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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83条记录   Palladium- and Nickel-Catalyzed Aminations of Aryl Imidazolylsulfonates and Sulfamates [作者：ACKERMANN LUTZ; SANDMANN RENE; SONG WEIFENG,期刊：Organic Letters, 页码：1784-1786 , 文章类型： Article，,卷期：2011年13-7] A nickel complex derived from dppf, along with NaOt-Bu as the base, allowed for challenging aminations of aryl sulfamates. An improved functional group tolerance is observed in novel palladium-catalyzed aminations of imi... Efficient, Enantioselective Assembly of Silanediol Protease Inhibitors [作者：BO YINGJIAN; SINGH SWAPNIL; HOAN QUOC DUONG; CAO CUI; SIEBURTH SCOTT MCN,期刊：Organic Letters, 页码：1787-1789 , 文章类型： Article，,卷期：2011年13-7] A five-step assembly of silicon-protected dipeptide mimics from commercially available reagents is described. This methodology makes silanediol protease inhibitors readily available for the first time. The sequence featu... Origins of Selectivity in Bronsted Acid-Promoted Diazoalkane-Azomethine Reactions (The Aza-Darzens Aziridine Synthesis) [作者：TROYER TIMOTHY L; MUCHALSKI HUBERT; HONG KI BUM; JOHNSTON JEFFREY N,期刊：Organic Letters, 页码：1790-1792 , 文章类型： Article，,卷期：2011年13-7] The mechanism of the Bronsted acid-catalyzed aza-Darzens reaction is explored by charting the stereochemical outcome of the triflic acid-promoted conversion of trans-triazolines to cis-aziridines. These experiments are c... Access to Enantiomerically Enriched cis-2,3-Disubstituted Azetidines via Diastereoselective Hydrozirconation [作者：PRADHAN TARUN K; KRISHNAN K SYAM; VASSE JEANLUC; SZYMONIAK JAN,期刊：Organic Letters, 页码：1793-1795 , 文章类型： Article，,卷期：2011年13-7] An asymmetric variant of the hydrozirconation reaction has been established starting from Boc-protected chiral allylic amines. The resulting diastereoselectively formed N-functionalized organozirconiums can be considered... Total Syntheses of (-)- and (+)-Goniomitine [作者：MIZUTANI MASAYA; INAGAKI FUYUHIKO; NAKANISHI TAKEO; YANAGIHARA CHIHIRO; TAMAI IKUMI; MUKAI CHISATO,期刊：Organic Letters, 页码：1796-1799 , 文章类型： Article，,卷期：2011年13-7] The Stille coupling reaction of 3-(benzyloxymethyl)-1-(tert-butyldiphenylsiloxy)ethyl-1-(tributylstannyl )allene with N-(tert-butoxycarbonyl)-2-iodoaniline directly produced the corresponding 2-vinylindole derivative, wh... Semicarbazones from N-Hydroxyureas and Amines: A Novel Entry in the Reactivity of the Acyl Nitroso Group [作者：PAZ JAIRO; PEREZBALADO CARLOS; IGLESIAS BEATRIZ; MUNOZ LUIS,期刊：Organic Letters, 页码：1800-1803 , 文章类型： Article，,卷期：2011年13-7] The condensation of carbamoyl nitroso compounds, obtained by oxidation of N-hydroxyureas, with amines unexpectedly afforded semicarbazones (aka carbamoyl hydrazones). Although the substitution of the nitrosyl moiety migh... Transformation of Anionically Activated Trifluoromethyl Groups to Heterocycles under Mild Aqueous Conditions [作者：QIAO JENNIFER X; WANG TAMMY C; HU CAROL; LI JIANQING; WEXLER RUTH R; LAM PATRICK Y S,期刊：Organic Letters, 页码：1804-1807 , 文章类型： Article，,卷期：2011年13-7] The (hetero)aromatic trifluoromethyl group is present in many biologically active molecules and is generally considered to be chemically stable. In this paper, a convenient one-step synthesis of C-C linked aryl-heterocyc... Alternative Demetalation Method for Cu(I)-Phenanthroline-Based Catenanes and Rotaxanes [作者：MEGIATTO JACKSON D JR; SCHUSTER DAVID I,期刊：Organic Letters, 页码：1808-1811 , 文章类型： Article，,卷期：2011年13-7] A new and less hazardous procedure for demetalation of Cu(I)-phenanthroline-based interlocked molecules, using aqueous MOH rather than toxic KCN, has been