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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21条记录   Reactivity and Selectivity of Captodative Olefins as Dienes in Hetero-Diels - Alder Reactions [作者：Sanabria, R; Herrera, R; Aguilar, R; Gonzalez-Romero, C; Jimenez-Vazquez, HA; Delgado, F; Soderberg, BCG; Tamariz, J,期刊：Helvetica Chimica Acta, 页码：1807-1827 , 文章类型： Article，,卷期：2008年91-10] The reactivity and selectivity of the the captodative olefins 1-acylvinyl benzoates 1a-1f and 3a as heterodienes in hetero-Diels-Alder reactions in the presence of electron-rich dienophiles is described. Heterodienes 1 u... Formal Synthesis of Olivacine via Indolylborate [作者：Ishikura, M; Takahashi, N; Yamada, K; Abe, T; Yanada, R,期刊：Helvetica Chimica Acta, 页码：1828-1837 , 文章类型： Article，,卷期：2008年91-10] Palladium-catalyzed tandem cyclization - cross-coupling reaction of indolylborate 2 and vinyl bromide 5 was successfully applied in a short formal synthesis of olivacine. The reaction of 2 with 5 in the presence of Pd(OA... Synthesis of 1,2,3-Triazole Analogues of Lincomycin [作者：Collin, MP; Hobbie, SN; Bottger, EC; Vasella, A,期刊：Helvetica Chimica Acta, 页码：1838-1848 , 文章类型： Article，,卷期：2008年91-10] In search for ne v antibiotics we replaced the amide moiety of lincomycin I by a 1,23-triazole ring. The 1.2,3-triazoles 10a-10k were obtained as single regioisomers by 'click reaction' of azide 5 with the alkyne 9k, der... Synthesis of Derivatives of the Optically Active beta-Amino Acids from (+)-Car-2-ene [作者：Koneva, EA; Volcho, KP; Gatilov, YV; Korchagina, DV; Salnikov, GE; Salakhutdinov, NF,期刊：Helvetica Chimica Acta, 页码：1849-1856 , 文章类型： Article，,卷期：2008年91-10] The reaction of (+)-car-2-ene (4) with chlorosulfonyl isocyanate (=sulfuryl chloride isocyanate; CISO2NCO) led to the tricyclic lactams 6 and 8 corresponding to the initial formation both of the tertiary carbenium and al... Monohydroxy-Substituted Polyunsaturated Fatty Acids from Swertia japonica [作者：Kikuchi, M; Yaoita, Y; Kiknchi, M,期刊：Helvetica Chimica Acta, 页码：1857-1862 , 文章类型： Article，,卷期：2008年91-10] Fourteen monohydroxy-substituted polyunsaturated fatty acids, including two new compounds. (9Z,12S,13E,15Z)-12-hydroxyoetadeca-9,13,15-trienoic acid (10) and (9Z,12Z,14E,16R)-16-hydroxyoctadeca-9,12,14-trienoic acid acid... New Antioxidant Phenolic Glucosides from Viburnum dilatatum [作者：Wu, B; Wu, SW; Qu, HB; Cheng, YY,期刊：Helvetica Chimica Acta, 页码：1863-1870 , 文章类型： Article，,卷期：2008年91-10] Chemical investigation of the fruits of Viburnum dilatatum THUNB. resulted in the isolation and characterization of four new phenolic glycosides, jiamiziosides A-D (1-4), together with five known compounds. Their structu... Nortriterpenoids from Schisandra wilsoniana [作者：Yang, GY; Xiao, WL; Chang, Y; Wang, RR; Pu, JX; Gao, XM; Lei, C; Lu, Y; Zheng, YT; Sun, HD,期刊：Helvetica Chimica Acta, 页码：1871-1878 , 文章类型： Article，,卷期：2008年91-10] Three new highly oxygenated nortriterpenoids, wilsonianadilactones A-C (1-3), together with twelve known ones, i.e., 4-15, were isolated from the leaves and stems of Schisandra wilsoniana. Their structures were establish... Synthesis and Reactivity in [3+2] Cycloadditions of Isoxanthopterin N(5)-Oxides - A New Synthesis of 6-Substituted Pteridinediones [作者：Steinlin, T; Sonati, T; Vasella, A,期刊：Helvetica Chimica Acta, 页码：1879-1887 , 文章类型： Article，,卷期：2008年91-10] Intramolecular condensation of the N-(4-amino-5-nitrosopyrimidin-4-yl)-2-chloroacetamide 2 led to the pteridinone N(5)-oxide 4, while treatment of 2 with Me,P yielded the 8-(chloromethyl)purine 3. A high-yielding [3 + 2]... Dioxopiperazine