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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72条记录   Reversal of Nucleophilicity of Enamides in Water: Control of Cyclization Pathways by Reaction Media for the Orthogonal Synthesis of Dihydropyridinone and Pyrrolidinone Clausena Alkaloids. [作者：Yang, Luo;Zheng, Qi-Yu;Wang, De-Xian;Huang, Zhi-Tang;Wang, Mei-Xiang;,期刊：Organic Letters, 页码：2461-2464 , 文章类型： 研究论文，,卷期：2008年10-12] A highly efficient, metal-free, and divergent method for the synthesis of 3,4-dihydropyridin-2-one (e.g. I) and pyrrolidin-2-one (e.g. II) Clausena alkaloids and their analogs from oxirane emamides (e.g. III) is reported... Enantiocontrolled Synthesis of (-)-9-epi-Pentazocine and (-)-Aphanorphine. [作者：Yang, Xiaobao;Zhai, Hongbin;Li, Zhong;,期刊：Organic Letters, 页码：2457-2460 , 文章类型： 研究论文，,卷期：2008年10-12] We have developed novel asym. routes to (-)-9-epi-pentazocine (I) and (-)-aphanorphine (II) from a D-tyrosine deriv. The tricyclic frameworks of (-)-9-epi-pentazocine and (-)-aphanorphine were assembled stereoselectivel... Regio- and Chemoselective Multiple Functionalization of Pyrimidine Derivatives by Selective Magnesiations using TMPMgCl譒iCl. [作者：Mosrin, Marc;Knochel, Paul;,期刊：Organic Letters, 页码：2497-2500 , 文章类型： 研究论文，,卷期：2008年10-12] Successive regio- and chemoselective magnesiations of pyrimidines using TMPMgCl譒iCl furnish, after trapping with various electrophiles, highly functionalized derivs., e.g. I, in good to excellent yields. Applications to ... Chiral selector with multiple hydrogen-bonding sites in a macrocyclic cavity. [作者：Ema, Tadashi;Tanida, Daisuke;Sugita, Kyoko;Sakai, Takashi;Miyazawa, Ken-ichiro;Ohnishi, Atsushi;,期刊：Organic Letters, 页码：2365-2368 , 文章类型： 研究论文，,卷期：2008年10-12] Chiral macrocycles with the hydrogen bond donor/acceptor sites in the cavity were synthesized and covalently bonded to silica gel to give chiral stationary phases (CSPs), which showed excellent abilities to resolve vario... Supramolecular Multicomponent Self-Assembly of Shape-Adaptive Nanoprisms: Wrapping up C60 with Three Porphyrin Units. [作者：Schmittel, Michael;He, Bice;Mal, Prasenjit;,期刊：Organic Letters, 页码：2513-2516 , 文章类型： 研究论文，,卷期：2008年10-12] Self-assembly of a C3v sym. trisphenanthroline and linear bisterpyridines in the presence of Cu+ did not furnish the expected supramol. nanoprisms in quant. yield. With an accurately sized tripyridine as a stabilizing t... Vapor-Phase Processable Novel Nonplanar Donor-Acceptor Quateraryls for Blue OLEDs. [作者：Goel, Atul;Dixit, Manish;Chaurasia, Sumit;Kumar, Amit;Raghunandan, Resmi;Maulik, P. R.;Anand, R. S.;,期刊：Organic Letters, 页码：2553-2556 , 文章类型： 研究论文，,卷期：2008年10-12] Mass Spectroscopy and Other Related Properties) Section Thermally stable blue light emitting quateraryls with a piperidine donor and a nitrile acceptor were prepd. from a ketene-S,S-acetal under mild conditions without u... Fluorogenic and Chromogenic Rhodamine Spirolactam Based Probe for Nitric Oxide by Spiro Ring Opening Reaction. [作者：Zheng, Hong;Shang, Gui-Qin;Yang, Shi-Yao;Gao, Xia;Xu, Jin-Gou;,期刊：Organic Letters, 页码：2357-2360 , 文章类型： 研究论文，,卷期：2008年10-12] A new fluorogenic and chromogenic probe rhodamine B spirolactam (1) was developed that in aq. solns. exhibited a highly selective and sensitive turn-on type spectral response toward NO detection following a NO-induced sp... Anomalous photophysics of bis(hydroxystyryl)benzenes: a twist on the para/meta dichotomy. [作者：Solntsev, Kyril M.;McGrier, Psaras L.;Fahrni, Christoph J.;Tolbert, Laren M.;Bunz, Uwe H. F.;,期刊：Organic Letters, 页码：2429-2432 , 文章类型： 研究论文，,卷期：2008年10-12] Photographic and Other Reprographic Processes) Section The two isomeric bis(hydroxystyryl)benzenes HO-p-C6H4-CH=CH-C6H4-p-OH (I) and HO-m-C6H4-CH=CH-C6H4-m-OH (II) show dramatically different photophys. properties that a... Enantioselective Synthesis and Enantiomeric Amplification of Amino Acids under Prebiotic Conditions. [作者：Levine, Mindy;Kenesky, Craig Scott;Mazori, Daniel;Breslow, Ronald;,期刊：Organic Letters, 页码：2433-2436 , 文章类型： 研究论文，,卷期：2008年10-12] A plausible origin of biomol. homochirality is advanced, where a-Me amino acids found on meteorites transfer their chirality in the synthesis of normal amino acids. This asymmetry can be amplified to nearly homochiral l... Total Synthesis of Sanguiin H-5. [作者：Su, Xianbin;Surry, David S.;Spandl, Richard J.;Spring, David R.;,期刊：Organic Letters, 页码：2593-2596 , 文章类型： 研究论文，,卷期：2008年10-12] Using an atropdiastereoselective oxidative biaryl coupling as the key step, the total synthesis of the ellagitannin natural product sanguiin H-5 is reported. Both organomagnesium and organozinc based metalation methodol... Ainsliadimer A, a new sesquiterpene lactone dimer with an unusual carbon skeleton from Ainsliaea macrocephala. [作者：Wu, Zhi-Jun;Xu, Xi-Ke;Shen, Yun-Heng;Su, Juan;Tian, Jun-Mian;Liang, Shuang;Li, Hui-Liang;Liu, Rui-Hui;Zhang, Wei-Dong;,期刊：Organic Letters, 页码：2397-2400 , 文章类型： 研究论文，,卷期：2008年10-12] A phytochem. investigation of Ainsliaea macrocephala led to the isolation of a new dimeric sesquiterpene lactone, ainsliadimer A (I). The structure of I was elucidated by spectroscopic anal., and confirmed by single crys... Rate-Accelerating Effect by the Neighboring-Group Participation of Protecting Groups in the Dehydrative Cyclization of 1,3,5-Triketones. [作者：Sakakura, Akira;Watanabe, Hitoshi;Ishihara, Kazuaki;,期刊：Organic Letters, 页码：2569-2572 , 文章类型： 研究论文，,卷期：2008年10-12] Neighboring-group participation of an acyl protecting group efficiently promotes the Bronsted acid-catalyzed dehydrative cyclization of 1,3,5-triketones, e.g. (pivaloyloxy)trimethylnonanetrione I (R = Me3CCO), to g-pyron... Diastereoselective Synthesis of Tetrahydrofurans via Palladium(0)-Catalyzed [3 + 2] Cycloaddition of Vinylcyclopropanes and Aldehydes. [作者：Parsons, Andrew T.;Campbell, Matthew J.;Johnson, Jeffrey S.;,期刊：Organic Letters, 页码：2541-2544 , 文章类型： 研究论文，,卷期：2008年10-12] Palladium(0)-catalyzed cycloaddns. of malonate-derived vinylcyclopropane I and aldehydes to afford 2,5-cis disubstituted THF derivs. II (R = Ph, 4-ClC6H4, 2-O2NC6H4, n-C5H11, etc.) are described. Pd loadings as low as 0.... Total Synthesis of cis-Sylvaticin. [作者：Brown, Lynda J.;Spurr, Ian B.;Kemp, Stephen C.;Camp, Nicholas P.;Gibson, Karl R.;Brown, Richard C. D.;,期刊：Organic Letters, 页码：2489-2492 , 文章类型： 研究论文，,卷期：2008年10-12] An asym. total synthesis of (+)-cis-sylvaticin [I, X = (CH2)7, Y = (CH2)9] is described. Key steps include the use of permanganate-mediated oxidative cyclization of 1,5-dienes to synthesize the two major fragments II an... Total Synthesis of the Hsp90 Inhibitor Geldanamycin. [作者：Qin, Hua-Li;Panek, James S.;,期刊：Organic Letters, 页码：2477-2479 , 文章类型： 研究论文，,卷期：2008年10-12] An enantioselective synthesis of the Hsp90 inhibitor geldanamycin (I) was achieved in 20 linear steps and 2.0% overall yield from 2-methoxyhydroquinone. The synthesis is highlighted by a regio- and stereoselective hydro... Organocatalytic Asymmetric Tandem Michael-Henry Reactions: A Highly Stereoselective Synthesis of Multifunctionalized Cyclohexanes with Two Quaternary Stereocenters. [作者：Tan, Bin;Chua, Pei Juan;Li, Yongxin;Zhong, Guofu;,期刊：Organic Letters, 页码：2437-2440 , 文章类型： 研究论文，,卷期：2008年10-12] A novel organocatalytic asym. tandem Michael-Henry reaction catalyzed by 9-amino-9-deoxyepiquinine (I) was developed. The reaction was efficiently catalyzed by I to give highly functionalized cyclohexanes with four ster...