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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74条记录   Enzymatic Formation of Unnatural Novel Chalcone, Stilbene, and Benzophenone Scaffolds by Plant Type III Polyketide Synthase. [作者：Shi, She-Po;Wanibuchi, Kiyofumi;Morita, Hiroyuki;Endo, Kohei;Noguchi, Hiroshi;Abe, Ikuro;,期刊：Organic Letters, 页码：551-554 , 文章类型： 研究论文，,卷期：2009年11-3] plant-specific type III polyketide synthase (PKS). Remarkably, the C21 chalcone-forming activity was dramatically increased in a structure-guided OKS N222G mutant that produces a C20 decaketide SEK15 from 10 mols. of ma... Probing the lactose譍M3 carbohydrate-carbohydrate interaction with glycodendrimers. [作者：Seah, Nicole;Santacroce, Paul V.;Basu, Amit;,期刊：Organic Letters, 页码：559-562 , 文章类型： 研究论文，,卷期：2009年11-3] Multivalent glycoconjugates were prepd. using generation-4 PAMAM dendrimers, and their interaction with Langmuir monolayers contg. GM3 was investigated. Excessive carbohydrate valency adversely affects the carbohydrate-... A New Approach to Neuraminic Acid Analogs via 1,2-Oxazines. [作者：Bressel, Bettina;Reissig, Hans-Ulrich;,期刊：Organic Letters, 页码：527-530 , 文章类型： 研究论文，,卷期：2009年11-3] A new stereoselective and potentially very flexible (C5 + C3 + C1) approach to neuraminic acid derivs. and analogs, e.g. I, has been established using enantiopure nitrones and alkoxyallenes as C3 and C1 building blocks. ... Facile Synthesis of 2-O-Iodoacetyl Protected Glycosyl Iodides: Useful Precursors of 1 ?2-Linked 1,2-trans-Glycosides. [作者：Ko, Yoon-Joo;Shim, Seung-Bo;Shin, Jung-Hyu;,期刊：Organic Letters, 页码：609-612 , 文章类型： 研究论文，,卷期：2009年11-3] The prepn. and utilization of novel iodide glycosyl donors, 2-O-iodoacetyl-glycopyranosyl iodides, is described. The mechanism for the reaction of iodine with carbohydrate cyclic ketene acetal was investigated through l... Practical Synthesis of 3b-Amino-5-cholestene and Related 3b-Halides Involving i-Steroid and Retro-i-Steroid Rearrangements. [作者：Sun, Qi;Cai, Sutang;Peterson, Blake R.;,期刊：Organic Letters, 页码：567-570 , 文章类型： 研究论文，,卷期：2009年11-3] Derivs. of 3b-amino-5-cholestene (3b-cholesterylamine) are of substantial interest as cellular probes and have potential medicinal applications. However, existing syntheses of 3b-amino-5-cholestene are of limited prepar... Asymmetric Construction of Quaternary Carbon Centers by Sequential Conjugate Addition of Lithium Amide and in Situ Alkylation: Utility in the Synthesis of (-)-Aspidospermidine. [作者：Suzuki, Mayuko;Kawamoto, Yoshito;Sakai, Takeo;Yamamoto, Yasutomo;Tomioka, Kiyoshi;,期刊：Organic Letters, 页码：653-655 , 文章类型： 研究论文，,卷期：2009年11-3] Chiral diether ligand-controlled asym. conjugate addn. of a lithium amide to cyclopentenecarboxylate and subsequent in situ alkylation gave a chiral cyclopentane deriv. bearing a quaternary carbon with high enantio- and ... Total synthesis of (?-hasubanonine. [作者：Jones, Spencer B.;He, Liwen;Castle, Steven L.;,期刊：Organic Letters, 页码：785-785 , 文章类型： 研究论文，,卷期：2009年11-3] On page 3759, in Scheme 4, the product of the reaction was detd. to be rearranged isomer 17 as opposed to hasubanonine 1. Compd. 