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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45条记录   Protecting-Group-Based Colorimetric Monitoring of Fluorous-Phase and Solid-Phase Synthesis of Oligoglucosamines. [作者：Ko, Kwang-Seuk;Park, Gisun;Yu, Yang;Pohl, Nicola L.;,期刊：Organic Letters, 页码：5381-5384 , 文章类型： 研究论文，,卷期：2008年10-23] A new hydroxyl protecting group, nitrophthalimidobutyric (NPB) acid, has been synthesized in one solvent-free step for colorimetric monitoring of reaction cycles upon its facile removal with hydrazine acetate in the soli... Estimating the Stereoinductive Potential of Cinchona Alkaloids with a Prochiral Probe Approach. [作者：Wei, Yin;Sastry, G. Narahari;Zipse, Hendrik;,期刊：Organic Letters, 页码：5413-5416 , 文章类型： 研究论文，,卷期：2008年10-23] Cinchona alkaloids occupy a privileged status due to their optimal possession of two desirable properties, namely catalytic efficiency and stereoselectivity. This paper proposes a new quant. measure, the energy differen... Total Synthesis of (-)-Amathaspiramide F. [作者：Sakaguchi, Kazuhiko;Ayabe, Miki;Watanabe, Yusuke;Okada, Takuya;Kawamura, Kazushige;Shiada, Tetsuro;Ohfune, Yasufumi;,期刊：Organic Letters, 页码：5449-5452 , 文章类型： 研究论文，,卷期：2008年10-23] The stereoselective total synthesis of the marine alkaloid (-)-amathaspiramide F (I) was achieved from the a-hydroxy-a-ethynylsilane 2. The crucial steps in this synthesis involved not only the enolate Claisen rearrange... A Diastereoselective Total Synthesis of trans-Trikentrin A: A Ring Contraction Approach. [作者：Silva, Luiz F., Jr.;Craveiro, Marcus V.;,期刊：Organic Letters, 页码：5417-5420 , 文章类型： 研究论文，,卷期：2008年10-23] A new route to obtain the polyalkylated indole (?-trans-trikentrin A (I) was developed. The synthesis of this natural alkaloid features a thallium(III)-mediated ring contraction reaction to obtain the trans-1,3-disubsti... Amino- and Hydroxy-Functionalized 11-Azaartemisinins and Their Derivatives. [作者：Singh, Ajit Shankar;Verma, Ved Prakash;Hassam, Mohammad;Krishna, Naikade Niraj;Puri, Sunil K.;Singh, Chandan;,期刊：Organic Letters, 页码：5461-5464 , 文章类型： 研究论文，,卷期：2008年10-23] An efficient conversion of artemisinin into three new amino- and hydroxy-functionalized 11-aza prototypes I (X = NH2, OH, HOCH2CH2) has been achieved on a multigram scale by reaction with hydrazine, hydroxylamine, and 2-... Synthesis and Structure of Mycolactone E Isolated from Frog Mycobacterium. [作者：Aubry, Sylvain;Lee, Richard E.;Mahrous, Engy A.;Small, Pam L. C.;Beachboard, Dia;Kishi, Yoshito;,期刊：Organic Letters, 页码：5385-5388 , 文章类型： 研究论文，,卷期：2008年10-23] The structure of mycolactone E (I), isolated from the frog pathogen Mycobacterium liflandii, was established via org. synthesis. Within the mycolactone family of metabolites, a structural variation has been seen only at... Synthesis of the Tagetitoxin Core via Photo-Stevens Rearrangement. [作者：Mortimer, Anne J. Price;Aliev, Abil E.;Tocher, Derek A.;Porter, Michael J.;,期刊：Organic Letters, 页码：5477-5480 , 文章类型： 研究论文，,卷期：2008年10-23] The core structure I of the RNA polymerase inhibitor tagetitoxin has been synthesized by one-carbon ring expansion of bridged bicyclic monothioacetals. The key steps are intramol. ylide formation by reaction between the... Convenient One-Pot Synthesis of (E)-b-Aryl Vinyl Halides from Benzyl Bromides and Dihalomethanes. [作者：Bull, James A.;Mousseau, James J.;Charette, Andre B.;,期刊：Organic Letters, 页码：5485-5488 , 文章类型： 研究论文，,卷期：2008年10-23] stereoselectivity from benzyl bromides by a one-pot homologation/stereoselective elimination procedure. Convenient conditions involving the anion of diiodomethane and an excess of base provide complete consumption of th... Sequential Organocatalyzed Michael Addition/[3 + 2]-Heterocyclization for