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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   Indole Alkaloids from the Leaves of Anthocephalus chinensis [作者：Zhou, H; He, HP; Kong, NC; Wang, TJ; Hao, XJ,期刊：Helvetica Chimica Acta, 页码：2148-2152 , 文章类型： Article，,卷期：2008年91-11] Anthocephalusine A (1) and 3 beta-isodihydrocadambine 4-oxide (2) were isolated from the leaves of Anthocephalus chinensis (Rubiaceac), together with five known compounds. The structures were established by spectroscopic... Three New Alkaloids, Paxiphyllines C-E, from Daphniphyllum paxianum [作者：Zhang, Y; Di, YT; Liu, HY; Li, CS; Tan, CJ; Zhang, Q; Fang, X; Li, SL; Hao, XJ,期刊：Helvetica Chimica Acta, 页码：2153-2158 , 文章类型： Article，,卷期：2008年91-11] Nine Daphniphyllum alkaloids, including three new ones, paxiphyllines C-E (1-3, resp.), were isolated from the twigs and the leaves of Daphniphyllum paxianum. Paxiphylline C (1) represents the first example of Daphniphyl... Phenolic Derivatives from Fruits of Dipteryx lacunifera DUCKE and Evaluation of Their Antiradical Activities [作者：Junior, GMV; Sotssa, CMD; Cavalheiro, AL; Lago, JHG; Chaves, MH,期刊：Helvetica Chimica Acta, 页码：2159-2167 , 文章类型： Article，,卷期：2008年91-11] The fruits of Dipteryx lacunifera, known as 'fava de morcego' and 'garampara', comprise pleasant tasting kernels that contain high amounts of fatty acids (mainly oleic acid) and are commonly consumed by inhabitants of th... Chemical Constituents from Myrsine africana L. [作者：Zou, YP; Tan, CH; Wang, RD; Zhu, DY; Kim, SK,期刊：Helvetica Chimica Acta, 页码：2168-2173 , 文章类型： Article，,卷期：2008年91-11] Three new compounds, myrsinoside A (= 2,4-dihydroxy-6-methylphenyl beta-D-(6'-galloyl)glucopyranoside 1), myrsinoside B (2,4-dihydroxy-6-methylphenyl beta-D-glucopyranoside: 2), and (3 beta,16 alpha,20 alpha)- 3,16,28-tr... New Sesquiterpenes from Edible Fungus Clavicorona pyxidata [作者：Zheng, YB; Lu, CH; Zheng, ZH; Lin, XJ; Su, WJ; Shen, YM,期刊：Helvetica Chimica Acta, 页码：2174-2180 , 文章类型： Article，,卷期：2008年91-11] Three new sesquiterpenes, pyxidatol A - C (1-3, resp.). were obtained from the fermentation culture of Clavaria pyxidata, together with two known ones. tsugicoline E (4) and omphadiol (5). Their structures were elucidate... Oligonucleotide Analogues with Integrated Bases and Backbones Part 19 Gelation of Organic Solvents by Self-Complementary A*[s]U-(*) Dinucleosides [作者：Bogliotti, N; Ritter, A; Hebbe, S; Vasella, A,期刊：Helvetica Chimica Acta, 页码：2181-2202 , 文章类型： Article，,卷期：2008年91-11] The A*[s]U-(*) dinucleosides 1 and 2 form thermoreversible gels in organic solvents. The basis of the gelation is the formation of linear aggregates by base pairing following desolvation of the nucleobases. This is evide... Isolation and X-Ray Structures of Reactive Intermediates of Organocatalysis with Diphenylprolinol Ethers and with Imidazolidinones A Survey and Comparison with Computed Structures and with 1-Acyl-imidazolidinones: The 1,5-Repulsion and the Geminal-Diaryl Effect at Work [作者：Seebach, D; Groselj, U; Badine, DM; Schweizer, WB; Beck, AK,期刊：Helvetica Chimica Acta, 页码：1999-2034 , 文章类型： Review，,卷期：2008年91-11] Reaction of 2-phenylacetaldehyde with the Me3Si ether of diphenyl-prolinol, with removal of H2O, gives a crystalline (1). The HBF4 salts of the MePh2Si ether if diphenyl-prolinol and of 2-(tert-butyl)-3-methyl and 5-benz... Electrophilic S-Trifluoromethylation of Cysteine Side Chains in alpha- and beta-Peptides: Isolation of Trifluoronethylated Sandostatin (R) (Octreotide) Derivatives [作者：Capone, S; Kieltsch, I; Flogel, O; Lelais, G; Togni, A; Seebach, D,期刊：Helvetica Chimica Acta, 页码：2035-2056 , 文章类型： Review，,卷期：2008年91-11] The new electrophilic trifluormethylating 