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61条记录   Bronsted Acid-Catalyzed, Enantioselective, Vinylogous Mannich Reaction of Vinylketene Silyl N,O-Acetals. [作者：Giera, David S.;Sickert, Marcel;Schneider, Christoph;,期刊：Organic Letters, 页码：4259-4262 , 文章类型： 研究论文，,卷期：2008年10-19] Vinylketene silyl N,O-acetals, e.g. I, undergo chiral phosphoric acid-catalyzed, vinylogous Mukaiyama-Mannich reactions with imines and afford d-amino-a,b-unsatd. amides, e.g. II, in typically good yields, complete g-reg... 7-Hydroxycoumarin-Hemicyanine Hybrids: A New Class of Far-Red Emitting Fluorogenic Dyes. [作者：Richard, Jean-Alexandre;Massonneau, Marc;Renard, Pierre-Yves;Romieu, Anthony;,期刊：Organic Letters, 页码：4175-4178 , 文章类型： 研究论文，,卷期：2008年10-19] phenol-based fluorophores derived from 7-hydroxycoumarin are described. These hemicyanine-coumarin hybrids display promising spectroscopic features such as large apparent Stokes shift (ranging from 60 to 140 nm) and flu... Improved Synthesis of the Epoxy Isoprostane Phospholipid PEIPC and its Reactivity with Amines. [作者：Jung, Michael E.;Berliner, Judith A.;Koroniak, Lukasz;Gugiu, B. Gabriel;Watson, Andrew D.;,期刊：Organic Letters, 页码：4207-4209 , 文章类型： 研究论文，,卷期：2008年10-19] An improved synthesis of the naturally occurring hydroxy ketone 1-palmitoyl-2-(5,6)-epoxyisoprostane E2-sn-glycero-3-phosphocholine (PEIPC), a compd. that plays a role in endothelial activation in atherosclerosis, has be... Total Synthesis of (-)-Aplaminal. [作者：Smith, Amos B., III;Liu, Zhuqing;,期刊：Organic Letters, 页码：4363-4365 , 文章类型： 研究论文，,卷期：2008年10-19] The total synthesis and assignment of abs. configuration of (-)-aplaminal (I), a cytotoxic metabolite from a sea hare possessing a triazobicyclo[3.2.1]octane skeleton, has been achieved. The synthesis entailed condensat... Pd(OAc)2-Catalyzed cyclization of 2,3-allenoic acids in the presence of terminal a,b-unsaturated alkynones: a one-pot highly stereoselective synthesis of 4-(3'-oxo-1'(E)-alkenyl)-2(5H)-furanones. [作者：Chen, Guofei;Zeng, Rong;Gu, Zhenhua;Fu, Chunling;Ma, Shengming;,期刊：Organic Letters, 页码：4235-4238 , 文章类型： 研究论文，,卷期：2008年10-19] The Pd(OAc)2-catalyzed cyclization reaction of 2,3-allenoic acids in the presence of terminal a,b-unsatd. alkynones afforded an E/Z mixt. of 4-(3'-oxo-1'-alkenyl)-2(5H)-furanones. A subsequent complete isomerization of ... Acridine-Viologen Dyads: Selective Recognition of Single-Strand DNA through Fluorescence Enhancement. [作者：Kuruvilla, Elizabeth;Nandajan, Paramjyothi C.;Schuster, Gary B.;Ramaiah, Danaboyina;,期刊：Organic Letters, 页码：4295-4298 , 文章类型： 研究论文，,卷期：2008年10-19] Tolylacridine-viologen dyads show distinct fluorescence emission changes in the presence of double-strand DNA (dsDNA) and single-strand DNA (ssDNA) depending on the position of the linkage. The para isomer shows fluoresc... Folding a Conjugated Chain: Oligo(o-phenyleneethynylene-alt-p-phenyleneethynylene). [作者：Zhu, Ningbo;Hu, Wei;Han, Shuliang;Wang, Qi;Zhao, Dahui;,期刊：Organic Letters, 页码：4283-4286 , 文章类型： 研究论文，,卷期：2008年10-19] An oligo(o-phenylene-ethynylene-alt-p-phenylene-ethynylene) was synthesized to create a conjugated mol. capable of adopting a helical secondary structure. A special feature of such a folded mol. is that the effective di... 7-Silylcycloheptatrienes and Analogs: Reactivity and Selectivity in Cascade Processes. [作者：Beniazza, Redouane;Desvergnes, Valerie;Landais, Yannick;,期刊：Organic Letters, 页码：4195-4198 , 文章类型： 研究论文，,卷期：2008年10-19] 7-Silyl- and 7-silylmethylcycloheptatrienes react with acylnitroso reagents at room temp. to provide the corresponding silyl- and silymethylnorcaradiene cyclo-adducts. Depending