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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61条记录   Synthetic Studies Toward Pectenotoxin 2. Part I. Stereocontrolled Access to the C10-C22 Fragment. [作者：Aho, Jatta E.;Salomaki, Elina;Rissanen, Kari;Pihko, Petri M.;,期刊：Organic Letters, 页码：4179-4182 , 文章类型： 研究论文，,卷期：2008年10-19] A highly stereocontrolled and efficient synthesis for a fully functionalized C10-C22 fragment I of pectenotoxin 2 is described using a convergent sequence involving a stereoselective methylation of b-hydroxyketone as a k... Synthetic Studies Toward Pectenotoxin 2. Part II. Synthesis of the CDE and CDEF Ring Systems. [作者：Helmboldt, Hannes;Aho, Jatta E.;Pihko, Petri M.;,期刊：Organic Letters, 页码：4183-4185 , 文章类型： 研究论文，,卷期：2008年10-19] A convergent synthesis of the CDE I and CDEF II ring systems of pectenotoxin-2 from C and F ring precursors is described. Gram-Scale Synthesis of (+)-Spongistatin 1: Development of An Improved, Scalable Synthesis of the F-Ring Subunit, Fragment Union, and Final Elaboration. [作者：Smith, Amos B., III;Tomioka, Takashi;Risatti, Christina A.;Sperry, Jeffrey B.;Sfouggatakis, Chris;,期刊：Organic Letters, 页码：4359-4362 , 文章类型： 研究论文，,卷期：2008年10-19] In a quest to develop an effective, scalable synthesis of (+)-spongistatin 1 (I), we devised a concise, third-generation scalable synthesis of II, the requisite F-ring tetrahydropyran aldehyde, employing a proline-cataly... Stereoselective Synthesis of the Rocaglamide Skeleton via a Silyl Vinylketene Formation/[4 + 1] Annulation Sequence. [作者：Giese, Matthew W.;Moser, William H.;,期刊：Organic Letters, 页码：4215-4218 , 文章类型： 研究论文，,卷期：2008年10-19] The tricyclic core I of the cyclopentabenzofurans has been prepd. in an efficient and stereoselective manner utilizing an intramol. silyl vinylketene formation/[4 + 1] annulation sequence. This novel approach affords th... Spirastrellolide B: The Synthesis of Southern (C9-C25) Region. [作者：Chandrasekhar, Srivari;Rambabu, Chegondi;Reddy, Annareddy Syamprasad;,期刊：Organic Letters, 页码：4355-4357 , 文章类型： 研究论文，,卷期：2008年10-19] A combination of "chiron" and "asym." approaches is utilized to construct the southern (C9-C25) region I of marine natural product spirastrellolide B. The key functionalities are derived from D-glucose and Sharpless asy... Total Synthesis of Salinosporamide A. [作者：Fukuda, Takeo;Sugiyama, Kouhei;Arima, Shiho;Harigaya, Yoshihiro;Nagamitsu, Tohru;Omura, Satoshi;,期刊：Organic Letters, 页码：4239-4242 , 文章类型： 研究论文，,卷期：2008年10-19] The total synthesis of salinosporamide A (I) has been achieved through enzymic desymmetrization, diastereoselective aldol reaction, intramol. aldol reaction, and intermol. Reformatsky-type reaction followed by 1,4-redn. ... Synthesis of the C10-C32 Core Structure of Spirangien A. [作者：Lorenz, Michael;Kalesse, Markus;,期刊：Organic Letters, 页码：4371-4374 , 文章类型： 研究论文，,卷期：2008年10-19] The synthesis of the C10-C32 core structure I of spirangien A is reported. The pivotal aldol coupling between both key intermediates provides a synthetic challenge in the synthesis of this complex natural product. Efficient and Stereoselective Synthesis of Yellow Scale Pheromone via Alkyne Haloboration, Zr-Catalyzed Asymmetric Carboalumination of Alkenes (ZACA Reaction), and Pd-Catalyzed Tandem Negishi Coupling. [作者：Xu, Zhaoqing;Negishi, Ei-ichi;,期刊：Organic Letters, 页码：4311-4314 , 文章类型： 研究论文，,卷期：2008年10-19] A Pd-catalyzed reaction of allylzincs with the 1-octyne bromoboration product gives the desired allyl-alkenyl coupling products in good yields except with H2C=CHCH2ZnBr. This reaction is suitable for converting an alkyn... Nonracemic