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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80条记录   Toward a Visible Light Mediated Photocyclization: Cu-Based Sensitizers for the Synthesis of [5]Helicene [作者：HERNANDEZPEREZ AUGUSTO C; VLASSOVA ANNA; COLLINS SHAWN K,期刊：Organic Letters, 页码：2988-2991 , 文章类型： Article，,卷期：2012年14-12] A photochemical synthesis of [5]helicene employing a copper-based sensitizer 7 has been developed that avoids the disadvantages associated with the traditional UV light mediated method. The visible light mediated synthes... Selective Catalytic sp(3) C-O Bond Cleavage with C-N Bond Formation in 3-Alkoxy-1-propanols [作者：CHEN CHENG; HONG SOON HYEOK,期刊：Organic Letters, 页码：2992-2995 , 文章类型： Article，,卷期：2012年14-12] The ruthenium catalyzed selective sp(3) C-O cleavage with amide formation was reported in reactions of 3-alkoxy-1-propanol derivatives and amines. The cleavage only occurs at the C3-O position even with 3-benzyloxy-1-pro... Palladium-Catalyzed Conjugate Addition of Terminal Alkynes to Enones [作者：VILLARINO LARA; GARCIAFANDINO REBECA; LOPEZ FERNANDO; MASCARENAS JOSE L,期刊：Organic Letters, 页码：2996-2999 , 文章类型： Article，,卷期：2012年14-12] A practical protocol for the hydroalkynylation of enones using Pd catalysis is reported. The reaction proceeds efficiently with a variety of alkynes as well as with several cyclic and acyclic enones, providing synthetica... Site-Specific Modification of Amino Acids and Peptides by Aldehyde-Alkyne-Amine Coupling under Ambient Aqueous Conditions [作者：UHLIG NICK; LI CHAOJUN,期刊：Organic Letters, 页码：3000-3003 , 文章类型： Article，,卷期：2012年14-12] A highly efficient method for the direct, site-specific functionalization of amino acids and peptides, under ambient conditions, is described. In aqueous, nearly solvent-free conditions, copper(I) chloride catalyzed the ... Switching Regioselectivity in the Allylation of Imines by N-Side Chain Tuning [作者：DELAYE PIERREOLIVIER; VASSE JEANLUC; SZYMONIAK JAN,期刊：Organic Letters, 页码：3004-3007 , 文章类型： Article，,卷期：2012年14-12] A spectacular inversion of alpha- to gamma-regioselectivity in the allylzincation of imines can be achieved by fine-tuning of the N-side chain. This approach allows easy preparation of regioisomeric amines, in racemic as... Manganese Porphyrin Catalyzed Cycloisomerization of Enynes [作者：OZAWA TAKUYA; KURAHASHI TAKUYA; MATSUBARA SEIJIRO,期刊：Organic Letters, 页码：3008-3011 , 文章类型： Article，,卷期：2012年14-12] Cycloisomerization of 1,6-enynes to five- or six-membered ring systems is successfully carried out in the presence of a cationic manganese(III) catalyst. The use of a structurally rigid tetradentate porphyrin as the equa... Directly Fused Highly Substituted Naphthalenes via Pd-Catalyzed Dehydrogenative Annulation of N,N-Dimethylaminomethyl Ferrocene Using a Redox Process with a Substrate [作者：ZHANG HAO; CUI XIULING; YAO XIANGNA; WANG HUI; ZHANG JIANYE; WU YANGJIE,期刊：Organic Letters, 页码：3012-3015 , 文章类型： Article，,卷期：2012年14-12] N,N-Dimethylaminomethyl ferrocenium could be generated in situ and served as a terminal oxidant for Pd-catalyzed directly dehydrogenative annulations of N,N-dimethylaminomethyl ferrocene and internal alkynes. This proced... Why a Proximity-Induced Diels-Alder Reaction Is So Fast [作者：KRENSKE ELIZABETH H; PERRY EMMA W; JEROME STEVEN V; MAIMONE THOMAS J; BARAN PHIL S; HOUK K N,期刊：Organic Letters, 页码：3016-3019 , 文章类型： Article，,卷期：2012年14-12] Unlike normal Diels-Alder reactions of acyclic alkadienes with alkenes, the vinylbicyclo[2.2.2]octene employed in the Baran total synthesis of vinigrol undergoes a quantitative Diels-Alder reaction with a tethered alkene... Recyclable