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60条记录   Sn-Free Ni-Catalyzed Reductive Coupling of Glycosyl Bromides with Activated Alkenes. [作者：Gong, Hegui;Andrews, R. Stephen;Zuccarello, Joseph L.;Lee, Stephen J.;Gagne, Michel R.;,期刊：Organic Letters, 页码：879-882 , 文章类型： 研究论文，,卷期：2009年11-4] A mild, stereoselective method for the Ni-catalyzed synthesis of a-C-alkylglycosides is reported. This approach entails the reductive coupling of glycosyl bromides with activated alkenes at room temp., with low alkene l... Unexpected Orthogonality of S-Benzoxazolyl and S-Thiazolinyl Glycosides: Application to Expeditious Oligosaccharide Assembly. [作者：Kaeothip, Sophon;Pornsuriyasak, Papapida;Rath, Nigam P.;Demchenko, Alexei V.;,期刊：Organic Letters, 页码：799-802 , 文章类型： 研究论文，,卷期：2009年11-4] Thorough mechanistic studies of the alkylation pathway for the activation of glycosyl thioimidates have led to the development of the "thioimidate-only orthogonal strategy". Discrimination among S-thiazolinyl (STaz) and... 1,5-a-D-Mannoseptanosides, Ring-Size Isomers That Are Impervious to a-Mannosidase-Catalyzed Hydrolysis. [作者：Boone, Matthew A.;McDonald, Frank E.;Lichter, Joseph;Lutz, Stefan;Cao, Rui;Hardcastle, Kenneth I.;,期刊：Organic Letters, 页码：851-854 , 文章类型： 研究论文，,卷期：2009年11-4] corresponding mannopyranosyl oligosaccharides have been prepd. Remarkably, these compds. show no inhibition of the a-mannosidase-catalyzed hydrolysis of p-nitrophenyl-a-D-mannopyranoside. One-Pot Formation and Characterization of Macrocyclic Aromatic Tetrasulfonates. [作者：Geng, Mingwei;Zhang, Dechun;Wu, Xiangxiang;He, Lan;Gong, Bing;,期刊：Organic Letters, 页码：923-926 , 文章类型： 研究论文，,卷期：2009年11-4] Arom. tetrasulfonate macrocycles were prepd. in one pot by treating arenedisulfonyl chlorides with dihydroxyarenes. X-ray structures revealed that these cyclic mols. have noncollapsible cavities and well-defined conform... New benzotriazole and benzimidazole scaffolds from Ugi-Smiles couplings of isocyanides. [作者：Coffinier, Didier;El Kaim, Laurent;Grimaud, Laurence;,期刊：Organic Letters, 页码：995-997 , 文章类型： 研究论文，,卷期：2009年11-4] When allylamine is used as the amino input in Ugi-Smiles couplings of o-nitrophenols, the resulting adducts can be deallylated by a palladium-catalyzed process leading to a formal Ugi-Smiles coupling with ammonia. This ... Sequential Cu(I)/Pd(0)-Catalyzed Multicomponent Coupling and Annulation Protocol for the Synthesis of Indenoisoquinolines. [作者：Jayanth, Thiruvellore Thatai;Zhang, Lei;Johnson, Thomas S.;Malinakova, Helena C.;,期刊：Organic Letters, 页码：815-818 , 文章类型： 研究论文，,卷期：2009年11-4] Copper-catalyzed coupling of imines, vinylstannanes, or alkynes and o-bromoaroyl chlorides followed by Pd(0)-catalyzed annulations afforded indenoisoquinolines, e.g. I. Protocols requiring minimal purifications were dev... In situ Reduction in Photocycloadditions: A Method to Prevent Secondary Photoreactions. [作者：Tedaldi, Lauren M.;Baker, James R.;,期刊：Organic Letters, 页码：811-814 , 文章类型： 研究论文，,卷期：2009年11-4] deployment in synthesis. In situ redns. which remove the chromophore from the product as it is formed provide a convenient method to prevent these secondary photoreactions. NHC-Catalyzed Ring Expansion of Oxacycloalkane-2-carboxaldehydes: A Versatile Synthesis of Lactones. [作者：Wang, Li;Thai, Karen;Gravel, Michel;,期刊：Organic Letters, 页码：891-893 , 文章类型： 研究论文，,卷期：2009年11-4] Imidazolinium-derived carbenes catalyze the ring-expansion lactonization of oxacycloalkane-2-carboxaldehydes. A variety of functionalized five-, six-, and seven-membered lactones can be formed efficiently under mild rea... Synthesis