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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25条记录   Diazodiphenylmethane and monosubstituted butadienes: Kinetics and a new chapter of vinylcyclopropane chemistry [作者：Ohta, A; Dahl, K; Raab, R; Geittner, J; Huisgen, R,期刊：Helvetica Chimica Acta, 页码：783-804 , 文章类型： Article，,卷期：2008年91-5] Diazodiphenylmethane (DDM) undergoes cycloadditions to 1-substituted buta-1,3-dienes exclusively at the C(3)=C(4) bond. At room temperature, the N-2 loss from the initially formed 4,5-dihydro-3H-pyrazoles 2 is faster tha... Stability of Hoogsteen-type triplexes - Electrostatic attraction between duplex backbone and triplex-forming oligonucleotide (TFO) using an intercalating conjugate [作者：Globisch, D; Bomholt, N; Filichev, VV; Pedersen, EB,期刊：Helvetica Chimica Acta, 页码：805-818 , 文章类型： Article，,卷期：2008年91-5] Syntheses are described for two novel twisted intercalating nucleic acid (TINA) monomers where the intercalator comprises a benzene ring linked to a naphthalimide moiety via an ethynediyl bridge. The intercalators Y and ... Biotransformation of vermitaline by Cunninghamella echinulata [作者：Lu, YF; Chen, KY; Li, HL; Pei, YH; Liu, RH; Zhang, WD,期刊：Helvetica Chimica Acta, 页码：819-824 , 文章类型： Article，,卷期：2008年91-5] Biotransformation of vermitaline (1) by Cunninghamella echinulata (ACCC 30369) was carried out. Four biotransformation products were obtained and three of them were characterized as new compounds. On the basis of their N... Constituents from leaves of Scolopia chinensis [作者：Lu, YN; Xie, GB; Bi, D; Shi, HM; Tu, PF,期刊：Helvetica Chimica Acta, 页码：825-830 , 文章类型： Article，,卷期：2008年91-5] Two new phenolic glycosides, scolochinenosides A and B (I and 2), and a new flavonoid glycoside, scoloside A (3), were isolated from the leaves of Scolopia chinensis (LOUR.) CLOS, together with eight known compounds. The... Crystal structure of akuammigine picrate hydrate [作者：Laus, G; Wurst, K,期刊：Helvetica Chimica Acta, 页码：831-837 , 文章类型： Article，,卷期：2008年91-5] The single-crystal X-ray data of akuammigine picrate hydrate (1 center dot Picr center dot H2O) confirm the relative configuration of the indole alkaloid akuammigine (1) as epiallo (Fig. 1). With reference to the known (... Yunnandaphninines F and G, new C-30 alkaloids from Daphniphyllum yunnanense [作者：Di, YT; Liu, LL; Li, CS; Zhang, Y; Zhang, Q; Mu, SZ; Sun, QY; Yang, FM; Liu, HY; Hao, XJ,期刊：Helvetica Chimica Acta, 页码：838-843 , 文章类型： Article，,卷期：2008年91-5] Eight C-30 Daphniphyllum alkaloids, including two new ones, yunnandaphninines F and G (1 and 2, resp.), were isolated from the leaves and stems of Daphniphyllum yunnanense. Their structures were elucidated on the basis o... A one-pot synthesis of 1,2-dihydroisoquinoline derivatives from isoquinoline via a four-component reaction [作者：Alizadeh, A; Zohreh, N,期刊：Helvetica Chimica Acta, 页码：844-849 , 文章类型： Article，,卷期：2008年91-5] A four-component reaction for the synthesis of 1,2-dihydroisoquinoline derivatives is described. The Huisgen 1,4-dipolar intermediate, which is produced from isoquinoline and an electron-deficient acetylene compound 1, r... Triterpenoids from the mangrove plant Hibiscus tiliaceus [作者：Feng, C; Li, XM; Ji, NY; Wang, BG,期刊：Helvetica Chimica Acta, 页码：850-855 , 文章类型： Article，,卷期：2008年91-5] Three new triterpenoids with the rarely occurring nigrum skeleton, namely (20E)-22-hydroxynigrum-20-en-3-one (1), 21 beta-hydroxynigrum-22(29)-en-3-one (2), and 21 alpha-hydroxynigrum-22(29)-en-3-one (3), were isolated f... Terpenoids from two Dicranopteris species [作者：Li, XL; Tu, L; Zhao, Y; Peng, LY; Xu, G; Cheng, X; Zhao, QS,期刊：Helvetica Chimica Acta, 页码：856-861 , 文章类型： Article，,卷期：2008年91-5] Two new compounds, (6S,13S)-6-{[beta-D-glucopyranosyl-(1 --> 4)-alpha-L-rhamnopyranosyl]oxy}cleroda-3,14-dien-13-ol (1) and kadsuric acid 3-methyl ester (2), together with nine known compounds, (6S,13E)6-{[ beta-D-glucop... Efficient iminophosphorane-mediated preparation of benzofuro-[3,2-d]pyrimidin-4(3H)-ones and unexpected ring opening products [作者：Hu, YG; Liu, MG; Ding, MW,期刊：Helvetica Chimica Acta, 页码：862-872 , 文章类型： Article，,卷期：2008年91-5] The carbodiimides 4, obtained from aza-Wittig reactions of iminophosphorane 3 with aromatic isocyanates, reacted with secondary amines, phenols or alcohols in the presence of catalytic amounts of K2CO3 or sodium alkoxide... Six new cembranolides from the Hainan soft coral Lobophytum sp. [作者：Chen, SH; Guo, YW; Huang, H; Cimino, G,期刊：Helvetica Chimica Acta, 页码：873-880 , 文章类型： Article，,卷期：2008年91-5] Six new cembrane diterpenes, lobophytolides A-F (1-6, resp.), along with six known related cembranoids, 7-12, were isolated from the Hainan soft coral Lobophytum sp. Their structures, including their relative configurati... Sesquiterpenoids from the resinous exudates of Commiphora opobalsamum (Burseraceae) [作者：Shen, T; Wan, WZ; Wang, XN; Sun, LM; Yuan, HQ; Wang, XL; Ji, M; Lou, HX,期刊：Helvetica Chimica Acta, 页码：881-887 , 文章类型： Article，,卷期：2008年91-5] Phytochemical investigation of the exudates of Commiphora opobalsamum led to the isolation of three new sesquiterpenoids, 2 alpha-methoxy-6-oxogermacra-1(10),7(11)-dien-8,12-olide (1), 5 beta-10 alpha-hydroxy-2 alpha-met... Correlation of hydrolysis and desilylation of 2-[(trimethylsilyl)methyl]acrylate derivatives in aqueous alkali solutions [作者：Kuroda, C; Sunakawa, T; Muguruma, Y,期刊：Helvetica Chimica Acta, 页码：888-896 , 文章类型： Article，,卷期：2008年91-5] Hydrolysis and desilylation reaction of 2-[(trimethylsilyl)methyl]acrylate (=2-[(trimethylsilyl)methyl]prop-2-enoate) derivatives were studied to evaluate the effect of the presence/absence of a further conjugating subst... Five new xanthenone O-glycosides from the roots of Polygala sibirica L. [作者：Zhou, YH; Jiang, Y; Shi, HM; Chen, YP; Tu, PF,期刊：Helvetica Chimica Acta, 页码：897-903 , 文章类型： Article，,卷期：2008年91-5] Five new xanthenone O-glycosides, sibiricaxanthone C (1), sibiricaxanthone D (2), sibiricaxanthone E (3), sibiricaxanthone F (4), and sibiricaxanthone G (5) were isolated from the roots of Polygala sibirica L., together ... Deracemization of a macrocyclic 1,1 '-biisoquinoline [作者：Dyker, G; Stirner, W; Henkel, G; Schreiner, PR,期刊：Helvetica Chimica Acta, 页码：904-913 , 文章类型： Article，,卷期：2008年91-5] The macrocyclic biisoquinoline 14 was synthesized in just four preparative steps starting from the simple biscarboxaldehyde 8. The interaction with camphorsulfonic acid induces an acid-catalyzed partial deracemization. Daphnoldines A and B, two new yuzurine alkaloids with a four-ring system, from the fruits of Daphniphyllum oldhami [作者：Zhang, Q; Di, YT; Liu, HY; Kong, NC; Gao, S; Li, CS; Zhang, Y; Li, SL; Hao, XJ,期刊：Helvetica Chimica Acta, 页码：914-919 , 文章类型： Article，,卷期：2008年91-5] Two new yuzurine alkaloids, daphnoldines A (1) and B (2), possessing a rare four-ring system, were isolated from the fruits of Daphniphyllum oldhami. Their structures were established on the basis of extensive spectrosco...