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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69条记录   Preparation of a Functionalized Tetracyclic Intermediate for the Synthesis of Rhodexin A. [作者：Jung, Michael E.;Chu, Hiufung V.;,期刊：Organic Letters, 页码：3647-3649 , 文章类型： 研究论文，,卷期：2008年10-16] An efficient synthesis of the tetracyclic steroid core I of rhodexin A and sarmentogenin is reported. An initial inverse-electron-demand Diels-Alder reaction of an acyldiene with a silyl enol ether gave the cycloadduct ... Syntheses and Biological Evaluation of B-Ring-Modified Analogues of Dafachronic Acid A. [作者：Giroux, Simon;Bethke, Axel;Fielenbach, Nicole;Antebi, Adam;Corey, E. J.;,期刊：Organic Letters, 页码：3643-3645 , 文章类型： 研究论文，,卷期：2008年10-16] derivs. II and I (R = H) have revealed that I (R2 = bond), and not a further oxidn. product, is the natural ligand for the DAF-12 receptor of Caenorhabditis elegans. Flexible Strategy for the Synthesis of Pyrrolizidine Alkaloids. [作者：Donohoe, Timothy J.;Thomas, Rhian E.;Cheeseman, Matthew D.;Rigby, Caroline L.;Bhalay, Gurdip;Linney, Ian D.;,期刊：Organic Letters, 页码：3615-3618 , 文章类型： 研究论文，,卷期：2008年10-16] A general strategy for the prodn. of pyrrolizidine alkaloids is described, starting from pyrroline intermediate (+)-I. The key features are diastereoselective dihydroxylation, inversion at the ring junction by hydrobora... Total Synthesis of Aristolactams via a One-Pot Suzuki-Miyaura Coupling/Aldol Condensation Cascade Reaction. [作者：Kim, Joa Kyum;Kim, Young Ha;Nam, Ho Tae;Kim, Bum Tae;Heo, Jung-Nyoung;,期刊：Organic Letters, 页码：3543-3546 , 文章类型： 研究论文，,卷期：2008年10-16] A direct one-pot synthesis of phenanthrene lactams, which employs a Suzuki-Miyaura coupling/aldol condensation cascade reaction of isoindolin-1-one with 2-formylphenylboronic acid, has been developed. The approach is use... A Versatile Cyclodehydration Reaction for the Synthesis of Isoquinoline and b-Carboline Derivatives. [作者：Movassaghi, Mohammad;Hill, Matthew D.;,期刊：Organic Letters, 页码：3485-3488 , 文章类型： 研究论文，,卷期：2008年10-16] The direct conversion of various amides to isoquinoline and b-carboline derivs. via mild electrophilic amide activation, with trifluoromethanesulfonic anhydride in the presence of 2-chloropyridine, is described. Low-tem... Consecutive Cyclization of Allylaminoalkene by Intramolecular Aminolithiation-Carbolithiation. [作者：Tsuchida, Susumu;Kaneshige, Atsunori;Ogata, Tokutaro;Baba, Hiromi;Yamamoto, Yasutomo;Tomioka, Kiyoshi;,期刊：Organic Letters, 页码：3635-3638 , 文章类型： 研究论文，,卷期：2008年10-16] Consecutive cyclization of allylaminoalkenes, e.g. I, by tandem aminolithiation-carbolithiation proceeded smoothly by using a lithium amide as a lithiating agent as well as protonating agent to give bicyclic amines II (R... a-Pyridylation of chiral amines via urea coupling, lithiation and rearrangement. [作者：Clayden, Jonathan;Hennecke, Ulrich;,期刊：Organic Letters, 页码：3567-3570 , 文章类型： 研究论文，,卷期：2008年10-16] Bromo-substituted pyridines, along with other brominated electron-deficient arenes, undergo palladium-catalyzed coupling with ureas of structure RNMeCONHMe. Where R is a chiral, a-substituted benzyl group, treatment wit... Magnesium Nitride as a Convenient Source of Ammonia: Preparation of Dihydropyridines. [作者：Bridgwood, Katy L.;Veitch, Gemma E.;Ley, Steven V.;,期刊：Organic Letters, 页码：3627-3629 , 文章类型： 研究论文，,卷期：2008年10-16] Magnesium nitride (Mg3N2) has been investigated for the prepn. of dihydropyridines. This is a com. available, bench-stable solid that generates ammonia upon treatment with protic solvents. E.g., reaction