17 should be removed from Scheme 3 and Scheme 5 should be retracted along with the paragra... A Guanidinium Ion-Based Anion- and Solvent Polarity-Controllable Molecular Switch. [作者：Lin, Tzu-Chiun;Lai, Chien-Chen;Chiu, Sheng-Hsien;,期刊：Organic Letters, 页码：613-616 , 文章类型： 研究论文，,卷期：2009年11-3] The macrocycle bis-p-xylyl[26]crown-6 (BPX26C6) is capable of complexing guanidinium ions in a [2]pseudorotaxane-like manner in soln. A corresponding mol. switch can be operated through changes in solvent polarity or th... PQS: A New Platform for Micellar Catalysis. RCM Reactions in Water, with Catalyst Recycling. [作者：Lipshutz, Bruce H.;Ghorai, Subir;,期刊：Organic Letters, 页码：705-708 , 文章类型： 研究论文，,卷期：2009年11-3] Amphiphilic ruthenium carbenes I [R = Me(OCH2CH2)n; R1 = all-(E)-Me2C:CHCH2(CH2CMe:CHCH2)9; R2 = Me, R1; R3 = R1, Me; Cy = cyclohexyl], derived from dihydro coenzyme Q10, is prepd.; the regioisomers of I function as recy... Total Synthesis of Pseudodehydrothyrsiferol. [作者：Hioki, Hideaki;Motosue, Masatoshi;Mizutani, Yasuhiko;Noda, Akira;Shimoda, Tomoaki;Kubo, Miwa;Harada, Kenichi;Fukuyama, Yoshiyasu;Kodama, Mitsuaki;,期刊：Organic Letters, 页码：579-582 , 文章类型： 研究论文，,卷期：2009年11-3] An enantioselective total synthesis of pseudodehydrothyrsiferol (I) has been accomplished. The synthetic sequence highlights formation of the highly strained tetrahydropyran C-ring by a Mitsunobu-type SN2 reaction with ... Skeletal and Stereochemical Diversification of Tricyclic Frameworks Inspired by Ca2+-ATPase Inhibitors, Artemisinin and Transtaganolide D. [作者：Oguri, Hiroki;Yamagishi, Yutaka;Hiruma, Takahisa;Oikawa, Hideaki;,期刊：Organic Letters, 页码：601-604 , 文章类型： 研究论文，,卷期：2009年11-3] with the three-dimensional structural diversity of tricyclic systems were designed and expeditiously synthesized (4-5 steps). A synthetic strategy featuring stereochem. diversification of ring-junctions and control of c... Si-Based Benzylic 1,4-Rearrangement/Cyclization Reaction. [作者：Trost, Barry M.;Bertogg, Andreas;,期刊：Organic Letters, 页码：511-513 , 文章类型： 研究论文，,卷期：2009年11-3] The trans-selective hydrosilylation of ynones yields b-silylated enones that undergo a benzylic 1,4-rearrangement/cyclization reaction in the presence of base, yielding 2,5-dihydro-1,2-oxasiloles, e.g. 95 % 5-ethyl-3-(fu... Regiocontrolled Cobalt-Catalyzed Diels-Alder Reactions of Silicon-Functionalized, Terminal, and Internal Alkynes. [作者：Hilt, Gerhard;Janikowski, Judith;,期刊：Organic Letters, 页码：773-776 , 文章类型： 研究论文，,卷期：2009年11-3] The efficient control of the regiochem. of the Diels-Alder adducts (isolated as substituted benzenes after oxidn. by DDQ), which are formed in excellent yields from 2-methyl-1,3-butadiene and alkynylsilanes, can be reali... Asymmetric Bisboranes as Bidentate Catalysts for Carbonyl Substrates. [作者：Rodriguez, Andrew A.;Zhao, Carrie;Shea, Kenneth J.;,期刊：Organic Letters, 页码：713-715 , 文章类型： 研究论文，,卷期：2009年11-3] A new class of C2 sym. bisoxazaborolidinone compds. I is prepd. from reaction of bis-Valine N,N-sulfone with phenyldichloroborane and which exhibits bidentate binding to carbonyl substrates. Using the Diels-Alder reacti... Synthesis of 3-Hydroxypyridines Using Ruthenium-Catalyzed Ring-Closing Olefin Metathesis. [作者：Yoshida, Kazuhiro;Kawagoe, Fumihiro;Hayashi, Kazushi;Horiuchi, Shingo;Imamoto, Tsuneo;Yanagisawa, Akira;,期刊：Organic Letters, 页码：515-518 , 文章类型： 研究论文，,卷期：2009年11-3] New synthetic routes to substituted 3-hydroxypyridines are presented. Ring-closing olefin metathesis (RCM)/elimination and RCM/oxidn./deprotection of nitrogen-contg. dienes are the key processes of the routes. An applic... Synthesis of Chromans via [3 + 3] Cyclocoupling of Phenols with Allylic Alcohols Using a Mo/o-Chloranil Catalyst System. [作者：Yamamoto, Yoshihiko;Itonaga, Kouhei;,期刊：Organic Letters, 页码：717-720 , 文章类型： 研究论文，,卷期：2009年11-3] The combination of a molybdenum complex (CpMoCl(CO)3 or [CpMo(CO)3]2) and o-chloranil was used as a catalyst in the [3+3] cyclocoupling of phenols and allylic alcs. under microwave heating conditions. Substituted chroma...