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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   (S,S)-(+)-Pseudoephedrine a-Iminoglyoxylamide as a Chiral Glycine Cation Equivalent: A Modular and Flexible Approach to Enantioenriched a-Amino Ketones. [作者：Ruiz, Nerea;Vicario, Jose L.;Badia, Dolores;Carrillo, Luisa;Alonso, Beatriz;,期刊：Organic Letters, 页码：2613-2616 , 文章类型： 研究论文，,卷期：2008年10-12] We have studied the ability of an a-imino glyoxylamide derived from (S,S)-(+)-pseudoephedrine as a valuable chiral electrophile for the prepn. of a-amino carbonyl compds. In this context, the addn. of Grignard reagents ... Conformational Effects in Acid-Mediated Ring Opening of Epoxides: A Prominent Role of the Oxirane Walsh Orbital. [作者：Oshima, Takumi;Asahara, Haruyasu;Kubo, Emi;Miyamoto, Saki;Togaya, Kyoko;,期刊：Organic Letters, 页码：2413-2416 , 文章类型： 研究论文，,卷期：2008年10-12] A kinetic study has been made of the BF3-mediated ring opening of two rigid conformers (a and b) of m- and p-dimethyl-substituted homobenzoquinone epoxides spiro-linked with a twist-boat dibenzocycloheptene ring as compa... Exiguaquinol: A Novel Pentacyclic Hydroquinone from Neopetrosia exigua that Inhibits Helicobacter pylori MurI. [作者：de Almeida Leone, Priscila;Carroll, Anthony R.;Towerzey, Leanne;King, Gordon;McArdle, Bernadette M.;Kern, Gunther;Fisher, Stewart;Hooper, John N. A.;Quinn, Ronald J.;,期刊：Organic Letters, 页码：2585-2588 , 文章类型： 研究论文，,卷期：2008年10-12] sponge Neopetrosia exigua led to the isolation of exiguaquinol (I), a new pentacyclic hydroquinone that inhibited Helicobacter pylori glutamate racemase (MurI) with an IC50 of 4.4 mM. Its structure and relative configur... Segment Block Dendrimers via Diels-Alder Cycloaddition. [作者：Kose, M. Merve;Yesilbag, Gulen;Sanyal, Amitav;,期刊：Organic Letters, 页码：2353-2356 , 文章类型： 研究论文，,卷期：2008年10-12] Segment block dendrimers consisting of polyester and polyaryl ether dendrons were synthesized using reagent free Diels-Alder cycloaddn. reactions. Three generations of furan functionalized polyaryl ether dendrons were r... Synthesis of dehydro-b-amino esters via highly regioselective amination of allylic carbonates. [作者：Benfatti, Fides;Cardillo, Giuliana;Gentilucci, Luca;Mosconi, Elisa;Tolomelli, Alessandra;,期刊：Organic Letters, 页码：2425-2428 , 文章类型： 研究论文，,卷期：2008年10-12] The allylic amination of acetates and carbonates affords dehydro-b-aminoesters, which are useful precursors of biol. active compds. The uncatalyzed reaction proceeds via a SN2' mechanism. On the other hand, under pallad... A Direct Stereoselective Approach to trans-2,3-Disubstituted Piperidines: Application in the Synthesis of 2-Epi-CP-99,994 and (+)-Epilupinine. [作者：Ahari, M'hamed;Perez, Amandine;Menant, Christine;Vasse, Jean-Luc;Szymoniak, Jan;,期刊：Organic Letters, 页码：2473-2476 , 文章类型： 研究论文，,卷期：2008年10-12] described, offering a straightforward access to the trans-2,3-disubstituted piperidine skeleton which is present in a broad range of biol. active compds. The direct stereoselective approach to trans-2,3-disubstituted pi... Stereoselective Total Syntheses of Uncommon Sesquiterpenoids Isolated from Jatropha neopauciflora. [作者：Hayashi, Yujiro;Miyakoshi, Naoki;Kitagaki, Shinji;Mukai, Chisato;,期刊：Organic Letters, 页码：2385-2388 , 文章类型： 研究论文，,卷期：2008年10-12] The first total syntheses of two tricyclic sesquiterpenes I (R = H) and I (R = COMe), isolated from Jatropha neopauciflora, were completed from di-Me D-tartrate in a stereoselective manner. The crucial steps in these sy... Silaborations of 1,3-Enynes - Substrate Controlled Allene/1,3-Diene Selectivity. [作者：Lueken, Christian;Moberg, Christina;,期刊：Organic Letters, 页码：2505-2508 , 文章类型： 研究论文，,卷期：2008年10-12] Silaboration of 1,3-enynes catalyzed by group 10 metal