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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23条记录   Eremophilane-type sesquiterpenes from the roots of Ligularia virgaurea [作者：Zhang, ZX; Fei, DQ; Jia, ZJ,期刊：Helvetica Chimica Acta, 页码：1045-1052 , 文章类型： Article，,卷期：2008年91-6] From the roots of Ligularia virgaurea, five new eremophilane-type sesquiterpenes were isolated, including three new eremophilenolides, 6 beta-(angeloyloxy)-1 alpha,8 beta,10 beta-trihydroxyeremophil-7(11)-en-12,8 alpha-o... Four new dibenzocyclooctadiene lignans from Schisandra rubriflora [作者：Li, HM; Luo, YM; Pu, JX; Li, XN; Lei, C; Wang, RR; Zheng, YT; Sun, HD; Li, RT,期刊：Helvetica Chimica Acta, 页码：1053-1062 , 文章类型： Article，,卷期：2008年91-6] From the aerial parts of Schisandra rubriflora (FRANCH) REHD. et WILS., four new dibenzocyclooctadiene lignans, methylgomisin R (1), (+)-14-tigloylgomisin K-3 (2), 12-demethylwuweilignan I (3), schisandrene A (4), togeth... Ligand-exchange processes on solvated beryllium cations - Part III. Which model reaction is preferable for quantum-chemical investigations of a water-exchange mechanism? [作者：Puchta, R; van Eldik, R,期刊：Helvetica Chimica Acta, 页码：1063-1071 , 文章类型： Article，,卷期：2008年91-6] On the basis of DFT calculations (B3LYP/6-311 + G**), the possibility to include solvent effects is considered in the investigation of the H2O-exchange mechanism on [Be(H2O)(4)](2+) within the widely used cluster approac... Iridoids from Viburnum cylindricum [作者：Chen, XZ; Wu, HF; Li, GY; Lu, SM; Li, BG; Fang, DM; Zhang, GL,期刊：Helvetica Chimica Acta, 页码：1072-1076 , 文章类型： Article，,卷期：2008年91-6] Two new iridoids, methyl (+)-rel-(1R,3S,4R,5R,8R,9R)-1,3,4,5,8,9-hexahydro-8-hydroxy-3-methoxy-2H-1a,2-dioxacyclopent[cd]indene-4-carboxylate (1) and methyl (+)-rel-(1R,3S,4S,5R,8R,9R)-1,3,4,5,8,9-hexahydro-8-hydroxy-3-m... Taccalonolides W-Y, three new pentacyclic steroids from Tacca plantaginea [作者：Yang, JY; Zhao, RH; Chen, CX; Ni, W; Teng, F; Hao, XJ; Liu, HY,期刊：Helvetica Chimica Acta, 页码：1077-1082 , 文章类型： Article，,卷期：2008年91-6] Three new pentacyclic steroids, taccalonolides W-Y (2-4, resp.), have been isolated from the whole plants of Tacca plantaginea. Their structures were elucidated on the basis of spectroscopic methods including extensive 1... 7-halogenated 7-deazapurine 2 '-deoxyribonucleosides related to 2 '-deoxyadenosine, 2 '-deoxyxanthosine, and 2 '-deoxyisoguanosine: Syntheses and properties [作者：Seela, F; Xu, KY,期刊：Helvetica Chimica Acta, 页码：1083-1105 , 文章类型： Article，,卷期：2008年91-6] A series of 7-fluorinated 7-deazapurine 2'-deoxyribonucleosides related to 2'-deoxyadenosine, 2'-deoxyxanthosine, and 2'-deoxyisoguanosine as well as intermediates 4b-7b, 8, 9b, 10b, and 17b were synthesized. The 7-fluor... New components including cyclopeptides from barks of Christiana africana DC. (Tiliaceae) [作者：Michalet, S; Payen-Fattaccioli, L; Beney, C; Cegiela, P; Bayet, C; Cartier, G; Noungoue-Tchamo, D; Tsamo, E; Mariotte, AM; Dijoux-Franca, MG,期刊：Helvetica Chimica Acta, 页码：1106-1117 , 文章类型： Article，,卷期：2008年91-6] Phytochemical investigation of barks of Christiana africana led to the identification of cyclopeptide alkaloids, flavonoids, coumarinolignans, iridoids, sesquiterpenoids, and triterpenes. This plant was classified so far... New sesquiterpenoids from Ligularia duciformis [作者：Wang, WS; Dai, X; Hong, LY; Lu, P; Feng, JC; Jiao, YG,期刊：Helvetica Chimica Acta, 页码：1118-1123 , 文章类型： Article，,卷期：2008年91-6] From the whole plants of Ligularia duciformis, four new sesquiterpenoids, 3 beta-acetoxy-6 beta-methoxyeremophila-7(11),9(10)-dien-12,8 beta-olide (1), 3 