Alkaloids Produced by the Marine Mangrove Derived Endophytic Fungus Eurotium rubrum [作者：Li, DL; Li, XM; Li, TG; Dang, HY; Wang, BG,期刊：Helvetica Chimica Acta, 页码：1888-1893 , 文章类型： Article，,卷期：2008年91-10] Cultivation of the fungal strain Eurotium rubrum, an endophytic fungus that was isolated from the inner tissue of stems of the mangrove plant Hibiscus tiliaceus, resulted in the isolation of two new dioxopiperazine deriv... Four New Compounds from Sinacalia tangutica [作者：Zhu, Y; Zhao, Y; Huang, GD; Wu, WS,期刊：Helvetica Chimica Acta, 页码：1894-1901 , 文章类型： Article，,卷期：2008年91-10] Four new compounds, 9 alpha-hydroxy-1 beta-methoxycaryolanol (1), stigmast-5-ene-7 alpha,22 alpha-diol-3 beta-tetradecanoate (2), 7-O-(6'-acetoxy-beta-D-glucopyranosyl)coumarin (3), and 8-O-(6'-acetoxy-beta-D-glucopyrano... Competitive Intramolecular Aryl- and Alkyl-C-H Bond Activation and Ligand Evaporation from Gaseous Bisimino Complexes [Pt(L)(CH3)((CH3)(2)S)](+) (L=C6H5N=C(CH3)-C(CH3)=NC6H5) [作者：Butschke, B; Schlangen, M; Schroder, D; Schwarz, H,期刊：Helvetica Chimica Acta, 页码：1902-1915 , 文章类型： Article，,卷期：2008年91-10] Mechanistic details for the formation of methane from the title compound as well as the combined elimination of (CH3)(2)S/CH4 are derived from various mass-spectrometric experiments including deuterium-labeling Studies a... Synthesis and Selected Transformations of 1H-Imidazole 3-Oxides Derived from Amino Acid Esters [作者：Jasinski, M; Mloston, G; Linden, A; Heimgartner, H,期刊：Helvetica Chimica Acta, 页码：1916-1933 , 文章类型： Article，,卷期：2008年91-10] A series of now optically active 1H-imidazole 3-oxides 5 with a substituted acetate group at N(1) as the chiral unit were prepared by the reaction of alpha-(hydroxyimino) ketones, alpha-amino acid methyl esters, and form... New Acyclic 12-Hydroxygeranylgeraniol-Derived Diterpenoids from the Seeds of Carpesium triste [作者：Gao, X; Zhang, ZX; Jia, ZJ,期刊：Helvetica Chimica Acta, 页码：1934-1939 , 文章类型： Article，,卷期：2008年91-10] Five new acyclic 12-hydroxygeranylgeraniol-derived diterpenoids, i.e., 1-5, were isolated from the seeds of Carpesium triste. The structures including the absolute configurations of the new compounds were elucidated by s... Highly Oxygenated Triterpenoids from the Marine Red Alga Laurencia mariannensis (Rhodomelaceae) [作者：Ji, NY; Li, XM; Xie, H; Ding, J; Li, K; Ding, LP; Wang, BG,期刊：Helvetica Chimica Acta, 页码：1940-1946 , 文章类型： Article，,卷期：2008年91-10] Two new and one known squalenoid-derived triterpenoids. namely, laurenmariannol (1) and (21 alpha)-21-hydroxythyrsiferol (2). and the known thyrsiferol (3) were isolated and identified from the marine red alga Laurencia ... Rhodium Fluoroapatite Catalyzed Conjugate Addition of Arylboronic Acids to alpha,beta-Unsaturated Carbonyl Compounds [作者：Kantam, ML; Subrahmanyam, VB; Kumar, KBS; Venkanna, GT; Sreedhar, B,期刊：Helvetica Chimica Acta, 页码：1947-1953 , 文章类型： Article，,卷期：2008年91-10] Rhodium fluoroapatite (RhFAP) is an efficient catalyst for conjugate addition of organoboron reagents to alpha,beta-unsaturated carbonyl compounds. A variety of arylboronic acids and alpha,beta-unsaturated carbonyl compo... Two New C-20-Diterpenoid Alkaloids from the Tibetan Medicinal Plant Aconitum naviculare STAPF [作者：Cao, JX; Li, LB; Ren, J; Jiang, SP; Tian, RR; Chen, XL; Peng, SL; Zhang, J; Zhu, HJ,期刊：Helvetica Chimica Acta, 页码：1954-1960 , 文章类型： Article，,卷期：2008年91-10] Two new C-20-diterpenoid alkaloids named naviculine A (1) and naviculine B (2), were isolated from Aconitum naviculare STAPF. Their structures were established by spectral methods, especially 2D-NMR spectra (H-1,H-1-COSY...