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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74条记录   Facile 1,3-diaza-Claisen Rearrangements of Tertiary Allylic Amines Bearing an Electron-Deficient Alkene. [作者：Aranha, Rachel M.;Bowser, Amy M.;Madalengoitia, Jose S.;,期刊：Organic Letters, 页码：575-578 , 文章类型： 研究论文，,卷期：2009年11-3] Tertiary allylic amines with an electron-deficient alkene react with isocyanates and isothiocyanates to give highly substituted ureas and thioureas arising from formal 1,3-diaza-Claisen rearrangements. Isocyanates and is... Highly Enantioselective Vinyl Additions of Vinylaluminum to Ketones Catalyzed by a Titanium(IV) Catalyst of (S)-BINOL. [作者：Biradar, Deepak Baburao;Gau, Han-Mou;,期刊：Organic Letters, 页码：499-502 , 文章类型： 研究论文，,卷期：2009年11-3] We report a novel asym. addn. of vinyl group to ketones using vinylaluminum reagents catalyzed by in situ prepd. Ti(OiPr)4 complexes of (S)-BINOL to afford diversified tertiary allylic alcs. Varieties of arom. ketones b... Retention of Configuration in Photolytic Decarboxylation of Peresters to Form Chiral Acetals and Ethers. [作者：Spantulescu, M. Daniel;Boudreau, Marc A.;Vederas, John C.;,期刊：Organic Letters, 页码：645-648 , 文章类型： 研究论文，,卷期：2009年11-3] Peresters generate ethers in good yields when photolyzed in the absence of solvent using short wavelength UV light. At -78癈 or below, the process proceeds predominantly with retention of configuration at the site adjace... Catalytic, Nucleophilic Allylation of Aldehydes with Allyl Acetate. [作者：Denmark, Scott E.;Nguyen, Son T.;,期刊：Organic Letters, 页码：781-784 , 文章类型： 研究论文，,卷期：2009年11-3] A new catalytic allylation of aldehydes has been developed that employs allyl acetate as the allylating reagent. Under catalysis by ruthenium trichloride (3 mol %) in the presence of carbon monoxide (30 psi), water (1.5... Design of a bisamidinium Claisen rearrangement catalyst for monodentate substrates. [作者：Annamalai, Venkatachalam R.;Linton, Elizabeth C.;Kozlowski, Marisa C.;,期刊：Organic Letters, 页码：621-624 , 文章类型： 研究论文，,卷期：2009年11-3] A bisamidinium catalyst has been designed for the Claisen rearrangement. The primary design feature is a dual hydrogen bonding array that can coordinate a singular oxygen atom of the substrate. The ability to function ... DFT Calculations on Heterocyclacenes. [作者：Kornmayer, Stefan C.;Esser, Birgit;Gleiter, Rolf;,期刊：Organic Letters, 页码：725-728 , 文章类型： 研究论文，,卷期：2009年11-3] eight-membered or six-membered rings contg. divalent sulfur and nitrogen atoms were studied by theor. means with respect to their geometries and relative energies using DFT calcns. In all four cases, the authors predict... Two limonoids, khayalenoids A and B with an Unprecedented 8-Oxa-tricyclo[4.3.2.02,7]undecane motif, from Khaya senegalensis. [作者：Yuan, Tao;Yang, Sheng-Ping;Zhang, Chuan-Rui;Zhang, Sheng;Yue, Jian-Min;,期刊：Organic Letters, 页码：617-620 , 文章类型： 研究论文，,卷期：2009年11-3] nortriterpenoid core, were isolated from the stems of Khaya senegalensis. Their structures with abs. configuration were detd. by spectroscopic data, X-ray crystallog., and CD anal. Syntheses and Properties of the New Electron Transfer Sensitizers 4,2'-Pyrylogens. [作者：Clennan, Edward L.;Warrier, Ajaya Kumar Sankara;,期刊：Organic Letters, 页码：685-688 , 文章类型： 研究论文，,卷期：2009年11-3] The syntheses and characterizations of the 4,2'-regioisomers of the dicationic pyrylogen electron transfer sensitizers are reported. The electrochem. and photophys. properties of these sensitizers are compared to the pr... Designer Discodermolide Segments via Ozonolysis of Vinyl