beta-acetoxy-8 alpha-hydroxy-6 beta-methoxyeremophila-7(11),9(10)-... Two new alkaloids from Flueggea virosa [作者：Wang, GC; Wang, Y; Li, Q; Liang, JP; Zhang, XQ; Yao, XS; Ye, WC,期刊：Helvetica Chimica Acta, 页码：1124-1129 , 文章类型： Article，,卷期：2008年91-6] Two new securinega-type alkaloids and four known ones were isolated from the twigs and leaves of Flueggea virosa. The structures of the new compounds were elucidated by means of spectroscopic methods (UV, IR, HR-ESI-MS, ... ent-kaurane diterpenoids from Isodon phyllostachys [作者：Li, X; Weng, ZY; Li, Y; Pu, JX; Huang, SX; Xiao, WL; Sun, HD,期刊：Helvetica Chimica Acta, 页码：1130-1136 , 文章类型： Article，,卷期：2008年91-6] Phytochemical investigation of the medicinal plant Isodon phyllostachys led to the isolation of four new ent-kaurane diterpenoids, phyllostacins F-I (1-4, resp.), together with 11 known compounds, rosthorin A (5), rabdot... Two new pseudoguaianolides from the flowers of Parthenium hysterophorus [作者：Das, B; Reddy, KR; Ravikanth, B; Venkata, A; Sarma, S; Sridhar, B,期刊：Helvetica Chimica Acta, 页码：1137-1143 , 文章类型： Article，,卷期：2008年91-6] Chemical investigation on two samples of the flowers of Parthenium hysterophorus afforded two new pseudoguaianolides (one from each sample) together with several known constituents. The structures of the new compounds we... Surprising formation of chlorinated butenolides from dialkyl acetylenedicarboxylates and hexachloroacetone in the presence of triphenyl phosphite [作者：Yavari, I; Sabbaghan, M; Hossaini, Z; Ghazanfarpour-Darjani, M,期刊：Helvetica Chimica Acta, 页码：1144-1147 , 文章类型： Article，,卷期：2008年91-6] Triphenyl phosphite reacts smoothly with dialkyl acetylenedicarboxylates and hexachloroacetone to produce alkyl 2-(dichloromethylene)-2,5-dihydro-5-oxo-4-(trichloromethyl)furan-3-carboxylates in good yields. Base mediated aromatization of carbonyl condensation products derived from 2-(2-bromoprop-2-enyl)cyclohexanone derivatives via 'intramolecular unsaturation transfer' [作者：Yazicioglu, EY; Akhmedov, IM; Tanyeli, C,期刊：Helvetica Chimica Acta, 页码：1148-1155 , 文章类型： Article，,卷期：2008年91-6] Alkylbenzenes are synthesized for the first time from aliphatic hydrocarbons via an one pot, transition metal-free coupling approach under basic conditions. The method consists of two steps: condensation of 2-bromoprop-2... Secondary metabolites from the stem bark of Litsea akoensis and their cytotoxic activity [作者：Chang, SY; Cheng, MJ; Kuo, YH; Lee, SJ; Chang, HS; Chen, IS,期刊：Helvetica Chimica Acta, 页码：1156-1165 , 文章类型： Article，,卷期：2008年91-6] Six new butanolides, litseadioxanins A and B (1 and 2, resp.) bearing a 1,2-dioxane moiety, litseatrinolides A and B (3 and 4, resp.), and litseakolides D-1 and D-2 (5 and 6, resp.), were isolated from the stem bark of L... Fluorescence switches triggered by metal ions [作者：Wessig, P; Czapla, S; Schedler, U,期刊：Helvetica Chimica Acta, 页码：1166-1176 , 文章类型： Article，,卷期：2008年91-6] Molecular switches 1 with a modular architecture whose functional principle is based on conformational changes around two acetylene axes were developed. By systematic screening of various metal ions, it was found that es... Efficient synthesis of functionalized thiazoles from acid chlorides, tetramethylthiourea, ethyl bromopyruvate, and ammonium thiocyanate [作者：Yavari, I; Hossaini, Z; Seyfi, S; Shirgahi-Talari, F,期刊：Helvetica Chimica Acta, 页码：1177-1180 , 文章类型： Article，,卷期：2008年91-6] An efficient synthesis of ethyl 2-(dimethylamino)-1,3-thiazole-4-carboxylates is described via a four-component reaction between acid chlorides, tetramethylthiourea, ethyl bromopyruvate, and ammonium thiocyanate.