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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66条记录   4,5-Bis(dimethylamino)quinolines: Proton Sponge versus Azine Behavior [作者：DYABLO OLGA V; SHMOILOVA ELENA A; POZHARSKII ALEXANDER F; OZERYANSKII VALERY A; BUROV OLEG N; STARIKOVA ZOYA A,期刊：Organic Letters, 页码：4134-4137 , 文章类型： Article，,卷期：2012年14-16] Two first representatives, 5 and 6, of the still unknown 4,5-bis(dimethylamino)quinoline have been synthesized and studied. While the former, being protonated either at the peri-NMe2 groups or at the ring nitrogen, has b... Highly Stereoselective Synthesis of Primary, Secondary, and Tertiary alpha-S-Sialosides under Lewis Acidic Conditions [作者：NOEL AMANDINE; DELPECH BERNARD; CRICH DAVID,期刊：Organic Letters, 页码：4138-4141 , 文章类型： Article，,卷期：2012年14-16] N-Acetyl 4-O,5-N-oxazolidinone protected sialyl phosphates of either anomeric configuration are excellent donors for the formation of alpha-S-sialosides at -78 degrees C in dichloromethane with primary, secondary, and te... Biosynthetic Pathway for High Structural Diversity of a Common Dilactone Core in Antimycin Production [作者：YAN YAN; ZHANG LIHAN; ITO TAKUYA; QU XUDONG; ASAKAWA YOSHINORI; AWAKAWA TAKAYOSHI; ABE IKURO; LIU WEN,期刊：Organic Letters, 页码：4142-4145 , 文章类型： Article，,卷期：2012年14-16] We herein report comparative analysis of two versions of the biosynthetic gene clusters of antimycins, a natural product family possessing up to 44 distinct entities. The biosynthetic pathway of antimycins is amenable to... Unique Proline-Benzoquinone Pigment from the Colored Nectar of "Bird's Coca Cola Tree" Functions in Bird Attractions [作者：LUO SHIHONG; LIU YAN; HUA JUAN; NIU XUEMEI; JING SHUXI; ZHAO XU; SCHNEIDER BERND; GERSHENZON JONATHAN; LI SHENGHONG,期刊：Organic Letters, 页码：4146-4149 , 文章类型： Article，,卷期：2012年14-16] The major pigment responsible for the dark brown nectar of the "bird's Coca cola tree", Leucosceptrum canum (Labiatae), was isolated and identified as a unique symmetric proline-quinone conjugate, 2,5-di-(N-(-)-prolyl)-p... The Control of Photochromism of [3H]-Naphthopyran Derivatives with Intramolecular CH-pi Bonds [作者：FRIGOLI MICHEL; MAUREL FRANCOIS; BERTHET JEROME; DELBAERE STEPHANIE; MARROT JEROME; OLIVEIRA MARIA M,期刊：Organic Letters, 页码：4150-4153 , 文章类型： Article，,卷期：2012年14-16] The photochromism of [3H]-naphthopyran derivatives can be switched from T-type to inverse- or P-type through the manipulation of relative thermodynamic stabilities of open isomers with intramolecular CH-pi bonds. An Antilock Molecular Braking System [作者：SUN WEITING; HUANG SHOULING; YAO HSUANHSIAO; CHEN ICHIA; LIN YINGCHIH; YANG JYESHANE,期刊：Organic Letters, 页码：4154-4157 , 文章类型： Article，,卷期：2012年14-16] A light-driven molecular brake displaying an antilock function is constructed by introducing a nonradiative photoinduced electron transfer (PET) decay channel to compete with the trans (brake-off) -> cis (brake-on) photo... Metal-Free, NHPI Catalyzed Oxidative Cleavage of C-C Double Bond Using Molecular Oxygen as Oxidant [作者：LIN RIYUAN; CHEN FENG; JIAO NING,期刊：Organic Letters, 页码：4158-4161 , 文章类型： Article，,卷期：2012年14-16] A metal-free N-hydroxyphthalimide (NHPI) catalyzed aerobic oxidative cleavage of olefins has been developed. Molecular oxygen is used as the oxidant and reagent for this oxygenation reaction. This methodology has prevent... Goniomedines A and B: Unprecedented Bisindole Alkaloids Formed through Fusion of Two Indole Moieties via a Dihydropyran Unit [作者：BENIDDIR MEHDI A; MARTIN MARIETHERESE; DAU MARIEELISE TRAN HUU; GRELLIER PHILIPPE; RASOANAIVO PHILIPPE; GUERITTE FRANCOISE; LITAUDON MARC,期刊：Organic Letters, 页码：4162-4165 , 文章类型： Article，,卷期：2012年14-16] Two novel bisindole alkaloids, goniomedines A (1) and B (2), possessing an unprecedented quebrachamine-pleioarpamine-type