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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68条记录   Mild Nonepimerizing N-Alkylation of Amines by Alcohols without Transition Metals [作者：GUERIN CLAIRE; BELLOSTA VERONIQUE; GUILLAMOT GERARD; COSSY JANINE,期刊：Organic Letters, 页码：3534-3537 , 文章类型： Article，,卷期：2011年13-13] A one-pot two-step sequence involving an oxidation/imine-iminium formation/reduction allowed the N-alkylation of amines by alcohols without any epimerization when optically active alcohols and amines are involved in the ... Concise Total Synthesis of (+/-)-Cephalotaxine via a Transannulation Strategy: Development of a Facile Reductive oxy-Nazarov Cyclization [作者：LI WEIDONG Z; DUO WEIGUO; ZHUANG CHENGHAN,期刊：Organic Letters, 页码：3538-3541 , 文章类型： Article，,卷期：2011年13-13] A concise total synthesis of (+/-)-cephalotaxine (1) has been achieved from dioxolanone derivative 15 via a transannulation strategy. The key transformation is a facile reductive oxy-Nazarov cyclization as illustrated ab... Consecutive Condensation, C-N and N-N Bond Formations: A Copper- Catalyzed One-Pot Three-Component Synthesis of 2H-Indazole [作者：KUMAR MANIAN RAJESH; PARK AHBYEOL; PARK NAMJIN; LEE SUNWOO,期刊：Organic Letters, 页码：3542-3545 , 文章类型： Article，,卷期：2011年13-13] 2H-Indazoles are synthesized using copper-catalyzed, one-pot, three-component reactions of 2-bromobenzaldehydes, primary amines, and sodium azide. A copper catalyst plays the key role in the formation of C-N and N-N bond... Efficient Synthesis of 4,7-Diamino Substituted 1,10-Phenanthroline-2,9-dicarboxamides [作者：LARSEN ANDERS FOLLER; ULVEN TROND,期刊：Organic Letters, 页码：3546-3548 , 文章类型： Article，,卷期：2011年13-13] A convenient and high-yielding multigram synthesis of the versatile intermediate 4,7-dichloro-1,10-phenanthroline-2,9-dicarboxylic acid is described. The intermediate is further efficiently derivatized to 4,7-diamino-1,1... Asymmetric Synthesis of (+)-Mequitazine from Quinine [作者：LEROUX SEBASTIEN; LARQUETOUX LAURENT; NICOLAS MARC; DORIS ERIC,期刊：Organic Letters, 页码：3549-3551 , 文章类型： Article，,卷期：2011年13-13] The first asymmetric synthesis of the antihistaminic drug mequitazine is reported. Our approach started from quinine, a Cinchona alkaloid, whose chiral information was exploited for setting up the stereogenic center of (... Stereoselective Coupling Reaction of Dimethylzinc and Alkyne toward Nickelacycles (vol 13, pg 2266, 2011) [作者：MORI TAKAMICHI; NAKAMURA TOSHIYUKI; KIMURA MASANARI,期刊：Organic Letters, 页码：3552-3552 , 文章类型： Correction，,卷期：2011年13-13] Enone-Alkyne Reductive Coupling: A Versatile Entry to Substituted Pyrroles [作者：THOMPSON BENJAMIN B; MONTGOMERY JOHN,期刊：Organic Letters, 页码：3289-3291 , 文章类型： Article，,卷期：2011年13-13] The reductive coupling of enones or enals with alkynes, followed by olefin oxidative cleavage and Paal-Knorr cyclization, provides a versatile entry to a variety of pyrrole frameworks. A number of limitations of alternat... Unique Inclusion Properties of Crystalline Powder p-tert-Butylthiacalix[4]arene toward Alcohols and Carboxylic Acids [作者：MOROHASHI NAOYA; NOJI SHINTARO; NAKAYAMA HIROKO; KUDO YASUTAKA; TANAKA SHINYA; KABUTO CHIZUKO; HATTORI TETSUTARO,期刊：Organic Letters, 页码：3292-3295 , 文章类型： Article，,卷期：2011年13-13] Powdery crystals of p-tert-butylthiacalix[4]arene (2) selectively include EtOH from 1:1 mixtures of MeOH-EtOH and EtOH-PrOH, and EtCO2H from HCO2H-EtCO2H. On the other hand, no acid is included from HCO2H-MeCO2H, even th... A Cooperative Participation of the Amido Group in the Organocatalytic Construction of All-Carbon Quaternary Stereocenters by Michael Addition with beta-Ketoamides [作者：DUQUE MARIA DEL MAR SANCHEZ; BASLE