Diarylmethanols From CuH-Catalyzed Hydrosilylation of Diaryl Ketones. [作者：Lee, Ching-Tien;Lipshutz, Bruce H.;,期刊：Organic Letters, 页码：4187-4190 , 文章类型： 研究论文，,卷期：2008年10-19] An efficient method for the synthesis of nonracemic diarylmethanols, e.g. I, has been developed. The use of (R)-(-)-(DTBM-SEGPHOS)CuH effects highly enantioselective 1,2-hydrosilylation of prochiral diaryl ketones. A Simple, Cost-Effective Method for the Regioselective Deuteration of Anilines. [作者：Martins, Andrew;Lautens, Mark;,期刊：Organic Letters, 页码：4351-4353 , 文章类型： 研究论文，,卷期：2008年10-19] 27 A highly effective and operationally simple method for the regioselective deuteration of anilines is presented. A variety of electron-rich and electron-deficient anilines are efficiently deuterated at the ortho and/o... Palladium-catalyzed C-allylation of benzoins and an NHC-catalyzed three component coupling derived thereof: compatibility of NHC- and Pd-catalysts. [作者：Lebeuf, Raphael;Hirano, Keiichi;Glorius, Frank;,期刊：Organic Letters, 页码：4243-4246 , 文章类型： 研究论文，,卷期：2008年10-19] A large range of benzoins was successfully applied as C-nucleophiles in the palladium-catalyzed allylic alkylation with several allyl acetates, resulting in functionalized tertiary homoallylic alcs. A no. of unsym. benz... Simple Chiral Diene Ligands Provide High Enantioselectivities in Transition-Metal-Catalyzed Conjugate Addition Reactions. [作者：Okamoto, Kazuhiro;Hayashi, Tamio;Rawal, Viresh H.;,期刊：Organic Letters, 页码：4387-4389 , 文章类型： 研究论文，,卷期：2008年10-19] Chiral dienes possessing the bicyclo[2.2.2]octadiene framework were prepd. readily through the [4 + 2] cycloaddn. of (R)-a-phellandrene with Me propiolate as the key step. Diene I, substituted with a tertiary alc. on on... Two-step stereocontrolled synthesis of densely functionalized cyclic b-aminoesters containing four stereocenters, based on a new cerium(IV) ammonium nitrate catalyzed sequential three-component reaction. [作者：Sridharan, Vellaisamy;Menendez, J. Carlos;,期刊：Organic Letters, 页码：4303-4306 , 文章类型： 研究论文，,卷期：2008年10-19] reaction between alkylamines, b-ketoesters, and chalcones afforded cis-4,6-disubstituted 2-alkylaminocyclohexene-1-carboxylic esters with complete diastereoselectivity. The carbon-carbon double bond of these compds. was... N-Heterocyclic Carbene-Catalyzed Oxidation of Unactivated Aldehydes to Esters. [作者：Maki, Brooks E.;Scheidt, Karl A.;,期刊：Organic Letters, 页码：4331-4334 , 文章类型： 研究论文，,卷期：2008年10-19] to esters with manganese(IV) oxide in excellent yield. The reaction proceeds through a transient activated alc., which when generated in situ allows for the selective oxidn. of the aldehyde under mild conditions. These... Copper + Nickel-in-Charcoal (Cu-Ni/C): A Bimetallic, Heterogeneous Catalyst for Cross-Couplings. [作者：Lipshutz, Bruce H.;Nihan, Danielle M.;Vinogradova, Ekaterina;Taft, Benjamin R.;Boskovic, Zarko V.;,期刊：Organic Letters, 页码：4279-4282 , 文章类型： 研究论文，,卷期：2008年10-19] A new heterogeneous catalyst composed of copper and nickel oxide particles supported within charcoal has been developed. It catalyzes cross-couplings that traditionally use palladium, nickel, or copper, including Suzuki... Scandium-Catalyzed Carbon-Carbon Bond-Forming Reactions of 3-Sulfanyl- and 3-Selanylpropargyl Alcohols. [作者：Yoshimatsu, Mitsuhiro;Otani, Tokutaro;Matsuda, Saki;Yamamoto, Teruhisa;Sawa, Arisa;,期刊：Organic Letters, 页码：4251-4254 , 文章类型： 研究论文，,卷期：2008年10-19] The scandium-catalyzed substitution reactions of the phenylsulfanyl and phenylselanyl propargyl alcs., e.g. Me3CCH(OH)CYCXPh (X = S, Se), regioselectively proceeded to give the propargylated compds., e.g. I (X = S, Se), ...