- Palladium Nanoparticles on Graphite Oxide as Catalyst for Suzuki-Miyaura, Mizoroki-Heck, and Sonogashira Reactions
[作者:Rumi, L; Scheuermann, GM; Mulhaupt, R; Bannwarth, W,期刊:Helvetica Chimica Acta, 页码:966-976 , 文章类型: Article,,卷期:2011年94-6]
- Pd2+-Exchanged graphite oxide (GO) serves as a precatalyst for the formation of Pd-nanoparticles which are then deposited on the highly functionalized carbonaceous support. This versatile, air-stable, and ligand-free sys...
- One-Pot Synthesis of 2-Substituted 4-Aryl-4,5-dihydro-3,1-benzoxazepines from 2-(2-Aminophenyl)-1-arylethanols via Dehydration of the Corresponding Amides
[作者:Fukamachi, S; Konishi, H; Kobayashi, K,期刊:Helvetica Chimica Acta, 页码:987-992 , 文章类型: Article,,卷期:2011年94-6]
- An efficient method for the preparation of 2-substituted 4-aryl-4,5-dihydro-3,1-benzoxazepine derivatives under mild conditions has been developed. The reaction of 2-(2-aminophenyl)ethanols 1 with acid chlorides in the p...
- Synthesis of Poly-Aib Oligopeptides and Aib-Containing Peptides via the 'Azirine/Oxazolone Method', and Their Crystal Structures
[作者:Dannecker-Dorig, I; Linden, A; Heimgartner, H,期刊:Helvetica Chimica Acta, 页码:993-1011 , 文章类型: Article,,卷期:2011年94-6]
- The protected poly-Aib oligopeptides Z-(Aib)(n)-N(Me)Ph with n = 2-6 were prepared according to the 'azirine/oxazolone method', i.e., by coupling amino or peptide acids with 2,2,N-trimethyl-N-phenyl-2H-azirin-3-amine (la...
- Isolation and Structural Elucidation of Novel Mycosporine-Like Amino Acids as Alarm Cues in the Defensive Ink Secretion of the Sea Hare Aplysia californica
[作者:Kamio, M; Kicklighter, CE; Nguyen, L; Germann, MW; Derby, CD,期刊:Helvetica Chimica Acta, 页码:1012-1018 , 文章类型: Article,,卷期:2011年94-6]
- Three new mycosporine-like amino acids (MAAs), aplysiapalythines A, B, and C (1, 2, and 3, resp.) were isolated from opaline, a glandular component of the defensive ink secretion of sea hares (Aplysia californica) collec...
- Two New Alkaloids from Daphniphyllum angustifolium HUTCH.
[作者:He, T; Zhou, Y; Wang, YH; Mu, SZ; Hao, XJ,期刊:Helvetica Chimica Acta, 页码:1019-1023 , 文章类型: Article,,卷期:2011年94-6]
- Daphangustifolines A and B (1 and 2), two new Daphniphyllum alkaloids were isolated from the whole plant of Daphniphyllum angustifolium HUTCH. Their structures were established on the basis of spectroscopic data. Their c...
- One-Pot, Four-Component Synthesis of Fully Substituted 1,3,4-Oxadiazole Derivatives from (Isocyanoimino)triphenylphosphorane, a Primary Amine, an Aromatic Carboxylic Acid, and Chloroacetone
[作者:Ramazani, A; Nasrabadi, FZ; Ahmadi, Y,期刊:Helvetica Chimica Acta, 页码:1024-1029 , 文章类型: Article,,卷期:2011年94-6]
- The 1 : 1 imine intermediate 7 generated by the addition of a primary amine 2 to chloroacetone (1) is trapped by (isocyanoimino)triphenylphosphorane (4) in the presence of an aromatic carboxylic acid 3 and leads to the f...
- Photocycloaddition of 4-(Alk-1-ynyl)-Substituted Coumarins and Thiocoumarins to 2,3-Dimethylbuta-1,3-diene
[作者:Inhulsen, I; Chin, K; Gowert, M; Margaretha, P,期刊:Helvetica Chimica Acta, 页码:1030-1034 , 文章类型: Article,,卷期:2011年94-6]
- On irradiation (350 nm) in the presence of 2,3-dimethylbuta-1,3-diene (8), 4-(alk-1-ynyl)coumarins 1 afford mixtures of cyclobuta- and cycloocta-annulated products 9 and 10, respectively. In contrast, the corresponding t...
- Citropremide and Citropridone: A New Ceramide and a New Acridone Alkaloid from the Stem Bark of Citropsis gabunensis
[作者:Tsassi, BV; Hussain, H; Geagni, A; Dongo, E; Ahmed, I; Riaz, M; Krohn, K,期刊:Helvetica Chimica Acta, 页码:1035-1040 , 文章类型: Article,,卷期:2011年94-6]
- The structure elucidation and complete H-1- and C-13-NMR assignments are reported for two new compounds: the ceramide citropremide (1), and the acridone alkaloid citropridone (2). Both of these secondary metabolites were...
- Oleanane-Type Triterpenoids from the Endophytic Fungus Pestalotiopsis clavispora Isolated from the Chinese Mangrove Plant Bruguiera sexangula
[作者:Luo, DQ; Deng, HY; Yang, XL; Shi, BZ; Zhang, JZ,期刊:Helvetica Chimica Acta, 页码:1041-1047 , 文章类型: Article,,卷期:2011年94-6]
- Three new triterpenoid derivatives, named (15 alpha)-15-hydroxysoyasapogenol B (1), (7 beta,15 alpha)-7,15-dihydroxysoyasapogenol B (2), and (7 beta)-7,29-dihydroxysoyasapogenol B (3), were isolated from cultures of the ...
- Copper-Catalyzed Bis(methoxycarbonyl)carbene Reactions of alpha,beta-Unsaturated Carboxamides
[作者:Merey, G; Anac, O,期刊:Helvetica Chimica Acta, 页码:1053-1064 , 文章类型: Article,,卷期:2011年94-6]
- The [Cu(acac)(2)]-catalyzed reactions of alpha,beta-unsaturated carboxamides with dimethyl diazomalonate yielded dihydrofuran derivatives by a 1,5-electrocyclic reaction at C(beta), and butadiene derivatives by carbene a...
- Two New Cyclic Pentapeptides from the Marine-Derived Fungus Aspergillus versicolor
[作者:Zhou, LN; Gao, HQ; Cai, SX; Zhu, TJ; Gu, QQ; Li, DH,期刊:Helvetica Chimica Acta, 页码:1065-1070 , 文章类型: Article,,卷期:2011年94-6]
- Two new cyclic pentapeptides, named versicotides A (1) and B (2), were obtained from a marine-derived fungus strain ZLN-60, identified as Aspergillus versicolor. Their structures were established on the basis of chemical...
- Beilschmiedic Acids F and G, Further Endiandric Acid Derivatives from Beilschmiedia anacardioides
[作者:Chouna, JR; Nkeng-Efouet, PA; Lenta, BN; Wansi, JD; Neumann, B; Stammler, HG; Kimbu, SF; Sewald, N,期刊:Helvetica Chimica Acta, 页码:1071-1076 , 文章类型: Article,,卷期:2011年94-6]
- Two new endiandric acid derivatives, beilschmiedic acid F (1) and beilschmiedic acid G (2), together with three known constituents, beilschmiedic acid A, beilschmiedic acid C, and sitosterol 3-beta-D-glucopyranoside, wer...
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