the Stereoselective Synthesis of Fused-Isoxazoline Precursors of Enantiopure Cyclopentanoids. [作者：Bonne, Damien;Salat, Lydie;Dulcere, Jean-Pierre;Rodriguez, Jean;,期刊：Organic Letters, 页码：5409-5412 , 文章类型： 研究论文，,卷期：2008年10-23] An asym. synthesis of functionalized cyclopentanoids bearing up to four stereogenic centers from easily accessible nitroalkenes and unsatd. aldehydes are described. The overall sequence includes an enantioselective orga... Encapsulation of Guests within a Gated Molecular Basket: Thermodynamics and Selectivity. [作者：Wang, Bao-Yu;Bao, Xiaoguang;Stojanovic, Sandra;Hadad, Christopher M.;Badjic, Jovica D.;,期刊：Organic Letters, 页码：5361-5364 , 文章类型： 研究论文，,卷期：2008年10-23] structural, yet dynamic, feature of the host has been revealed to permit the formation of a transient enclosed space capable of contg. haloalkanes, whose size/shape, electronic and entropic attributes contributed to the ... Highly (E)-Selective Wadsworth-Emmons Reactions Promoted by Methylmagnesium Bromide. [作者：Claridge, Timothy D. W.;Davies, Stephen G.;Lee, James A.;Nicholson, Rebecca L.;Roberts, Paul M.;Russell, Angela J.;Smith, Andrew D.;Toms, Steven M.;,期刊：Organic Letters, 页码：5437-5440 , 文章类型： 研究论文，,卷期：2008年10-23] An exptl. simple protocol for the very highly (E)-selective Wadsworth-Emmons reaction [(E):(Z) selectivities in excess of 180:1 in some cases] of a range of straight-chain and branched aliph., substituted arom., and base... Synthesis of a New Water-Soluble Oligo(phenylenevinylene) Containing a Tyrosine Moiety for Tyrosinase Activity Detection. [作者：Feng, Xuli;Feng, Fude;Yu, Minghui;He, Fang;Xu, Qingling;Tang, Hongwei;Wang, Shu;Li, Yuliang;Zhu, Daoben;,期刊：Organic Letters, 页码：5369-5372 , 文章类型： 研究论文，,卷期：2008年10-23] A new water-sol. oligo(phenylenevinylene) contg. a tyrosine unit (OPV-Tyr) was synthesized as a fluorescent probe to optically detect tyrosinase activity. Upon the addn. of tyrosinase, the tyrosine moiety was oxidized t... Highly Efficient Energy Transfer in Subphthalocyanine-BODIPY Conjugates. [作者：Liu, Jian-Yong;Yeung, Hoi-Sze;Xu, Wei;Li, Xiyou;Ng, Dennis K. P.;,期刊：Organic Letters, 页码：5421-5424 , 文章类型： 研究论文，,卷期：2008年10-23] Two novel subphthalocyanines substituted axially with a boron dipyrromethene (BODIPY) or distyryl BODIPY moiety have been synthesized. Both systems exhibit a highly efficient photoinduced energy transfer process, either... Total Synthesis of (-)-Agelastatin A. [作者：Yoshimitsu, Takehiko;Ino, Tatsunori;Tanaka, Tetsuaki;,期刊：Organic Letters, 页码：5457-5460 , 文章类型： 研究论文，,卷期：2008年10-23] A new route to (-)-agelastatin A (I) is reported. The requisite nitrogen functionalities of the agelastatin core have been installed by intramol. aziridination of an azidoformate and subsequent regioselective azidation,... First Total Synthesis of (?-3-Hydroxy-11-norcytisine: Structure Confirmation and Biological Characterization. [作者：Yohannes, Daniel;Hansen, Camilla P.;Akireddy, Srinivasa Rao;Hauser, Terry A.;Kiser, Melanie N.;Gurnon, Nicholas J.;Day, Cynthia S.;Bhatti, Balwinder;Caldwell, William S.;,期刊：Organic Letters, 页码：5353-5356 , 文章类型： 研究论文，,卷期：2008年10-23] The first total synthesis of (?-3-hydroxy-11-norcytisine (I), the racemate of natural product previously isolated from Laburnum anagyroides, structurally related to (-)-cytisine (II) and a benchmark ligand at neuronal ni... Expeditious Total Syntheses of Camptothecin and 10-Hydroxycamptothecin. [作者：Liu, Guan-Sai;Dong, Qing-Li;Yao, Yuan-Shan;Yao, Zhu-Jun;,期刊：Organic Letters, 页码：5393-5396 , 文章类型： 研究论文，,卷期：2008年10-23] New expeditious total syntheses of (S)-camptothecin (16% overall yield, 95% ee) and (S)-10-hydroxycamptothecin (14% overall yield, 99% ee) have been accomplished, resp., starting from readily available and inexpensive ma...