OLIVIER; ISAMBERT NICOLAS; GAUDELSIRI ANOUK; GENISSON YVES; PLAQUEVENT JEANCHRISTOPHE; RODRIGUEZ JEAN; CONSTANTIEUX THIERRY,期刊：Organic Letters, 页码：3296-3299 , 文章类型： Article，,卷期：2011年13-13] The secondary amido group of a-substituted beta-ketoamides plays a crucial role in the control of the reactivity and spatial arrangement (selectivity) in the organocatalyzed Michael addition to unsaturated carbonyls. Thi... Simple N-Sulfinyl-Based Chiral Sulfur-Olefin Ligands for Rhodium-Catalyzed Asymmetric 1,4-Additions [作者：FENG XIANGQING; WANG YAZHOU; WEI BEIBEI; YANG JING; DU HAIFENG,期刊：Organic Letters, 页码：3300-3303 , 文章类型： Article，,卷期：2011年13-13] A variety of N-sulfinyl-based chiral sulfur-olefin ligands has been successfully developed for the first time for rhodium-catalyzed highly efficient and enantioselective 1,4-additions. The ease of synthesis and needless ... Synthesis and Photophysics of Dibenz[a,c]phenazine Derivatives [作者：ESTRADA LEANDRO A; NECKERS DOUGLAS C,期刊：Organic Letters, 页码：3304-3307 , 文章类型： Article，,卷期：2011年13-13] The synthesis of dipolar dibenz[a,c]phenazine (DBP) derivatives is described. The compounds possess little electronic communication between donor and acceptor units in the ground state regardless of the pattern of substi... Enantioselective Synthesis of the ABC Ring Motif of Norzoanthamine Based on Asymmetric Robinson Annulation Reactions [作者：NGUYEN THONG X; DAKANALI MARIANNA; TRZOSS LYNNIE; THEODORAKIS EMMANUEL A,期刊：Organic Letters, 页码：3308-3311 , 文章类型： Article，,卷期：2011年13-13] An enantioselective strategy for the synthesis of tetracyclic motif 5, representing the northern fragment of norzoanthamine, is presented. Key to the strategy is the use of two asymmetric Robinson annulation reactions th... A New Enabling Technology for Convenient Laboratory Scale Continuous Flow Processing at Low Temperatures [作者：BROWNE DUNCAN L; BAUMANN MARCUS; HARJI BASHIR H; BAXENDALE IAN R; LEY STEVEN V,期刊：Organic Letters, 页码：3312-3315 , 文章类型： Article，,卷期：2011年13-13] A new machine for conducting continuous flow processes at low temperatures on a laboratory scale is reported. The use of this cryogenic flow reactor has been demonstrated by the preparation of a variety of (hetero)aromat... Open-Shell Singlet Character of Stable Derivatives of Nonacene, Hexacene and Teranthene [作者：GAO XINGFA; HODGSON JENNIFER L; JIANG DEEN; ZHANG SHENGBAI B; NAGASE SHIGERU; MILLER GLEN P; CHEN ZHONGFANG,期刊：Organic Letters, 页码：3316-3319 , 文章类型： Article，,卷期：2011年13-13] The electronic ground states of the recently synthesized stable nonacene derivatives (J. Am. Chem. Soc. 2010, 132, 1261) are open-shell singlets with a polyradical nature instead of closed-shell singlets as originally, a... Biomimetic Cationic Polyannulation Reaction Catalyzed by Bi(OTf)(3): Cyclization of 1,6-Dienes, 1,6,10-Trienes, and Aryl Polyenes [作者：GODEAU JULIEN; OLIVERO SANDRA; ANTONIOTTI SYLVAIN; DUNACH ELISABET,期刊：Organic Letters, 页码：3320-3323 , 文章类型： Article，,卷期：2011年13-13] Nonactivated trienes and aryltrienes were cyclized into polycyclic compounds in good to excellent yields under bismuth triflate catalysis in a biomimetic fashion. The reaction showed broad applicability and allowed for t... Atom-Economical Chemoselective Synthesis of 1,4-Diynes and Polysubstituted Furans/Pyrroles from Propargyl Alcohols and Terminal Alkynes [作者：WANG TAO; CHEN XINLIANG; CHEN LI; ZHAN ZHUANGPING,期刊：Organic Letters, 页码：3324-3327 , 文章类型： Article，,卷期：2011年13-13] Under different conditions, the reaction of propargyl alcohols and terminal alkynes leads to the selective formation of 1,4-diynes and polysubstituted furans/pyrroles. Water is the only byproduct in the selective synthes...