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68条记录   Total Syntheses of Graphisin A and Sydowinin B [作者：LITTLE ANDREW; PORCO JOHN A JR,期刊：Organic Letters, 页码：2862-2865 , 文章类型： Article，,卷期：2012年14-11] Efficient syntheses of the highly substituted benzophenone graphisin A and the xanthone sydowinin B are described. Key steps involve aryl anion addition to substituted benzaldehyde derivatives, subsequent methyl ester in... Photochemical Generation and Reactivity of the Major Hydroxyl Radical Adduct of Thymidine [作者：SAN PEDRO JOANNA MARIA N; GREENBERG MARC M,期刊：Organic Letters, 页码：2866-2869 , 文章类型： Article，,卷期：2012年14-11] 5,6-Dihydro-5-hydroxythymidin-6-yl radical (1), the major reactive intermediate resulting from hydroxyl radical addition to C5 of the pyrimidine, is produced via 350 nm photolysis of a 2,5-dimethoxyphenylsulfide precurso... Copper-Mediated Oxidative Cross-Coupling Reaction of Terminal Alkynes with alpha-Silyldifluoromethylphosphonates: An Efficient Method for alpha,alpha-Difluoropropargylphosphonates [作者：JIANG XUELIANG; CHU LINGLING; QING FENGLING,期刊：Organic Letters, 页码：2870-2873 , 文章类型： Article，,卷期：2012年14-11] A copper-mediated oxidative cross-coupling reaction of terminal alkynes with readily available alpha-silyldifluoromethylphosphonates under mild conditions has been developed. This method allows for an efficient synthesis... Ruthenium(II)-Catalyzed Synthesis of Hydroxylated Arenes with Ester as an Effective Directing Group [作者：YANG YIQING; LIN YUN; RAO YU,期刊：Organic Letters, 页码：2874-2877 , 文章类型： Article，,卷期：2012年14-11] An unprecedented Ru(II) catalyzed ortho-hydroxylation has been developed for the facile synthesis of a variety of multifunctionalized arenes from easily accessible ethyl benzoates with ester as an efficient directing gro... Diastereocontrolled Construction of Pactamycin's Complex Ureido Triol Functional Array [作者：MALINOWSKI JUSTIN T; MCCARVER STEFAN J; JOHNSON JEFFREY S,期刊：Organic Letters, 页码：2878-2881 , 文章类型： Article，,卷期：2012年14-11] An advanced Intermediate In a projected synthesis of pactamycin has been prepared. Early Installation of the C1-dImethylurea functionality allows for its participation in a diastereoselective, chelation-controlled additi... Electrophilic Trifluoromethylation by Copper-Catalyzed Addition of CF3-Transfer Reagents to Alkenes and Alkynes [作者：JANSON PAR G; GHONEIM IBRAHIM; ILCHENKO NADIA O; SZABO KALMAN J,期刊：Organic Letters, 页码：2882-2885 , 文章类型： Article，,卷期：2012年14-11] Regio- and stereoselective Cu-catalyzed addition of the above hypervalent iodine reagent to alkynes and alkenes was achieved. In the presence of Cul, the reaction is suitable to perform trifluoromethyl-benzoyloxylation a... Total Synthesis of (-)-Teucvidin [作者：LIU XIAOZU; LEE CHISING,期刊：Organic Letters, 页码：2886-2889 , 文章类型： Article，,卷期：2012年14-11] A concise enantioselective synthesis of (-)-teucvidin has been achieved. Our synthetic strategy involved the diastereoselective Michael/Conia-ene cascade cyclization reaction for rapid establishment of the cis-decalin sk... A New and Useful Method for the Macrocyclization of Linear Peptides [作者：LONDREGAN ALLYN T; FARLEY KATHLEEN A; LIMBERAKIS CHRIS; MULLINS PATRICK B; PIOTROWSKI DAVID W,期刊：Organic Letters, 页码：2890-2893 , 文章类型： Article，,卷期：2012年14-11] A new and useful procedure for the macrocyclization of linear peptides is described. The natural amino acid side chains of tyrosine (phenol), lysine (alkylamine), and histidine (imidazole) react in an Intramolecular fash... N-Heterocyclic Carbene (NHC)-Catalyzed Highly Diastereo- and Enantioselective Oxo-Diels-Alder Reactions