个性化文献订阅>文章检索

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61条记录   ortho-Lithiophenyl Isocyanide: A Versatile Precursor for 3H-Quinazolin-4-ones and 3H-Quinazolin-4-thiones. [作者：Lygin, Alexander V.;de Meijere, Armin;,期刊：Organic Letters, 页码：389-392 , 文章类型： 研究论文，,卷期：2009年11-2] Ortho-Lithiophenyl isocyanide has been generated from ortho-bromophenyl isocyanide and successfully employed toward the synthesis of 2-substituted Ph isocyanides as well as 2,3-disubstituted 3H-quinazolin-4-ones and 3H-q... Copper-Facilitated Suzuki Reactions: Application to 2-Heterocyclic Boronates. [作者：Deng, James Z.;Paone, Daniel V.;Ginnetti, Anthony T.;Kurihara, Hideki;Dreher, Spencer D.;Weissman, Steven A.;Stauffer, Shaun R.;Burgey, Christopher S.;,期刊：Organic Letters, 页码：345-347 , 文章类型： 研究论文，,卷期：2009年11-2] The palladium-catalyzed Suzuki-Miyaura reaction has been utilized as one of the most powerful methods for C-C bond formation. However, Suzuki reactions of electron-deficient 2-heterocyclic boronates generally give low c... A New Catalytic Prins Cyclization Leading to Oxa- and Azacycles. [作者：Miranda, Pedro O.;Carballo, Ruben M.;Martin, Victor S.;Padron, Juan I.;,期刊：Organic Letters, 页码：357-360 , 文章类型： 研究论文，,卷期：2009年11-2] A new Prins cyclization process that builds up one carbon-carbon bond, one heteroatom-carbon bond, and one halogen-carbon bond, (in an oxa- and azacycle) relies on an iron catalyst system formed from Fe(acac)3 and trimet... Catalytic Asymmetric 1,3-Dipolar Cycloaddition of Azomethine Ylides with a,b-Unsaturated Ketones. [作者：Hernandez-Toribio, Jorge;Gomez Arrayas, Ramon;Martin-Matute, Belen;Carretero, Juan C.;,期刊：Organic Letters, 页码：393-396 , 文章类型： 研究论文，,卷期：2009年11-2] a,b-Unsatd. ketones are no longer the missing dipolarophiles in catalytic asym. 1,3-dipolar cycloaddn. of azomethine ylides. In the presence of CuI-Fesulfos complexes as catalysts (5 mol %), these substrates combine hig... Stereogenic Motif Consisting of Rigid Ring and Intraannular Chains: Isolation and Structures of Stereoisomers of 9-Alkyl-1,8-anthrylene-Butadiynylene Cyclic Dimers. [作者：Toyota, Shinji;Onishi, Hiroyuki;Kawai, Yoshihiro;Morimoto, Takaaki;Miyahara, Hiroaki;Iwanaga, Tetsuo;Wakamatsu, Kan;,期刊：Organic Letters, 页码：321-324 , 文章类型： 研究论文，,卷期：2009年11-2] isomerization is attributed to the steric hindrance between the alkyl chains and the rigid framework. Total Synthesis of Brevetoxin A. [作者：Crimmins, Michael T.;Zuccarello, J. Lucas;Ellis, J. Michael;McDougall, Patrick J.;Haile, Pamela A.;Parrish, Jonathan D.;Emmitte, Kyle A.;,期刊：Organic Letters, 页码：489-492 , 文章类型： 研究论文，,卷期：2009年11-2] A total synthesis of brevetoxin A (I) is reported. Two tetracyclic coupling partners, prepd. from previously reported advanced fragments, were effectively united via a Horner-Wittig olefination. The resulting octacycle... A Facile Method for the Preparation of MOM-Protected Carbamates. [作者：Barnes, David M.;Barkalow, Jufang;Plata, Daniel J.;,期刊：Organic Letters, 页码：273-275 , 文章类型： 研究论文，,卷期：2009年11-2] A novel method for the prepn. of MOM-protected carbamates is described that avoids the use of MOM-Cl, a regulated carcinogen. The two-step, one-pot procedure generates a reactive N-chloromethyl carbamate that is quenche... Stable Preformed Chiral Palladium Catalysts for the One-Pot Asymmetric Reductive Amination of Ketones. [作者：Rubio-Perez, Laura;Perez-Flores, F. Javier;Sharma, Pankaj;Velasco, Luis;Cabrera, Armando;,期刊：Organic Letters, 页码：265-268 , 文章类型： 研究论文，,卷期：2009年11-2] The application of air stable preformed [(R)-BINAP]PdBr2, [(S)-BINAP]PdBr2, [(R)-Tol-BINAP]PdBr2, and [(S,S)-CHIRAPHOS]PdBr2 complexes in the one-pot