- Oleanane-Type Triterpenoids from Glochidion assamicum
[作者:Liu, XQ; Huang, HL; Yao, MJ; Han, GT; Liu, N; Yuan, JC; Yuan, CS,期刊:Helvetica Chimica Acta, 页码:2264-2271 , 文章类型: Article,,卷期:2011年94-12]
- Phytochemical analysis of the extract of the leaves and twigs of Glochidion assamicum led to the isolation of four new oleanane-type triterpenoids, 21 beta-(benzoyloxy)olean-12-ene-3 beta,16 beta,23,28-tetraol (1), 21 be...
- Polyhydroxypregnane Glycosides from the Roots of Cynanchum otophyllum
[作者:Ma, LF; Shan, WG; Zhan, ZJ,期刊:Helvetica Chimica Acta, 页码:2272-2282 , 文章类型: Article,,卷期:2011年94-12]
- Six new polyhydroxypregnane glycosides, namely cynotophyllosides AF (16), together with five known steroids, were isolated from the roots of Cynanchum otophyllum. Their structures were elucidated by extensive spectroscop...
- Baeckeins A and B, Two Novel 6-Methylflavonoids from the Roots of Baeckea frutescens
[作者:Jia, BX; Yang, J; Chen, XQ; Cao, Y; Lai, MX; Wang, Q,期刊:Helvetica Chimica Acta, 页码:2283-2288 , 文章类型: Article,,卷期:2011年94-12]
- A pair of novel isomeric 6-methylflavonoids, named baeckeins A (1) and B (2), were isolated from the roots of Baeckea frutescens. The two compounds possess a unique C23 skeleton, resulting from the 6-methylation and 8-ar...
- Diversity-Oriented Synthesis of Novel 2 '-Aminospiro[11H-indeno[1,2-b]quinoxaline-11,4 '-[4H]pyran] Derivatives via a One-Pot Four-Component Reaction
[作者:Hasaninejad, A; Golzar, N; Shekouhy, M; Zare, A,期刊:Helvetica Chimica Acta, 页码:2289-2294 , 文章类型: Article,,卷期:2011年94-12]
- A sequential one-pot four-component reaction for the efficient synthesis of novel 2'-aminospiro[11H-indeno[1,2-b]quinoxaline-11,4'-[4H]pyran] derivatives 5 in the presence of AcONH4 as a neutral, inexpensive, and dually ...
- New and Bioactive Sesquiterpenes from Schisandra sphenanthera
[作者:Mendbayar, K; Lo, IW; Liaw, CC; Lin, YC; Fazary, AE; Kuo, YC; Wang, HJ; Chiang, BH; Liou, SS; Shen, YC,期刊:Helvetica Chimica Acta, 页码:2295-2302 , 文章类型: Article,,卷期:2011年94-12]
- Three new sesquiterpenes, schisansphenins A (1) and B (2) and (-)-?-cuparenol (3), were isolated from an acetone extract of the fruits of Schisandra sphenanthera. The known compound 4 was isolated for the frist time from...
- Stereo-Inversion in the (4R)-gamma-Decanolactone Synthesis by Saccharomyces cerevisiae: (2E,4S)-4-Hydroxydec-2-enoic Acid Acts as a Key Intermediate
[作者:Kohler, G; Evans, P; Garbe, LA,期刊:Helvetica Chimica Acta, 页码:2125-2140 , 文章类型: Article,,卷期:2011年94-12]
- Methyl (2E,4R)-4-hydroxydec-2-enoate, methyl (2E,4S)-4-hydroxydec-2-enoate, and ethyl (+/-)-(2E)-4-hydroxy[4-2H]dec-2-enoate were chemically synthesized and incubated in the yeast Saccharomyces cerevisiae. Initial C-chai...
- Diastereoselective Alkyl Grignard 1,4-Additions to para-Substituted (2R)-N-Cinnamoylbornane-10,2-sultam Derivatives: Influence of N-Atom Pyramidalization
[作者:Piatek, AM; Sadowska, A; Chapuis, C; Jurczak, J,期刊:Helvetica Chimica Acta, 页码:2141-2167 , 文章类型: Article,,卷期:2011年94-12]
- Several typical 13C-NMR displacements (of C=O, C(a), C(beta), and C(ipso)), as well as conformational or energy properties (S-N-C=O dihedral angle, Delta E syn/anti; HOMO/LUMO) could be correlated with the electronic par...