of potential early-stage intermediates in the biosynthesis of FR900482 and Mitomycin C. [作者：Chamberland, Stephen;Gruschow, Sabine;Sherman, David H.;Williams, Robert M.;,期刊：Organic Letters, 页码：791-794 , 文章类型： 研究论文，,卷期：2009年11-4] Beyond the identification of 3-amino-5-hydroxybenzoic acid (AHBA) and D-glucosamine as biosynthetic precursors to Mitomycin C and FR900482, little is known about the pathway Nature uses to prep. these antitumor antibioti... Intermolecular Nonreductive Alkylation of Enamides via Radical-Polar Crossover. [作者：Friestad, Gregory K.;Wu, Yaoping;,期刊：Organic Letters, 页码：819-822 , 文章类型： 研究论文，,卷期：2009年11-4] iodoacetonitrile to enamides. Despite the presence of tri-n-butylstannane, nonreductive addn. was predominant; H-atom transfer from tin hydride was not obsd. Rapid iodine atom transfer to (or electron transfer from) th... A Versatile Approach to b-Amyloid Fibril-Binding Compounds Exploiting the Shirakawa/Hayashi Protocol for trans-Alkene Synthesis. [作者：Huynh, Tri H. V.;Mantel, Mette Louise H.;Mikkelsen, Katrine;Lindhardt, Anders T.;Nielsen, Niels Chr.;Otzen, Daniel;Skrydstrup, Troels;,期刊：Organic Letters, 页码：999-1002 , 文章类型： 研究论文，,卷期：2009年11-4] Application of the Sonogashira coupling reaction followed by a trans-selective alkyne redn. proved highly adaptable for the efficient synthesis of a class of b-amyloid fibril binding compds. possessing a styrylbenzene mo... Unique Effect of Coordination of an Alkene Moiety in Products on Ruthenium-Catalyzed Chemoselective C-H Alkenylation. [作者：Ueno, Satoshi;Kochi, Takuya;Chatani, Naoto;Kakiuchi, Fumitoshi;,期刊：Organic Letters, 页码：855-858 , 文章类型： 研究论文，,卷期：2009年11-4] Ruthenium-catalyzed alkenylation of 2'-alkoxyacetophenones with alkenylboronates provides ortho C-H alkenylation products, i.e. I, without sacrificing an ether functional group at the other ortho position. Both excellent... Intermolecular Antiselective and Enantioselective Reductive Coupling of Enones and Aromatic Aldehydes with Chiral Rh(Phebox) Catalysts. [作者：Shiomi, Takushi;Adachi, Takahiro;Ito, Jun-ichi;Nishiyama, Hisao;,期刊：Organic Letters, 页码：1011-1014 , 文章类型： 研究论文，,卷期：2009年11-4] The intermol. reductive coupling reaction of cyclopent-2-enone and arom. aldehydes was realized by chiral rhodium-(bisoxazolinyl)phenyl catalysts, Rh(Phebox-Ph)(OAc)2(H2O), with diphenymethylsilane as a hydride donor to ... Multicomponent Synthesis of a-Branched Amides. [作者：DeBenedetto, Mikkel V.;Green, Michael E.;Wan, Shuangyi;Park, Jung-Hyun;Floreancig, Paul E.;,期刊：Organic Letters, 页码：835-838 , 文章类型： 研究论文，,卷期：2009年11-4] acyl chlorides. The resulting acylimines react with a variety of p-nucleophiles in the presence of Lewis acids to form the desired amides. E.g., hydrozirconation of NCCH(OEt)(CH2)4Et with Cp2ZrHCl, acylation with MeCH2... Catalytic Redox-Initiated Glycolate Aldol Additions of Silyl Glyoxylates. [作者：Greszler, Stephen N.;Johnson, Jeffrey S.;,期刊：Organic Letters, 页码：827-830 , 文章类型： 研究论文，,卷期：2009年11-4] Lanthanide triisopropoxides catalyze a rapid, tandem MPV redn./Brook rearrangement/aldol sequence between silyl glyoxylates and aldehydes that achieves catalytic turnover through alkoxide transfer from a strain-release L... Rapid, General Access to Chiral b-Fluoroamines and b,b-Difluoroamines via Organocatalysis. [作者：Fadeyi, Olugbeminiyi O.;Lindsley, Craig W.;,期刊：Organic Letters, 页码：943-946 , 文章类型： 研究论文，,卷期：2009年11-4] A rapid, general route to enantiopure b-fluoroamines and b,b-difluoroamines has been developed employing organocatalysis in both a two-pot and a one-pot procedure. Both chem. yields (64-82%) and enantioselectivity (94-9...