developed. The conditions are compatible with materials containin... Rapid Construction of [5-6-7] Tricyclic Ring Skeleton of Calyciphylline Alkaloid Daphnilongeranin B [作者：XU CHEN; LIU ZHENG; WANG HUIFEI; ZHANG BO; XIANG ZHENG; HAO XIAOJIANG; WANG DAVID ZHIGANG,期刊：Organic Letters, 页码：1812-1815 , 文章类型： Article，,卷期：2011年13-7] A concise photochemical [2 + 2] cycloaddition-Grob fragmentation sequence sets the common tricyclic ring skeletons of the Calyciphylline A-type alkaloids, particularly those in daphnilongeranins, daphniyunnines, and daph... Synthesis of Polycyclic Molecules by Double C(sp(2))-H/C(sp(3))-H Arylations with a Single Palladium Catalyst [作者：PIERRE CATHLEEN; BAUDOIN OLIVIER,期刊：Organic Letters, 页码：1816-1819 , 文章类型： Article，,卷期：2011年13-7] Polycyclic molecules were obtained in good yields by double C(sp(2))-H/C(sp(3))-H arylations mediated by a single palladium/phosphine catalyst. Both double intermoleculadintramolecular and intramoleculadintramolecular C-... Biosynthesis-Inspired Intramolecular Oxa-Conjugate Cyclization of alpha,beta-Unsaturated Thioesters: Stereoselective Synthesis of 2,6-cis-Substituted Tetrahydropyrans [作者：FUWA HARUHIKO; NOTO KENKICHI; SASAKI MAKOTO,期刊：Organic Letters, 页码：1820-1823 , 文章类型： Article，,卷期：2011年13-7] Intramolecular oxa-conjugate cyclization of alpha,beta-unsaturated thioesters under Bronsted acid catalysis, inspired by biosynthesis of polyketide natural products, provides a variety of 2,6-cis-substituted tetrahydropy... A Fluorous Phosphate Protecting Group with Applications to Carbohydrate Synthesis [作者：LIU LIN; POHL NICOLA L B,期刊：Organic Letters, 页码：1824-1827 , 文章类型： Article，,卷期：2011年13-7] The first fluorous protecting group for phosphate is reported. This group can be used as a facile tag for purification and be removed under mild reducing conditions using zinc and ammonium formate. Synthesis of a disacch... Flexible Strategy for Syntheses of Spirooxindoles using Palladium-Catalyzed Carbosilylation and Sakurai-Type Cyclization [作者：HANDE SUDHIR M; NAKAJIMA MOTOYUKI; KAMISAKI HARUHI; TSUKANO CHIHIRO; TAKEMOTO YOSHIJI,期刊：Organic Letters, 页码：1828-1831 , 文章类型： Article，,卷期：2011年13-7] The intramolecular carbosilylation of N-[2-(1,3-butenyl)aryl]carbamoyl chloride has been investigated. The reaction with hexamethyldisilane proceeds smoothly in the presence of a catalytic amount of [Pd(eta(3)-allyl)Cl](... Aqueous-Phase Deactivation and Intramolecular [2+2+2] Cycloaddition of Oxanorbornadiene Esters [作者：KISLUKHIN ALEXANDER A; HIGGINSON CODY J; FINN M G,期刊：Organic Letters, 页码：1832-1835 , 文章类型： Article，,卷期：2011年13-7] Both inter- and intramolecular degradation pathways were identified for the aqueous phase deactivation of oxanorbornadiene (OND) electrophiles, and propargylic OND esters were found to undergo facile intramolecular [2 + ... Assessing the Rates of Ring-Opening of Aziridinium and Azetidinium Ions: A Dramatic Ring Size Effect [作者：DE RYCKE NICOLAS; DAVID OLIVIER; COUTY FRANCOIS,期刊：Organic Letters, 页码：1836-1839 , 文章类型： Article，,卷期：2011年13-7] Rates for the ring-opening of aziridinium and azetidinium ions by DMAP were measured. The four-membered ring appears to be ca. 17 000 times less reactive compared to the three-membered ring but is still highly relevant f... Mild Addition of Nucleophiles to Pyridine-N-Oxides [作者：LONDREGAN ALLYN T; JENNINGS SANDRA; WEI LIUQING,期刊：Organic Letters, 页码：1840-1843 , 文章类型： Article，,卷期：2011年13-7] A general and facile one-pot procedure for the synthesis of 2-substituted pyridines from the corresponding pyridine-N-oxides and nucleophiles is presented as a mild alternative to SNAr chemistry. A variety of nucleophile...