skeleton, in which indole moieties are fused via a dihydropyran unit, were isolated from the stem ... Rhodium(III)- and Ruthenium(II)-Catalyzed Olefination of Isoquinolones [作者：ZHAO PENG; NIU RUI; WANG FEN; HAN KELI; LI XINGWEI,期刊：Organic Letters, 页码：4166-4169 , 文章类型： Article，,卷期：2012年14-16] NH and N-protected isoquinolones undergo Rh(III)-catalyzed oxidative olefination at the 8-position. Complementary redox-neutral olefination of such isoquinolones using internal alkynes was achieved under ruthenium cataly... Versatile 2,7-Substituted Pyrene Synthons for the Synthesis of Pyrene-Fused Azaacenes [作者：MORE SANDEEP; BHOSALE RAJESH; CHOUDHARY SUNIL; MATEOALONSO AURELIO,期刊：Organic Letters, 页码：4170-4173 , 文章类型： Article，,卷期：2012年14-16] A new synthetic route to prepare a series of versatile 2,7-substituted pyrene synthons for the synthesis of pyrene-fused azaacenes is described. By using such synthons, a library of eight pyrene-fused azacenes with diffe... Synthesis from D-Altrose of (5R,6R,7R,8S)-5,7-Dihydroxy-8-hydroxymethylconidine and 2,4-Dideoxy-2,4-imino-D-glucitol, Azetidine Analogues of Swainsonine and 1,4-Dideoxy-1,4-imino-D-mannitol [作者：ARAUJO NOELIA; JENKINSON SARAH F; MARTINEZ R FERNANDO; GLAWAR ANDREAS F G; WORMALD MARK R; BUTTERS TERRY D; NAKAGAWA SHINPEI; ADACHI ISAO; KATO ATSUSHI; YOSHIHARA AKIHIDE; AKIMITSU KAZUYA; IZUMORI KEN; FLEET GEORGE W J,期刊：Organic Letters, 页码：4174-4177 , 文章类型： Article，,卷期：2012年14-16] Ring closure of a 3,5-di-O-triflate derived from D-altrose with benzylamine allowed the formation of both monocyclic and bicyclic azetidine analogues of swainsonine. Geminal Alkene-Alkyne Cross Metathesis Using a Relay Strategy [作者：CLARK JOSEPH R; FRENCH JONATHAN M; JECS EDGARS; DIVER STEVEN T,期刊：Organic Letters, 页码：4178-4181 , 文章类型： Article，,卷期：2012年14-16] A relay strategy was employed to achieve an intermolecular ene-yne metathesis between 1,1-disubstituted alkenes and alkynes. The relay serves to activate an unreactive alkene which will not participate in ene-yne metathe... Nickel-Catalyzed Amination of Aryl Sulfamates and Carbamates Using an Air-Stable Precatalyst [作者：HIE LIANA; RAMGREN STEPHEN D; MESGANAW TEHETENA; GARG NEIL K,期刊：Organic Letters, 页码：4182-4185 , 文章类型： Article，,卷期：2012年14-16] A facile nickel-catalyzed method to achieve the amination of synthetically useful aryl sulfamates and carbamates is reported. Contrary to most Ni-catalyzed amination reactions, this user-friendly approach relies on an ai... Allyloxy and Propargyloxy Group Migration: Role of Remote Group Participation in the Synthesis of 5-C-Nucleosides and Other Sugar Derivatives [作者：MUKHERJEE SUBHRANGSHU; TRIPATHI PRABHASH N; MENDAL SUKHENDU B,期刊：Organic Letters, 页码：4186-4189 , 文章类型： Article，,卷期：2012年14-16] In 1-deoxy-xylofuranose derivatives possessing a good leaving group at 2-C, participation of allyloxy and propargyloxy substituents at 5-C results in loss of the 2-C substituent and attack of various nucleophiles at 5-C ... Highly Electron-Deficient Hexaazapentacenes and Their Dihydro Precursors [作者：HE ZIKAI; MAO RENXIN; LIU DANQING; MIAO QIAN,期刊：Organic Letters, 页码：4190-4193 , 文章类型： Article，,卷期：2012年14-16] Novel silylethynylated N-heteropentacenes that have three adjacent pyrazine rings at the center of a pentacene backbone are reported. These hexaazapentacenes exhibit a record low energy level of lowest unoccupied molecul... Convergent Syntheses of 3,6-Dihydroxydec-4-enolides [作者：KILLEN JONATHAN C; AXFORD LORRAINE C; NEWBERRY SARAH E; SIMPSON THOMAS J; WILLIS CHRISTINE L,期刊：Organic Letters, 页码：4194-4197 , 文章类型： Article，,卷期：2012年14-16] The total syntheses of the 3,6-dihydroxydecanolide from Cordyceps militaris and the novel C-3 epimer are reported using a diastereoselective Nozaki-Hiyama-Kishi reaction in the key cyclization to generate the 6R stereoce...