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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18条记录   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... Photo-Cross-Linking of Polymethacrylates with Stilbene Chromophores in the Side Chains [作者：Jahnke, A; Beile, B; Meier, H,期刊：Helvetica Chimica Acta, 页码：2111-2124 , 文章类型： Article，,卷期：2011年94-12] Methacrylates (=2-methylpropenoates) 5 with (E)-stilbene (=(E)-1,2-diphenylethene) building blocks on tethers of variable length were prepared (Scheme 2) and polymerized (i.e., 5 -> 6; Scheme 3) in the presence of AIBN (... 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... An Efficient Synthesis of Optically Active trans-(3R,4R)-3-Acetoxy-4-aryl-1-(chrysen-6-yl)azetidin-2-ones Using (+)-Car-3-ene as a Chiral Auxiliary [作者：Shaikh, AL; Esparza, O; Banik, BK,期刊：Helvetica Chimica Acta, 页码：2188-2193 , 文章类型： Article，,卷期：2011年94-12] An efficient enantioselective synthesis of 3-acetoxy trans-beta-lactams 7a and 7b via [2+2] cycloaddition reactions of imines 4a and 4b, derived from a polycyclic aromatic amine and bicyclic chiral acid obtained from (+)... 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...