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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69条记录   One-Pot Synthesis of Ammonia-Borane and Trialkylamine-Boranes from Trimethyl Borate [作者：RAMACHANDRAN P VEERARAGHAVAN; RAJU BHIMAPAKA C; GAGARE PRAVIN D,期刊：Organic Letters, 页码：6119-6121 , 文章类型： Article，,卷期：2012年14-24] A one-pot procedure for the preparation of ammonia borane from trimethyl borate in 90% yield and >99% purity has been reported. This methodology has been modified to prepare a series of trialkylamine-boranes in 70-82% yi... An Organic Molecule Modulated Chemoselective Cyclization of Alkynyl Nitriles Tethered to 2-Alkyl Substituted Chromones with Multireactive Sites [作者：HUANG LIPING; LIU YANG; XIE FUCHUN; HU YOUHONG,期刊：Organic Letters, 页码：6122-6125 , 文章类型： Article，,卷期：2012年14-24] A small organic molecule phenylacetonitrile promoted chemoselective cyclization of (chromen-3-yl)alkynylnitriles to generate a novel tetracyclic or tricyclic chromone scaffold has been discovered. Importantly, the phenyl... Convenient Method for the Synthesis of a Flexible Cyclic Polyamide for Selective Targeting of c-myb G-quadruplex DNA [作者：ZHANG QIANG; CUI XIAOJIE; LIN SEN; ZHOU JIANG; YUAN GU,期刊：Organic Letters, 页码：6126-6129 , 文章类型： Article，,卷期：2012年14-24] A convenient efficient method for synthesis of a flexible cyclic polyamide (c beta, 1) was developed through cyclodimerization. Electrospray ionization mass spectrometry and nuclear magnetic resonance results showed that... Regioselective Prins Cyclization of Allenylsilanes. Stereoselective Formation of Multisubstituted Heterocyclic Compounds [作者：OKADA TAKUYA; SHIMODA AIRI; SHINADA TETSURO; SAKAGUCHI KAZUHIKO; OHFUNE YASUFUMI,期刊：Organic Letters, 页码：6130-6133 , 文章类型： Article，,卷期：2012年14-24] The Prins cyclization of hydroxy or amino group-containing allenylsilanes with carbonyl compounds occurred at the allenic terminus in a regio- and stereoselective manner to give the di- or trisubstituted tetrahydrofurans... Phosphine-Triggered Tandem Annulation between Morita-Baylis-Hillman Carbonates and Dinucleophiles: Facile Syntheses of Oxazepanes, Thiazepanes, and Diazepanes [作者：ZHOU RONG; WANG JIANFANG; DUAN CHONG; HE ZHENGJIE,期刊：Organic Letters, 页码：6134-6137 , 文章类型： Article，,卷期：2012年14-24] A new phosphine-triggered tandem [3 + 4] annulation reaction between Morita-Baylis-Hillman carbonates and 1,4-diheteroatom dinucleophiles has been developed, which provides a facile synthetic method for saturated seven-m... Efficient Synthesis of Benzo[1,2-b:6,5-b ']dithiophene-4,5-dione (BDTD) and Its Chemical Transformations into Precursors for pi-Conjugated Materials [作者：ARROYAVE FRANK A; RICHARD CORALIE A; REYNOLDS JOHN R,期刊：Organic Letters, 页码：6138-6141 , 文章类型： Article，,卷期：2012年14-24] A straightforward synthesis of the fused-aromatic dione benzo[1,2-b:6,5-b']dithiophene-4,5-dione (BDTD) has been developed. This fused-aromatic dione was subjected to various chemical transformations to generate diverse ... Carboxyl Formation from Methyl via Triple Hydroxylations by XiaM in Xiamycin A Biosynthesis [作者：ZHANG QINGBO; LI HUIXIAN; LI SUMEI; ZHU YIGUANG; ZHANG GUANGTAO; ZHANG HAIBO; ZHANG WENJUN; SHI RONG; ZHANG CHANGSHENG,期刊：Organic Letters, 页码：6142-6145 , 文章类型： Article，,卷期：2012年14-24] The P450 enzyme XiaM was identified as a candidate to form the C-24 carboxyl group in xiamycin A (1). Alteration of medium composition led to the discovery of four new compounds from the Delta xiaM and the Delta xiaK (en... Hemicarceplex Formation With a Cyclotriveratrylene-Based Molecular Cage Allows Isolation of High-Purity (>= 99.0%) C-70 Directly from Fullerene Extracts [作者：LI MINGJHE; HUANG CHIHAO; LAI CHIENCHEN; CHIU SHENGHSIEN,期刊：Organic Letters, 页码：6146-6149 , 文章类型： Article，,卷期：2012年14-24] A cyclotriveratrylene-based molecular cage that favors the formation of a room