asym. reductive amination of various carbonyl compds., leading to chir... Palladium-Catalyzed Cross Coupling Reaction of Benzyl Bromides with Diazoesters for Stereoselective Synthesis of (E)-a,b-Diarylacrylates. [作者：Yu, Wing-Yiu;Tsoi, Yuk-Tai;Zhou, Zhongyuan;Chan, Albert S. C.;,期刊：Organic Letters, 页码：469-472 , 文章类型： 研究论文，,卷期：2009年11-2] A Pd-catalyzed cross-coupling reaction of benzyl bromides with a-aryldiazoesters is described, and E-a,b-diarylacrylates were obtained in good yields and excellent E-to-Z selectivity (>20:1). A New Efficient Catalytic System for the Chemoselective Cobalt-Catalyzed Cross-Coupling of Aryl Grignard Reagents with Primary and Secondary Alkyl Bromides. [作者：Cahiez, Gerard;Chaboche, Christophe;Duplais, Christophe;Moyeux, Alban;,期刊：Organic Letters, 页码：277-280 , 文章类型： 研究论文，,卷期：2009年11-2] The cobalt-catalyzed alkylation of arom. Grignard reagents is performed in good yields by using a new simple and efficient catalytic system: CoCl2/TMEDA (1:1). Primary and secondary cyclic or acyclic alkyl bromides were... Palladium-Catalyzed, One-Pot, Three-Component Synthesis of Homoallylic Amines from Aldehydes, Anisidine, and Allyl Trifluoroacetate. [作者：Grote, Robin E.;Jarvo, Elizabeth R.;,期刊：Organic Letters, 页码：485-488 , 文章类型： 研究论文，,卷期：2009年11-2] An allylation reaction that generates homoallylic amines using allyl trifluoroacetate as a nucleophilic allylmetal precursor is reported. A palladium complex catalyzes two transformations in one pot: formation of allyls... Enantioselective, Ketoreductase-Based Entry into Pharmaceutical Building Blocks: Ethanol as Tunable Nicotinamide Reductant. [作者：Broussy, Sylvain;Cheloha, Ross W.;Berkowitz, David B.;,期刊：Organic Letters, 页码：305-308 , 文章类型： 研究论文，,卷期：2009年11-2] The use of NADH- and NADPH-dependent ketoreductases to access enantio-enriched pharmaceutical building blocks is reported. Seven structurally diverse synthons are obtained, including those for atomoxetine (KRED 132), ta... Enhancing the Divergent Activities of Betulinic Acid via Neoglycosylation. [作者：Goff, Randal D.;Thorson, Jon S.;,期刊：Organic Letters, 页码：461-464 , 文章类型： 研究论文，,卷期：2009年11-2] Using neoglycosylation, the impact of differential glycosylation upon the divergent anticancer and anti-HIV properties of the triterpenoid betulinic acid (BA) was examd. Each member from a library of 37 differentially g... Strict reagent control in the asymmetric allylboration of N-TIPS-a-amino aldehydes with the B-allyl-10-TMS-9-borabicyclo[3.3.2]decanes. [作者：Soto-Cairoli, Buddy;Soderquist, John A.;,期刊：Organic Letters, 页码：401-404 , 文章类型： 研究论文，,卷期：2009年11-2] The allylboration of enantiomerically pure N-triisopropylsilyl-a-amino aldehydes with B-allyl-10-trimethylsilyl-9-borabicyclo[3.3.2]decanes proceeds cleanly at -78 癈, exhibiting essentially complete reagent control. Aft... Synthesis and Comparative Antibacterial Activity of Verdamicin C2 and C2a. A New Oxidation of Primary Allylic Azides in Dihydro[2H]pyrans. [作者：Hanessian, Stephen;Szychowski, Janek;Maianti, J. Pablo;,期刊：Organic Letters, 页码：429-432 , 文章类型： 研究论文，,卷期：2009年11-2] A synthesis of verdamicin C2 and its congener C2a has been accomplished from sisomicin relying on a novel oxidative transformation of an allylic azide to the corresponding a,b-unsatd. aldehyde, and its stereocontrolled e... Hydroformylation of Homoallylic Azides: A Rapid Approach toward Alkaloids. [作者：Spangenberg, Thomas;Breit, Bernhard;Mann, Andre;,期刊：Organic Letters, 页码：261-264 , 文章类型： 研究论文，,卷期：2009年11-2] Unprecedented hydroformylation of homoallylic azides combined with useful one-pot operations provides an expeditive access to alkaloids.