of Et acetoace... Organocatalytic Stereoselective Mannich Reaction of 3-Substituted Oxindoles. [作者：Tian, Xu;Jiang, Kun;Peng, Jing;Du, Wei;Chen, Ying-Chun;,期刊：Organic Letters, 页码：3583-3586 , 文章类型： 研究论文，,卷期：2008年10-16] The asym. Mannich reaction of 3-substituted oxindoles, e.g. I (R = PhCH2, 4-FC6H4, Pr, etc.), and N-Boc imines, e.g. R1CH:NBoc (R1 = Ph, 2-thienyl, iso-Pr, etc.), was investigated for the first time, employing bifunction... Highly Electron-Donating 3,3'-Diaryl-1,1'-bi(isobenzofuran)s Synthesized by Photochemical Exocyclic [2 + 2 + 2] Cycloaddition. [作者：Zhang, Hongyu;Wakamiya, Atsushi;Yamaguchi, Shigehiro;,期刊：Organic Letters, 页码：3591-3594 , 文章类型： 研究论文，,卷期：2008年10-16] Facile photochem. exocyclic [2 + 2 + 2] cycloaddn. produced a series of electron-donating 1,1'-bi(isobenzofuran)s I [Ar = Ph, 3,5-(MeO)2C6H3, 2-thenyl, 4-pyridyl, etc.] having various aryl groups at the 3,3' positions. T... Total Synthesis of GEX1A. [作者：Murray, Timothy J.;Forsyth, Craig J.;,期刊：Organic Letters, 页码：3429-3431 , 文章类型： 研究论文，,卷期：2008年10-16] An efficient and readily modifiable synthesis of GEX1A/herboxidiene/TAN-1609 (I) was developed. This modular synthesis featured a Suzuki coupling to install the conjugated diene and a Ru-catalyzed lactonization and Rous... Magnesium Nitride as a Convenient Source of Ammonia: Preparation of Primary Amides. [作者：Veitch, Gemma E.;Bridgwood, Katy L.;Ley, Steven V.;,期刊：Organic Letters, 页码：3623-3625 , 文章类型： 研究论文，,卷期：2008年10-16] The use of magnesium nitride (Mg3N2) as a convenient source of ammonia has been explored for the direct transformation of esters to primary amides. Me, Et, iso-Pr, and tert-Bu esters are converted to the corresponding c... p-Stacking Effect on Levoglucosenone Derived Internal Chiral Auxiliaries. A Case of Complete Enantioselectivity Inversion on the Diels-Alder Reaction. [作者：Sarotti, Ariel M.;Fernandez, Israel;Spanevello, Rolando A.;Sierra, Miguel A.;Suarez, Alejandra G.;,期刊：Organic Letters, 页码：3389-3392 , 文章类型： 研究论文，,卷期：2008年10-16] Detailed quantum chem. calcns., exptl. evidence, and NMR data rationalize the participation of p-stacking interaction in the highly asym. Diels-Alder reaction using levoglucosenone derived internal chiral auxiliaries, in... A Straightforward Synthesis of Tetrameric Estrone-Based Macrocycles. [作者：Ramirez-Lopez, Pedro;de la Torre, Maria C.;Montenegro, Hector E.;Asenjo, Maria;Sierra, Miguel A.;,期刊：Organic Letters, 页码：3555-3558 , 文章类型： 研究论文，,卷期：2008年10-16] A straightforward approach to macrocycles having four estrone-derived nuclei by the sequential Cu-catalyzed Huisgen azide-alkyne cycloaddn.-Glaser-Eglington Cu homocoupling has been developed. Due to its efficiency and s... Pd-Catalyzed borylative polycyclization of enediynes to allylboronates. [作者：Marco-Martinez, Juan;Bunuel, Elena;Munoz-Rodriguez, Rebeca;Cardenas, Diego J.;,期刊：Organic Letters, 页码：3619-3621 , 文章类型： 研究论文，,卷期：2008年10-16] Pd-catalyzed double cyclization of 6-ene-1,11-diynes (6Z)- or (6E)-RCYCCH2CX2CH2CH:CHCH2CX2CH2CYCR1 (1) with bis(pinacolato)diboron affords synthetically useful cyclic allylboronates I under smooth conditions. Two new C... "Lock and Key Control" of Photochromic Reactivity by Controlling the Oxidation/Reduction State. [作者：Li, Xiaochuan;Ma, Yuzhen;Wang, Bingcai;Li, Gongan;,期刊：Organic Letters, 页码：3639-3642 , 文章类型： 研究论文，,卷期：2008年10-16] A photochem. active triangle terarylene was synthesized and the photochromic behavior was investigated. Its photochromic reactivity can be strongly suppressed by selected oxidization of the sulfur atoms in the mols. Re...