- Verification and Biophysical Characterization of a New Three-Color Forster Resonance-Energy-Transfer (FRET) System in DNA
[作者:Kienzler, AAN; Flehr, R; Gehne, S; Kumke, MU; Bannwarth, W,期刊:Helvetica Chimica Acta, 页码:543-555 , 文章类型: Article,,卷期:2012年95-4]
- We report on a new three-color FRET system consisting of three fluorescent dyes, i.e., of a carbostyril (=quinolin-2(1H)-one)-derived donor D, a (bathophenanthroline)ruthenium complex as a relay chromophore A1, and a Cy ...
- Synthesis of 4-Aryl-1,7-naphthyridine-2(1H)-thiones by the Electrocyclic Reaction of 4-(1-Arylalk-1-enyl)-3-isothiocyanatopyridines Generated in situ from the Corresponding Isocyanides
[作者:Kobayashi, K; Kozuki, T; Suzuki, T,期刊:Helvetica Chimica Acta, 页码:556-563 , 文章类型: Article,,卷期:2012年95-4]
- A convenient synthis for 4-substituted and 3,4-disubstituted 1,7-naphthyridine-2(1H)-thiones 7 has been developed. The method is based on the electrocyclic reaction of 4-(1-arylalk-1-enyl)-3-isothiocyanatopyridines 6, ge...
- On-Line Radical Scavenging Detection and Characterization of Antioxidants from Artemisia herba-alba
[作者:Dahmani-Hamzaoui, N; Salido, S; Linares-Palomino, PJ; Baaliouamer, A; Altarejos, J,期刊:Helvetica Chimica Acta, 页码:564-576 , 文章类型: Article,,卷期:2012年95-4]
- Four caffeoylquinic acid (CQA) derivatives, 5-O-caffeoylquinic acid (1), 3,5-di-O-caffeoylquinic acid (3), 4,5-di-O-caffeoylquinic acid (4), and 3,4,5-tri-O-caffeoylquinic acid (5), have been isolated from Artemisia herb...
- Unexpected Course of the Reaction of 2-Unsubstituted 1H-Imidazole 3-Oxides with Ethyl Acrylate
[作者:Mloston, G; Urbaniak, K; Wojciechowska, A; Linden, A; Heimgartner, H,期刊:Helvetica Chimica Acta, 页码:577-585 , 文章类型: Article,,卷期:2012年95-4]
- The attempted ethenylation at C(2) of 2-unsubstituted 1H-imidazole N-oxides with ethyl acrylate (=prop-2-enoate) in the presence of Pd(OAc)2 does not occur. In contrast to the other aromatic N-oxides, the [2+3] cycloaddi...
- Eremosides A-C, New Iridoid Glucosides from Eremostachys loasifolia
[作者:Ali, B; Mehmood, R; Mughal, UR; Malik, A; Safder, M; Hussain, R; Imran, M; Tareen, RB,期刊:Helvetica Chimica Acta, 页码:586-593 , 文章类型: Article,,卷期:2012年95-4]
- Eremosides AC (13), three new iridoid glucosides, were isolated from the AcOEt-soluble fraction of the EtOH extract of the whole plant of Eremostachys loasifolia, along with buddlejoside B (4), 10-O-benzoylcatalpol (5), ...
- Synthesis of 1,5-Disubstituted 1H-Tetrazole Derivatives via a Three-Component Reaction of Carbodiimides, Isocyanides, and Trimethylsilyl Azide
[作者:Kazemizadeh, AR; Hajaliakbari, N; Hajian, R; Shajari, N; Ramazani, A,期刊:Helvetica Chimica Acta, 页码:594-597 , 文章类型: Article,,卷期:2012年95-4]
- The three-component reaction of isocyanides 1, carbodiimides 2, and trimethylsilyl azide (3) occurs at room temperature, and the produced 1,5-disubstituted 1H-tetrazole derivatives 4 are formed in 8198% yields (Scheme 1,...
