- Four New 1,4-Benzoquinone Derivatives and One New Coumarin Isolated from Ardisia gigantifolia
[作者:Liu, HW; Zhao, YS; Yang, RY; Zheng, MQ; Wang, MY; Zhang, X; Qiu, F; Wang, HS; Zhao, F,期刊:Helvetica Chimica Acta, 页码:249-256 , 文章类型: Article,,卷期:2010年93-2]
- Four new 1,4-benzoquinone derivatives, belamcandaquinones J (1), K (2), L(3), and M (4), and one new coumarin, 5, were isolated from the rhizome of Ardisia gigantifolia. Their structures were established by means of spec...
- An Improved Protocol for the Synthesis of Quinoline-2,3-dicarboxylates under Neutral Conditions via Biomimetic Approach
[作者:Madhav, B; Murthy, SN; Rao, KR; Nageswar, YVD,期刊:Helvetica Chimica Acta, 页码:257-260 , 文章类型: Article,,卷期:2010年93-2]
- A mild and efficient protocol for synthesis of quinoline derivatives if, aqueous medium under neutral conditions is described. The reaction proceeded smoothly in H2O catalyzed by supramolecular catalyst beta-CD. By this ...
- TiO2 as a Reusable Catalyst for the One-Pot Synthesis of 3,4-Dihydropyrimidin-2 (1H)-ones under Solvent-Free Conditions
[作者:Kassaee, MZ; Masrouri, H; Movahedi, F; Mohammadi, R,期刊:Helvetica Chimica Acta, 页码:261-264 , 文章类型: Article,,卷期:2010年93-2]
- An efficient solvent-free method for the synthesis of various 3,4-dihydropyrimidin-2(1H)-ones using TiO2 as a recyclable heterogeneous catalyst is described. Compared to know methods, satisfactory results are obtained wi...
- New alpha-Tetralone Galloylglucosides from the Fresh Pericarps of Juglans sigillata
[作者:Liu, Q; Zhao, P; Li, XC; Jacob, MR; Yang, CR; Zhang, YJ,期刊:Helvetica Chimica Acta, 页码:265-271 , 文章类型: Article,,卷期:2010年93-2]
- Three new alpha-tetralone galloylghlcosides, 1-3, were isolated from the fresh pericarps of Juglans sigillata (Juglandaceae), together with six known compounds. The structures of the new compounds were determined as 1,2,...
- Dihydrobenzofuran Norlignans from the Leaves of Cedrela sinensis A. Juss
[作者:Lee, IS; Kim, HJ; Youn, UJ; Chen, QC; Kim, JP; Ha, DT; Ngoc, TM; Min, BS; Lee, SM; Jung, HJ; Na, MK; Bae, KH,期刊:Helvetica Chimica Acta, 页码:272-276 , 文章类型: Article,,卷期:2010年93-2]
- Two new norlignans, cedralins A (1) and B (2), were isolated from the leaves of Cedrela sinensis. Their structures were established by extensive spectroscopic studies and chemical evidence. The absolute configurations of...
- Verticillane-Type Diterpenoids and an Eudesnianolide-Type Sesquiterpene from the Formosan Soft Coral Cespitularia hypotentaculata
[作者:Lin, YC; El-Razek, MHA; Shen, YC,期刊:Helvetica Chimica Acta, 页码:281-289 , 文章类型: Article,,卷期:2010年93-2]
- Four new diterpertes, cespihypotins W-Z (1-4) having the verticillane skeleton and characterized by all alpha,beta-unsaturated gamma-hydroxycyclopentano moiety, and a new eudesmanolide-type sesquiterpene, cespilactam A (...
- Three New Glycosides from Viburnum plicatum THUNB. var. tomentosum MIQ.
[作者:Machida, K; Sagawa, H; Onoguchi, R; Kikuchi, M,期刊:Helvetica Chimica Acta, 页码:290-297 , 文章类型: Article,,卷期:2010年93-2]
- Three new glycosides, 7-O-tigloylsecologanol (1). 7-O-tigloylsecologanolic anolic acid (2), and 3'-O-[(2S)-2-methylbutanoyl]henryoside (3), together with seven known ones, were isolated from the leaves of Viburnum plicat...
