Utilizing a "Click"-c... A Straightforward Synthetic Entry to Cleavamine-Type Indole Alkaloids by a Ring-Closing Metathesis-Vinyl Halide Heck Cyclization Strategy [作者：BENNASAR M LLUISA; SOLE DANIEL; ZULAICA ESTER; ALONSO SANDRA,期刊：Organic Letters, 页码：2042-2045 , 文章类型： Article，,卷期：2011年13-8] An indole-templated ring-closing metathesis has been used to create the central nine-membered ring of the cleavamine-type alkaloids. A subsequent intramolecular vinyl halide Heck reaction upon the resulting azacyclononen... How To Prepare a Chiral Grignard Reagent: A Theoretical Proposal [作者：CHEN ZHENING; FU GANG; XU XIN,期刊：Organic Letters, 页码：2046-2049 , 文章类型： Article，,卷期：2011年13-8] It is shown that two competitive pathways (T2 vs T4) exist for Grignard reagent formation. While the nonradical pathway T2 leads to retention of the configuration, the radical pathway T4 gives racemization. Our calculati... Nickel-Catalyzed Reductive Cyclization of Organohalides [作者：KIM HYEJIN; LEE CHULBOM,期刊：Organic Letters, 页码：2050-2053 , 文章类型： Article，,卷期：2011年13-8] A mild and convenient nickel-catalyzed method for free-radical cyclization of organohalides is described. The use of a NiCl2 center dot DME/Pybox complex as the catalyst and zinc powder in methanol efficiently promotes t...