- A New Prenylated Isoflavone and a New Flavonol Glycoside from Flemingia philippinensis
[作者:Fu, MQ; Feng, SX; Zhang, NL; Zhou, XJ; Huang, RM; Huang, HJ; Xu, ZF; Li, XE; Qiu, SX,期刊:Helvetica Chimica Acta, 页码:598-605 , 文章类型: Article,,卷期:2012年95-4]
- A new prenylated isoflavonoid, flemiphilippinin G (1), and a new flavonol glycoside, flemiphilippininside (2), along with eleven known isoflavonoids were obtained from the roots of Flemingia philippinensis (Merr. et Rolf...
- Norlignans and Phenylpropanoids from Metasequoia glyptostroboides HU et CHENG
[作者:Zeng, Q; Cheng, XR; Qin, JJ; Guan, B; Chang, RJ; Yan, SK; Jin, HZ; Zhang, WD,期刊:Helvetica Chimica Acta, 页码:606-612 , 文章类型: Article,,卷期:2012年95-4]
- Five new compounds, i.e., the three new norlignans metasequirins GI (13) and the two new phenylpropanoids 7-(3-ethoxy-5-methoxyphenyl)propane-7,8,9-triol (=1-(3-ethoxy-5-methoxyphenyl)propane-1,2,3-triol; 4) and 7-(3-hyd...
- A Convergent Approach to Dibenzodioxocinones: Synthesis of Racemic Penicillide
[作者:Deng, CL; Zhang, Q; Fang, LS; Lei, XS; Lin, GQ,期刊:Helvetica Chimica Acta, 页码:626-635 , 文章类型: Article,,卷期:2012年95-4]
- A convergent approach to dibenzodioxocinones was explored, thereby racemic penicillide ((+/-)-1a) could be obtained in 13 steps in 4.2% overall yield, based on 5-amino-2-methylphenol (5) (Schemes 24).
- Sesquiterpenoids and 2-(2-Phenylethyl)-4H-chromen-4-one (=2-(2-Phenylethyl)-4H-1-benzopyran-4-one) Derivatives from Aquilaria malaccensis Agarwood
[作者:Wu, B; Lee, JG; Lim, CJ; Jia, SD; Kwon, SW; Hwang, GS; Park, JH,期刊:Helvetica Chimica Acta, 页码:636-642 , 文章类型: Article,,卷期:2012年95-4]
- The four new sesquiterpenoids 14, and the new 2-(2-phenylethyl)-4H-chromen-4-one (=2-(2-phenylethyl)-4H-1-benzopyran-4-one) derivative 5, together with the two known sesquiterpenoids 6 and 7, the five known chromenones 8...
- A New Abietane Diterpenoid from Plectranthus bishopianus BENTH.
[作者:Syamasundar, KV; Vinodh, G; Srinivas, KVNS; Srinivasulu, B,期刊:Helvetica Chimica Acta, 页码:643-646 , 文章类型: Article,,卷期:2012年95-4]
- Chemical examination of the MeOH extract of Plectranthus bishopianus Benth., a rare and endangered plant, resulted in isolation of a new abietane diterpene, 6 beta-hydroxy-7a-methoxyroyleanone (1), along with two more di...
- Cyano-Bridged 'Oximato' Complexes: Synthesis, Structure, and Catalase-Like Activities
[作者:Karipcin, F; Culu, B; Sharma, SK; Qanungo, K,期刊:Helvetica Chimica Acta, 页码:647-659 , 文章类型: Article,,卷期:2012年95-4]
- The reaction of the oximato-ligand precursor A (Fig. 1) and metal salts with KCN gave two mononuclear complexes [ML(CN)(H2O)n](ClO4) (1 and 2; L={N-(hydroxy-?O)-a-oxo-N'-[(pyridin-2-yl-?N)methyl[1,1'-biphenyl]-4-ethanimi...
- Highly cis-Diastereoselective Synthesis of Coumarin-Based 2,3-Disubstituted Dihydrobenzothiazines by Organocatalysis
[作者:Khoobi, M; Ramazani, A; Foroumadi, A; Emami, S; Jafarpour, F; Mahyari, A; Slepokura, K; Lis, T; Shafiee, A,期刊:Helvetica Chimica Acta, 页码:660-671 , 文章类型: Article,,卷期:2012年95-4]
- An efficient and organocatalyzed asymmetric reaction of phenacyl halides with coumarin-based dihydrobenzothiazoles was developed to afford cis-2,3-disubstituted 3,4-dihydro-2H-benzothiazines. This method provides a one-s...
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