Hypervalent Iodine(III) Reagent Iodosodilactone as an Efficient Coupling Reagent for Direct Esterification, Amidation, and Peptide Coupling [作者：TIAN JUN; GAO WENCHAO; ZHOU DONGMEI; ZHANG CHI,期刊：Organic Letters, 页码：3020-3023 , 文章类型： Article，,卷期：2012年14-12] A hypervalent iodine(III) reagent plays a novel role as an efficient coupling reagent to promote the direct condensation between carboxylic acids and alcohols or amines to provide esters, macrocyclic lactones, amides, as... A New Stereocontrolled Synthetic Route to (-)-Echinosporin from D-Glucose via Padwa Allenylsulfone [3+2]-Anionic Cycloadditive Elimination [作者：FLASZ JAKUB T; HALE KARL J,期刊：Organic Letters, 页码：3024-3027 , 文章类型： Article，,卷期：2012年14-12] A new formal total synthesis of (-)-echinosporin has been developed based upon the Padwa [3 + 2]-cycloadditive elimination reaction of allenylsulfone 4 with the D-glucose-derived enone 14 which provides cycloadduct 12. Diastereo- and Enantioselective Synthesis of (E)-2-Methyl-1,2-syn- and (E)-2-Methyl-1,2-anti-3-pentenediols via Allenylboronate Kinetic Resolution with ((d)Ipc)(2)BH and Aldehyde Allylboration [作者：HAN JENGLIANG; CHEN MING; ROUSH WILLIAM R,期刊：Organic Letters, 页码：3028-3031 , 文章类型： Article，,卷期：2012年14-12] Enantioselective hydroboration of racemic allenylboronate (+/-)-1 with 0.48 equiv of ((d)Ipc)(2)BH at -25 degrees C proceeds with efficient kinetic resolution and provides allylborane (R)-Z-4. When heated to 95 degrees C... Ruthenium-Catalyzed Highly Regioselective Cyclization of Ketoximes with Alkynes by C-H Bond Activation: A Practical Route to Synthesize Substituted Isoquinolines [作者：CHINNAGOLLA RAVI KIRAN; PIMPARKAR SANDEEP; JEGANMOHAN MASILAMANI,期刊：Organic Letters, 页码：3032-3035 , 文章类型： Article，,卷期：2012年14-12] Aromatic and heteroaromatic ketoximes underwent cyclization with alkynes in the presence of a catalytic amount of [{RuCl2(p-cymene)}(2)] and NaOAc to give isoquinoline derivatives in good to excellent yields in a highly ... HPLC-Assisted Automated Oligosaccharide Synthesis [作者：GANESH N VIJAYA; FUJIKAWA KOHKI; TAN YIH HORNG; STINE KEITH J; DEMCHENKO ALEXEI V,期刊：Organic Letters, 页码：3036-3039 , 文章类型： Article，,卷期：2012年14-12] A standard HPLC was adapted to polymer supported oligosaccharide synthesis. Solution-based reagents are delivered using a software-controlled solvent delivery system. The reaction progress and completion can be monitored... Organocatalyzed Enantioselective Formal [4+2] Cycloadclition of 2,3-Disubstituted Indole and Methyl Vinyl Ketone [作者：CAI QUAN; YOU SHULI,期刊：Organic Letters, 页码：3040-3043 , 文章类型： Article，,卷期：2012年14-12] A formal [4 + 2] cycloaddition of 2,3-disubstituted indoles with vinyl methyl ketone was realized in the presence of a catalytic amount of quinine-derived primary amine and pentafluorobenzoic acid. This method provides b... Ketone Formation via Mild Nickel-Catalyzed Reductive Coupling of Alkyl Halides with Aryl Acid Chlorides [作者：WU FAN; LU WENBIN; QIAN QUN; REN QINGHUA; GONG HEGUI,期刊：Organic Letters, 页码：3044-3047 , 文章类型： Article，,卷期：2012年14-12] The present work highlights unprecedented Ni-catalyzed reductive coupling of unactivated alkyl iodides with aryl acid chlorides to efficiently generate alkyl aryl ketones under mild conditions. Synthesis of Indolines, Indoles, and Benzopyrrolizidinones from Simple Aryl Azides [作者：BRUCELLE FRANCOIS; RENAUD PHILIPPE,期刊：Organic Letters, 页码：3048-3051 , 文章类型： Article，,卷期：2012年14-12] A simple approach to prepare indolines and benzopyrrolizidinones from ortho-azidoallylbenzenes via a tandem radical addition/cyclization is described. The use of triethylborane to initiate and sustain the process provide...