- Kinetics and Mechanism of Certain Acetylation Reactions with Acetamide/Oxychloride in Acetonitrile under Vilsmeier?Haack Conditions
[作者:Venkateswarlu, M; Kumar, MS; Ramgopal, S; Rajanna, KC; Kumar, UU; Uppalaiah, K; Saiprakash, PK,期刊:Helvetica Chimica Acta, 页码:2168-2187 , 文章类型: Article,,卷期:2011年94-12]
- Vilsmeier?Haack (VH) acetylation reactions with benzaldehydes or acetophenones in MeCN followed second-order kinetics and afforded acetyl derivatives under kinetic conditions, irrespective of the nature of the oxychlorid...
- Click Synthesis' of 1H-1,2,3-Triazolyl-Based Oxiconazole (=(1Z)-1-(2,4-Dichlorophenyl)-2-(1H-imidazol-1-yl)ethanone O-[(2,4-Dichlorophenyl)methyl]oxime) Analogs
[作者:Rad, MNS; Asrari, Z; Behrouz, S; Hakimelahi, GH; Khalafi-Nezhad, A,期刊:Helvetica Chimica Acta, 页码:2194-2206 , 文章类型: Article,,卷期:2011年94-12]
- The click synthesis of some oxiconazole analogs 5a5v having 1H-1,2,3-triazolyl residues by Huisgen cycloaddition was achieved in four steps (Scheme 1). Oximation of phenacyl chloride (1) followed by azidation of 2-chloro...
- Three New E-Secoursane Triterpenoid Saponins from the Leaves of Ilex dunniana
[作者:Zhang, Y; Li, LJ; Zhang, P; Pi, HF; Ruan, HL; Wu, JZ,期刊:Helvetica Chimica Acta, 页码:2207-2214 , 文章类型: Article,,卷期:2011年94-12]
- Three new triterpenoid saponins with an 18,19-secours-13(18)-ene skeleton, dunnianaolactones AC (13, resp.), together with nine known compounds i.e., the ursane-type triterpene saponin 4, the two benzofuran lignans 5 and...
- Total Synthesis of (-)-Cleistenolide
[作者:Babu, DC; Ashalatha, K; Rao, CB; Jondoss, JPS; Venkateswarlu, Y,期刊:Helvetica Chimica Acta, 页码:2215-2220 , 文章类型: Article,,卷期:2011年94-12]
- An efficient and short total synthesis of (-)-cleistenolide (1) from D-mannitol with an overall yield of 23.6% is described. The chiron approach for the synthesis of (-)-cleistenolide involves a one-C-atom Wittig olefina...
- Synthesis of Ring A-Modified Baicalein Derivatives
[作者:Wang, JF; Ding, N; Zhang, W; Wang, P; Li, YX,期刊:Helvetica Chimica Acta, 页码:2221-2230 , 文章类型: Article,,卷期:2011年94-12]
- Baicalein, an important active constituent of the traditional Chinese herb Scutellaria baicalensis, exhibited antitumor activity and inhibitory activity against P-gp 170. The syntheses of 25 baicalein derivatives, 226 (T...
- Isoprenoids and Flavonoids with Antimicrobial Activity from Ficus conraui Warburg (Moraceae)
[作者:Kengap, RT; Kapche, GDWF; Dzoyem, JP; Simo, IK; Ambassa, P; Sandjo, LP; Abegaz, BM; Ngadjui, BT,期刊:Helvetica Chimica Acta, 页码:2231-2238 , 文章类型: Article,,卷期:2011年94-12]
- A new triterpene, conrauidienol (1), and a new dihydroflavonol, conrauiflavonol (2), along with beta-amyrin acetate (3), betulinic acid (4), ursolic acid (5), 6 beta-hydroxystigmasta-4,22-dien-3-one (6), 8-prenylapigenin...
- Huangqiyenins G-J, Four New 9,10-Secocycloartane (=9,19-Cyclo-9,10-secolanostane) Triterpenoidal Saponins from Astragalus membranaceus Bunge Leaves
[作者:Kuang, HX; Wang, QH; Yang, BY; Wang, ZB; Okada, Y; Okuyama, T,期刊:Helvetica Chimica Acta, 页码:2239-2247 , 文章类型: Article,,卷期:2011年94-12]
- Four new 9,10-secocycloartane (=9,19-cyclo-9,10-secolanostane) triterpenoidal saponins, named huangqiyenins GJ (14, resp.), were isolated from Astragalus membranaceus Bunge leaves. The acid hydrolysis of 14 with 1M aqueo...
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