on the reaction conditions, 7-silylmethyl... A Two-Directional Approach to Enantiopure 1,4-Difluoro-cyclohexenes: Synthesis of Difluorinated Cyclitol Analogs. [作者：Purser, Sophie;Claridge, Timothy D. W.;Odell, Barbara;Moore, Peter R.;Gouverneur, Veronique;,期刊：Organic Letters, 页码：4263-4266 , 文章类型： 研究论文，,卷期：2008年10-19] Enantiopure 1,4-difluoro-cyclohexenes were prepd. from readily available acetonide-protected (3S,4S)-hexa-1,5-diene-3,4-diol. In a two-directional mode, a double cross-metathesis reaction using allyltrimethylsilane as t... Regioselective Esterification of Vicinal Diols on Monosaccharide Derivatives via Mitsunobu Reactions. [作者：Wang, Guijun;Ella-Menye, Jean-Rene;St. Martin, Michael;Yang, Hao;Williams, Kristopher;,期刊：Organic Letters, 页码：4203-4206 , 文章类型： 研究论文，,卷期：2008年10-19] alcs. derived from D-glucose, D-mannose, and D-galactose via the Mitsunobu reaction. The benzoylation reaction of vicinal diols derived from monosaccharides under Mitsunobu conditions afforded monobenzoates with retenti... Au(I)-Catalyzed Ring Expanding Cycloisomerizations: Total Synthesis of Ventricosene. [作者：Sethofer, Steven G.;Staben, Steven T.;Hung, Olivia Y.;Toste, F. Dean;,期刊：Organic Letters, 页码：4315-4318 , 文章类型： 研究论文，,卷期：2008年10-19] The gold(I)-catalyzed cycloisomerization of enynes contg. an embedded cyclopropane unit leads selectively to the formation of ring systems contg. the cyclopropylmethyl cation. A subsequent Wagner-Merwein shift provides ... Cyclic Imine Nitro-Mannich/Lactamization Cascades: A Direct Stereoselective Synthesis of Multicyclic Piperidinone Derivatives. [作者：Jakubec, Pavol;Helliwell, Madeleine;Dixon, Darren J.;,期刊：Organic Letters, 页码：4267-4270 , 文章类型： 研究论文，,卷期：2008年10-19] An efficient nitro-Mannich/lactamization cascade of g-nitro esters I and II with cyclic imines, e.g. III (R1 = R2 = H, OMe; R1 = NO2, R2 = H), for the prepn. of architecturally complex multicyclic piperidinone ring-contg... Structural Determination of Montanacin D by Total Synthesis. [作者：Takahashi, Shunya;Hongo, Yayoi;Tsukagoshi, Yuki;Koshino, Hiroyuki;,期刊：Organic Letters, 页码：4223-4226 , 文章类型： 研究论文，,卷期：2008年10-19] The first total syntheses of acetogenin I and its 4S,8R-isomer are described. The key step involves intermol. metathesis of an a,b-unsatd. ketone carrying a tetrahydropyranyl lactone with a THF deriv. Compd. I has spec... A sequential metal-catalyzed C-N bond formation in the synthesis of 2-amido-indoles. [作者：Yao, Pei-Yuan;Zhang, Yu;Hsung, Richard P.;Zhao, Kang;,期刊：Organic Letters, 页码：4275-4278 , 文章类型： 研究论文，,卷期：2008年10-19] A sequential metal-catalyzed C-N bond formation employing ortho-haloaryl acetylenic bromides is described. The initial amidation is highly selective for Csp-N bond formation, leading to o-haloaryl-substituted ynamides t... One-pot synthesis of benzofurans via palladium-catalyzed enolate arylation with o-bromophenols. [作者：Eidamshaus, Christian;Burch, Jason D.;,期刊：Organic Letters, 页码：4211-4214 , 文章类型： 研究论文，,卷期：2008年10-19] A one-pot synthesis of benzofurans which utilizes a palladium-catalyzed enolate arylation is described. The process demonstrates broad substrate scope and provides differentially substituted benzofurans in moderate to e... Stereoselective Bromination Reactions Using Tridecylmethylphosphonium Tribromide in a "Stacked" Reactor. [作者：Ma, Kefeng;Li, Shaw;Weiss, Richard G.;,期刊：Organic Letters, 页码：4155-4158 , 文章类型： 研究论文，,卷期：2008年10-19] A new reagent, tridecylmethylphosphonium tribromide, and new procedures for bromination reactions of unsatd. substrates (including one that allows several substrates to be reacted in sequence) are described. The procedu...