complexes affords 1,3-dienes with vinylborane and vinylsilane functions or 1,2-dienes with allylborane and vinylsilane functions. Thus, Pd(acac)2/PEt3 catalyzed sil... Synthesis of Large Macrocyclic Azacalix[n]pyridines (n = 6 - 9) and Their Complexation with Fullerenes C60 and C70. [作者：Zhang, En-Xuan;Wang, De-Xian;Zheng, Qi-Yu;Wang, Mei-Xiang;,期刊：Organic Letters, 页码：2565-2568 , 文章类型： 研究论文，,卷期：2008年10-12] Large methylazacalix[n]pyridines (n = 6-9) were synthesized effectively from the Pd-catalyzed macrocyclic fragment coupling reactions between a,w-dibrominated and a,w-diaminated linear oligomers. As macrocyclic host mol... Catalytic aza-Wittig Cyclizations for Heteroaromatic Synthesis. [作者：Marsden, Stephen P.;McGonagle, Alison E.;McKeever-Abbas, Ben;,期刊：Organic Letters, 页码：2589-2591 , 文章类型： 研究论文，,卷期：2008年10-12] The first examples of heterocycle synthesis by iminophosphorane formation/intramol. aza-Wittig cyclizations that are catalytic in the organophosphorus component are reported. The reaction has been demonstrated in the sy... A Preparation of Enantiomerically Enriched Axially Chiral b-Diketimines: Synthesis of (-)- and (+)-IAN Amine. [作者：Luesse, Sarah B.;Counceller, Carla M.;Wilt, Jeremy C.;Perkins, Brittany R.;Johnston, Jeffrey N.;,期刊：Organic Letters, 页码：2445-2447 , 文章类型： 研究论文，,卷期：2008年10-12] The prepn. of an enantiomerically enriched b-diketimine I composed of isoquinoline and 2-aminonaphthalene (IAN amine) is described, thereby offering new opportunities in the synthesis of nonracemic b-diketimine- and pyri... One-Pot Syntheses of 2,3-Dihydrothiopyran-4-one Derivatives by Pd/Cu-Catalyzed Reactions of a,b-Unsaturated Thioesters with Propargyl Alcohols. [作者：Minami, Yasunori;Kuniyasu, Hitoshi;Kambe, Nobuaki;,期刊：Organic Letters, 页码：2469-2472 , 文章类型： 研究论文，,卷期：2008年10-12] 2,3-Dihydrothiopyran-4-one derivs. were readily prepd. by Pd/Cu-catalyzed reactions between a,b-unsatd. thioesters and propargyl alcs. in the presence of bases. E.g., in presence of PdCl2, CuI, and K2CO3, cyclization of... Enantioselective Assembly of Substituted Dihydropyrones via Organocatalytic Reaction in Water Media. [作者：Wang, Jing;Yu, Fang;Zhang, Xiaojing;Ma, Dawei;,期刊：Organic Letters, 页码：2561-2564 , 文章类型： 研究论文，,卷期：2008年10-12] The diarylprolinol ether/AcOH-catalyzed cascade Michael addn. and cyclization of aldehydes and a-keto-a,b-unsatd. esters proceeds smoothly in water to afford cyclic hemiacetals, e.g. I [R = H2C:CH(CH2)6CH2, PhCH2OCH2CH2,... Synthesis of the C1-C23 Fragment of Spirastrellolide A. [作者：Yang, Jin-Haek;Liu, Jia;Hsung, Richard P.;,期刊：Organic Letters, 页码：2525-2528 , 文章类型： 研究论文，,卷期：2008年10-12] Synthesis of the C1-C23 fragment I in spirastrellolide A is described, featuring a cyclic acetal-tethered RCM for stereoselective constructions of spiroketal, and a 1,3-anti aldol involving Me ketone enolate and Mukaiyam... An Efficient Strategy for the Synthesis of Endocyclic Enol Ethers and Its Application to the Synthesis of Spiroacetals. [作者：Fuwa, Haruhiko;Sasaki, Makoto;,期刊：Organic Letters, 页码：2549-2552 , 文章类型： 研究论文，,卷期：2008年10-12] An efficient strategy for the synthesis of endocyclic enol ethers based on a Suzuki-Miyaura coupling/ring-closing metathesis sequence has been developed. The strategy has successfully been applied to the synthesis of sp... Sequential Ni-Catalyzed Borylation and Cross-Coupling of Aryl Halides via in Situ Prepared Neopentylglycolborane. [作者：Rosen, Brad M.;Huang, Chenghong;Percec, Virgil;,期刊：Organic Letters, 页码：2597-2600 , 文章类型： 研究论文，,卷期：2008年10-12] A procedure for NiCl2(dppp)-catalyzed pinacolborylation and neopentylglycolborylation that utilizes in situ prepd. inexpensive pinacolborane and neopentylglycolborane is reported. The scope of this reaction was demonstr...