temperature isolable hemicarceplex with C-70, in the presence of C-60, has been developed. Significant differences in the association and dis... Synthesis of Meso-Halogenated BODIPYs and Access to Meso-Substituted Analogues [作者：LEEN VOLKER; YUAN PEIJIA; WANG LINA; BOENS NOEL; DEHAEN WIM,期刊：Organic Letters, 页码：6150-6153 , 文章类型： Article，,卷期：2012年14-24] 8-Halogenated boradiaza-s-indacenes can be efficiently prepared from dipyrrylketones. The new dyes react smoothly with nucleophiles to yield N-, O-, and S-substituted chromophores, as well as transition-metal-catalyzed c... Densanins A and B, New Macrocyclic Pyrrole Alkaloids Isolated from the Marine Sponge Haliclona densaspicula [作者：HWANG BUYNG SU; OH JUNG SOON; JEONG EUN JU; SIM CHUNG J; RHO JUNGRAE,期刊：Organic Letters, 页码：6154-6157 , 文章类型： Article，,卷期：2012年14-24] Densanins A (1) and B (2) were isolated from the sponge Haliclona densaspicula. On the basis of spectral data and the Mosher ester method, the complete structures were characterized as hexacyclic diamine alkaloids, which... Iridium-Catalyzed Asymmetric Hydrogenation of alpha-Substituted alpha,beta-Unsaturated Acyclic Ketones: Enantioselective Total Synthesis of (-)-Mesembrine [作者：ZHANG QIANQIAN; XIE JIANHUA; YANG XIAOHUI; XIE JIANBO; ZHOU QILIN,期刊：Organic Letters, 页码：6158-6161 , 文章类型： Article，,卷期：2012年14-24] A highly efficient asymmetric hydrogenation of alpha-substituted alpha,beta-unsaturated acyclic ketones catalyzed by chiral spiro iridium complexes for the preparation of chiral 2-substituted allylic alcohols has been de... Substituted Imidazo[1,2-a]pyridines as beta-Strand Peptidomimetics [作者：KANG CHANG WON; SUN YONGMAO; DEL VALLE JUAN R,期刊：Organic Letters, 页码：6162-6165 , 文章类型： Article，,卷期：2012年14-24] New conformationally extended dipeptide surrogates based on an imidazo[1,2-a]pyridine scaffold are described. Efficient synthesis and incorporation into host peptides affords structures with native side-chain functionali... The Synthesis of Melohenine B and a Related Natural Product [作者：LANCEFIELD CHRISTOPHER S; ZHOU LINNA; LEBL TOMAS; SLAWIN ALEXANDRA M Z; WESTWOOD NICHOLAS J,期刊：Organic Letters, 页码：6166-6169 , 文章类型： Article，,卷期：2012年14-24] A concise synthesis of melohenine B and O-ethyl-14-epimelohenine B, from eburnamonine, was achieved via a biomimetic diastereoselective singlet oxygen-mediated oxidative cleavage of the indole C2-C7 bond. These studies e... Straightforward and Highly Efficient Synthesis of Diselenocarbamates [作者：PAN XIANGQIANG; ZHU JIAN; ZOU JIANPING; ZHANG ZHENGBIAO; CHENG ZHENPING; ZHOU NIANCHEN; ZHANG WEI; ZHU XIULIN,期刊：Organic Letters, 页码：6170-6173 , 文章类型： Article，,卷期：2012年14-24] A highly efficient and simple synthesis of diselenocarbamates, based on a one-pot reaction of amines, CSe2, and alkyl halides in the absence of a catalyst under solvent-free conditions, is reported. The first efficient s... Synthesis of Differentially Substituted 1,2-Diamines through Advances in C-H Amination Technology [作者：OLSON DAVID E; ROBERTS D ALLEN; DU BOIS J,期刊：Organic Letters, 页码：6174-6177 , 文章类型： Article，,卷期：2012年14-24] A general, high yielding method for the synthesis of 1,2-diamine derivatives is described that capitalizes on selective, rhodium-catalyzed C-H insertion of hydroxylamine-based sulfamate esters. The resulting Troc-protect... Hydrolytic Enantioselective Protonation of Cyclic Dienyl Esters and a beta-Diketone with Chiral Phase-Transfer Catalysts [作者：YAMAMOTO EIJI; GOKUDEN DAICHI; NAGAI AYANO; KAMACHI TAKASHI; YOSHIZAWA KAZUNARI; HAMASAKI AKIYUKI; ISHIDA TAMAO; TOKUNAGA MAKOTO,期刊：Organic Letters, 页码：6178-6181 , 文章类型： Article，,卷期：2012年14-24] Hydrolytic enantioselective protonation of dienyl esters and a beta-diketone catalyzed by phase-transfer catalysts are described. The latter reaction is the first example of an enantio-convergent retro-Claisen condensati...