1-(trifluoromethyl)-benziodoxole reagents A and B (Scheme I) have been used to selectively attach CF3 groups to the Satom of cysteine side chains of alpha- and beta-peptides (up ... Synthetic Studies on Camptothecins Part 1 An Improved Asymmetric Total Synthesis of (20S)-Camptothecin [作者：Zhang, LP; Bao, Y; Knang, YY; Chen, FE,期刊：Helvetica Chimica Acta, 页码：2057-2061 , 文章类型： Article，,卷期：2008年91-11] A six-step asymmetric total synthesis of (20S)-camptothecin (1) has been accomplished in 25% overall yield starting from the known pyridone 3. The key steps in this synthesis are the chemoselective Ni-catalyzed hydrogena... Pyridine-4-thiol and Amphoteric Analogs: Novel Protection of Aryl Bromides in Strong Alkali [作者：Chen, WM; Cheng, C; Li, BZ; Ho, TL; Cai, ZS; Wang, YQ; Sun, PH,期刊：Helvetica Chimica Acta, 页码：2062-2068 , 文章类型： Article，,卷期：2008年91-11] The use of pyridine-4-thiol (PT) to preserve certain aryl bromides in strong alkali is reported (Scheme 1). The presence of this additive or of sonic of its amphoteric analogs such as 3-hydroxypyridin-4(1H)-ones suppress... Further New Bis-cembranoids from the Hainan Soft Coral Sarcophyton tortuosum [作者：Jia, R; Guo, YW; Mollo, E; Gavagnin, M; Cimino, G,期刊：Helvetica Chimica Acta, 页码：2069-2074 , 文章类型： Article，,卷期：2008年91-11] Two new bis-cembranoids, ximaolides F (1) and G (2), were isolated from the Hainan soft coral Sarcophyton tortuosum. The structures and relative configurations of the two new compounds were elucidated by the combination ... Two Novel Triterpenoids from Portulaca oleracea L. [作者：Xin, HL; Xu, YF; Hou, YH; Zhang, YN; Yue, XQ; Lu, JC; Ling, CQ,期刊：Helvetica Chimica Acta, 页码：2075-2080 , 文章类型： Article，,卷期：2008年91-11] Two novel triterpenoids, (2 alpha, 3 alpha)-3-{[4-O-(beta-D-glucopyranosyl)-beta-D-xylopyranosyl]oxy}-2,2,3-dihydroxy-30-methoxy-30-oxoolean-12-en-28-oic acid (1) and (2 alpha,3 alpha)-2,23,30-trihydroxy-3-[(beta-D-xylop... A Benzofuranoid and Two Clerodane Diterpenoids from Pulicaria wightiana [作者：Venkateswarlu, K; Satyalakshmi, G; Suncel, K; Reddy, TS; Raju, TV; Das, B,期刊：Helvetica Chimica Acta, 页码：2081-2088 , 文章类型： Article，,卷期：2008年91-11] Methyl 5-formyl-1-benzofuran-6-carboxylate (1) and the two clerodane diterpenes, methyl 6-oxocleroda-3,13-dien-15,16-olid 18-oate (2) and 2 beta-(2-methylbutanoyl)cleroda-3,13-dien-15,16-olid-18-oic acid (3), together wi... Synthesis and Characterization of New Binaphthyl-Linked Phenanthroline-, Bipyridine-, or Pyridine-Derived Ligands, and the Study of Their Cytotoxic Activity [作者：Beynek, N; Ulucam, G; Benkli, K; Koparal, AT,期刊：Helvetica Chimica Acta, 页码：2089-2096 , 文章类型： Article，,卷期：2008年91-11] In the present work, we describe the synthesis and characterization of five new versatile acyclic or macrocyclic ligands containing binaphtyl-linked pyridine, bipyridine, or phenanthroline groups in their framework (see ... Clintoniosides A-C, New Polyhydroxylated Spirostanol Glycosides from the Rhizomes of Clintonia udensis [作者：Mimaki, Y; Watanabe, K,期刊：Helvetica Chimica Acta, 页码：2097-2106 , 文章类型： Article，,卷期：2008年91-11] Phytochemical analyses were carried out on the rhizomes of Clintonia udensis (Liliaceae) with particular attention paid to the steroidal glycoside constituents, resulting in the isolation of three new polyhydroxylated sp... A New Alkaloid from Lycopodium japonicum THUNB. [作者：Sun, Y; Yan, J; Meng, H; He, CL; Yi, P; Qiao, Y; Qiu, MH,期刊：Helvetica Chimica Acta, 页码：2107-2109 , 文章类型： Article，,卷期：2008年91-11] A new alkaloid, miyoshianine C (1), was isolated from the whole plants of Lycopodium japonicum THUNB., together with the known four compounds alpha-obscurine (2), lycodoline (3), miyoshianine A (4), and lucidioline (5). ...