- New C-27 Steroidal Bisdesmosides from the Fresh Stems of Dracaena cambodiana
[作者:Xu, M; Yang, CR; Zhang, YJ,期刊:Helvetica Chimica Acta, 页码:302-308 , 文章类型: Article,,卷期:2010年93-2]
- Two new steroidal bisdesmosides, cambodracanosides A and B (1 and 2, resp.), were isolated from the fresh stems of Dracaena cambodiana, together with seven known glycosides. The structures of the new saponins were elucid...
- Synthesis of Carbocyclic Pyrimidine Nucleosides Using the Mitsunobu Reaction: O-2- vs. N-1-Alkylation
[作者:Quezada, E; Vina, D; Delogu, G; Borges, F; Santana, L; Uriarte, E,期刊:Helvetica Chimica Acta, 页码:309-313 , 文章类型: Article,,卷期:2010年93-2]
- The Mitsunobu reaction is an important tool in carbocyclic nucleoside chemistry for the direct coupling of alcohols with heterocyclic bases under mild conditions. Chemical evidences for an unusual competitive O-2- vs. N-...
- Benzyl N-[(Benzyloxy)methyl]carbamate: An Improved Aminomethylation Electrophile for the Synthesis of (Benzyloxy)carbonyl (Cbz)-Protected Chiral beta(2)-Amino Acids
[作者:Brocklehurst, CE; Furegati, M; Muller-Hartwieg, JCD; Ossola, F; La Vecchia, L,期刊:Helvetica Chimica Acta, 页码:314-323 , 文章类型: Article,,卷期:2010年93-2]
- alpha-Aminomethylation of (R)-DIOZ-alkylated (DIOZ=4-isopropyl-5,5-diphenyloxitzolidin-2-one) substrates is a key step in the asymmetric synthesis of beta(2)-amino acids, but it is unfortunately often accompanied by form...
- Two New 7-Dehydrobrefeldin A Acids from Cylindrocarpon obtusisporum, an Endophytic Fungus of Trewia nudiflora
[作者:Yu, BZ; Zhu, N; Du, ZZ,期刊:Helvetica Chimica Acta, 页码:324-328 , 文章类型: Article,,卷期:2010年93-2]
- Two new 7-dehydrobrefeldin A acids, (2E,4R*)-4-hydroxy-4-[(1R*,2S*)-4-oxo-2-[(1E)-6-oxohept-1en-1-yl]-4-oxocyclopentyl]but-2enoic acid (3) and (2E,4R*)-4-hydroxy-4-[(1R*,2S*)-2-[(1E,6S*)-6-hydroxy-hept-1-en-1-yl]-4-oxocy...
- New Diarylheptanoids and Kavalactone from Alpinia katsumadai HAYATA
[作者:Li, YY; Chou, GX; Wang, ZT,期刊:Helvetica Chimica Acta, 页码:382-388 , 文章类型: Article,,卷期:2010年93-2]
- Two new diarylheptanoids, katsumains A (1) and B (2), and one new kavalactone, katsumadain (3). together with the three known compounds (4E,6E)-1,7-diphenlhepta-4,6-dien-3-one (4), (5R,6E)-1,7-diphenyl-5-hydroxyhept-6-en...
- New Triterpenoid Saponins from the Roots of Gypsophila paniculata L.
[作者:Yao, S; Ma, L; Luo, JG; Wang, JS; Kong, LY,期刊:Helvetica Chimica Acta, 页码:361-374 , 文章类型: Article,,卷期:2010年93-2]
- The seven new triterpenoid saponins 1-7 were isolated from the roots of Gypsophila paniculata L. Their structures were established by 1D- and 2D-NMR techniques, HR-MS, and acid hydrolysis. The isolated compounds include ...
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