Phosphonates. [作者：Mollat du Jourdin, Xavier;Noshi, Mohammad;Fuchs, P. L.;,期刊：Organic Letters, 页码：543-546 , 文章类型： 研究论文，,卷期：2009年11-3] To apply our collection of enantiopure 7-ring vinyl sulfones to probe the anticancer SAR of a series of computer-designed (+)-discodermolide analogs, the ozonolytic reactivity of transposed cyclic vinyl phosphonates was ... Toward the Total Synthesis of the Brasilinolides: Construction of a Differentially Protected C20-C38 Segment. [作者：Paterson, Ian;Burton, Paul M.;Cordier, Christopher J.;Housden, Michael P.;Muhlthau, Friedrich A.;Loiseleur, Olivier;,期刊：Organic Letters, 页码：693-696 , 文章类型： 研究论文，,卷期：2009年11-3] addns. and ketone redns. were employed to construct the two related stereotetrads, while a sequence of Horner-Wadsworth-Emmons (HWE) coupling, CBS redn., and Sharpless AE installed the epoxy alc. functionality. A Rapid, Asymmetric Synthesis of the Decahydrofluorene Core of the Hirsutellones. [作者：Tilley, S. David;Reber, Keith P.;Sorensen, Erik J.;,期刊：Organic Letters, 页码：701-703 , 文章类型： 研究论文，,卷期：2009年11-3] A tandem ketene-trapping/Diels-Alder cyclization sequence was the pivotal transformation in an efficient, asym. synthesis of a decahydrofluorene tricyclic structure I possessing eight stereogenic centers and key features... Tandem Enyne Metathesis-Metallotropic [1,3]-Shift for a Concise Total Syntheses of (+)-Asperpentyn, (-)-Harveynone, and (-)-Tricholomenyn A. [作者：Li, Jingwei;Park, Sangho;Miller, Reagan L.;Lee, Daesung;,期刊：Organic Letters, 页码：571-574 , 文章类型： 研究论文，,卷期：2009年11-3] A tandem reaction sequence involving relay metathesis-induced enyne RCM and metallotropic [1,3]-shift is an effective tool to construct cyclic alkenes with embedded 1,5-dien-3-yne moieties from acyclic precursors contg. ... An Approach to 3,6-Disubstituted 2,5-Dioxybenzoquinones via Two Sequential Suzuki Couplings. Three-Step Synthesis of Leucomelone. [作者：Gan, Xianwen;Jiang, Wei;Wang, Wei;Hu, Lihong;,期刊：Organic Letters, 页码：589-592 , 文章类型： 研究论文，,卷期：2009年11-3] Two sequential Suzuki coupling reactions have been developed for efficient synthesis of synthetically and biol. important 3,6-disubstituted 2,5-dioxybenzoquinone architectures in a highly chemoselective controlled manner... Amide-directed alkenylation of sp2 C-H bonds catalyzed by a cationic Rh(I)/BIPHEP complex under mild conditions: dramatic rate acceleration by a 1-pyrrolidinecarbonyl group. [作者：Shibata, Yu;Otake, Yousuke;Hirano, Masao;Tanaka, Ken;,期刊：Organic Letters, 页码：689-692 , 文章类型： 研究论文，,卷期：2009年11-3] A cationic rhodium(I)/BIPHEP complex catalyzes amide-directed regioselective alkenylations of olefinic or arom. sp2 C-H bonds in good yields under mild reaction conditions. The use of a 1-pyrrolidinecarbonyl group as a ... Mechanistic aspects of alkyne migration in alkylidene carbenoid rearrangements. [作者：Bichler, Paul;Chalifoux, Wesley A.;Eisler, Sara;Shi Shun, Annabelle L. K.;Chernick, Erin T.;Tykwinski, Rik R.;,期刊：Organic Letters, 页码：519-522 , 文章类型： 研究论文，,卷期：2009年11-3] propensity of the alkynyl RCYC- group to migrate in an alkynyl-vinylidene carbenoid intermediate species. Lithiation of R3SiCYCCR1:13CBr2 or R3SiCYC13CR1:CBr2 (R = Me, iPr) was performed for generation of the correspond... Instantaneous Deprotection of Tosylamides and Esters with SmI2/Amine/Water. [作者：Ankner, Tobias;Hilmersson, Goeran;,期刊：Organic Letters, 页码：503-506 , 文章类型： 研究论文，,卷期：2009年11-3] SmI2/amine/water mediates instantaneous cleavage of tosyl amides and tosyl esters. Highly hindered, sensitive and functionalized substrates were successfully deprotected in near quant. yield.