for Synthesis of Fused Pyrano[2,3-b]indoles [作者：YANG LIMIN; WANG FEI; CHUA PEI JUAN; LV YUNBO; ZHONG LIANGJUN; ZHONG GUOFU,期刊：Organic Letters, 页码：2894-2897 , 文章类型： Article，,卷期：2012年14-11] A chiral N-heterocyclic carbene (NHC)-catalyzed Diels-Alder reaction of 2-oxoindolin-3-ylidenes and alpha-chloroaldehydes was developed for the synthesis of fused pyrano[2,3-b]indoles in good to excellent yields (up to 9... A Versatile Scaffold for Site-Specific Modification of Cyclic Tetrapeptides [作者：WHITE CHRISTOPHER J; YUDIN ANDREI K,期刊：Organic Letters, 页码：2898-2901 , 文章类型： Article，,卷期：2012年14-11] A novel scaffold that can be used to prepare conformationally homogeneous cyclic tetrapeptides equipped with a beta-amino acid residue is disclosed. It Is shown that regioselective structural modification can be accompli... Palladium-Catalyzed Desymmetrization of Silacyclobutanes with Alkynes: Enantioselective Synthesis of Silicon-Stereogenic 1-Sila-2-cyclohexenes and Mechanistic Considerations [作者：SHINTANI RYO; MORIYA KOHEI; HAYASHI TAMIO,期刊：Organic Letters, 页码：2902-2905 , 文章类型： Article，,卷期：2012年14-11] A palladium-catalyzed enantioselective desymmetrization of silacyclobutanes with alkynes has been developed to give silicon-stereogenic 1-sila-2-cyclohexenes with high enantioselectivity. The products thus obtained under... Efficient Synthesis of alpha-Tertiary alpha-Silylamines from Aryl Sulfonylimidates via One-Pot, Sequential C-Si/C-C Bond Formations [作者：HAN XIAOJUN; YAO MING; LU CHONGDAO,期刊：Organic Letters, 页码：2906-2909 , 文章类型： Article，,卷期：2012年14-11] An efficient and flexible route for the synthesis of alpha-tertiary (alpha,alpha-dibranched) alpha-silylamines via sequential reactions of sulfonylimidates using readily available phenyldimethylsilyllithium and Grignard ... A General, Enantioselective Synthesis of Protected Morpholines and Piperazines [作者：OREILLY MATTHEW C; LINDSLEY CRAIG W,期刊：Organic Letters, 页码：2910-2913 , 文章类型： Article，,卷期：2012年14-11] A short, high yielding protocol has been developed for the enantioselective and general synthesis of C2-functionalized, benzyl protected morpholines and orthogonally N,N'-protected piperazines from a common intermediate.... Synthesis of 1,2-Disubstituted Cyclopentenes by Palladium-Catalyzed Reaction of Homopropargyl-Substituted Dicarbonyl Compounds with Organic Halides via 5-Endo-Dig Cyclization [作者：FUJINO DAISHI; YORIMITSU HIDEKI; OSUKA ATSUHIRO,期刊：Organic Letters, 页码：2914-2917 , 文章类型： Article，,卷期：2012年14-11] Palladium catalysts with bulky biaryl phosphine ligands allow homopropargyl-substituted dicarbonyl compounds to undergo intramolecular addition via a rare 5-endo-dig pathway. C-C bond forming reductive elimination follow... Cine Substitution of Arenes Using the Aryl Carbamate as a Removable Directing Group [作者：MESGANAW TEHETENA; NATHEL NOAH F FINE; GARG NEIL K,期刊：Organic Letters, 页码：2918-2921 , 文章类型： Article，,卷期：2012年14-11] An efficient and controlled means to achieve a rare cine substitution of arenes is reported. The methodology relies on the strategic use of aryl O-carbamates as readily removable directing groups for arene functionallzat... Intramolecular Methylation of an Allyl Sulfone via Lithium Alkoxyaluminate; Application to the Enantioselective Synthesis of the CD Ring of Vitamin D-3 [作者：SIKERVAR VIKAS; FUCHS PHILIP L,期刊：Organic Letters, 页码：2922-2924 , 文章类型： Article，,卷期：2012年14-11] Alcohol-directed intramolecular methylation of an enantiopure allyl sulfone using AIMe(3) provides a trans-hydrindane CD ring alcohol. The substrate cis-CD ring allyl sulfone alcohol is prepared via intramolecular allyl ...