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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19条记录   Enantioselective synthesis of beta-blockers via hydrolytic kinetic resolution of terminal oxiranes by using bimetallic chiral {{2,2 '-[Cyclohexane-1,2-diylbis(nitrilomethylidyne)]bis[phenolato]}(2-)}cobalt ([Co(salen)])-type complexes [作者：Kawthekar, RB; Kim, GJ,期刊：Helvetica Chimica Acta, 页码：317-332 , 文章类型： Article，,卷期：2008年91-2] The synthesis of chirally pure beta-blockers was successfully achieved via hydrolytic kinetic resolution of butyl (+/-)-4-(oxiran-2-ylmethoxy)benzeneacetate ((+/-)-1) and (+/-)-4-(oxiran-2-ylmethoxy)benzene-acetonitrile ... Two novel abeo-dammaranes with a six-membered acetal moiety from Aglaia perviridis HIERN [作者：Yang, SM; Tan, CH; Lun, HF; Wang, DX; Zhu, DY,期刊：Helvetica Chimica Acta, 页码：333-337 , 文章类型： Article，,卷期：2008年91-2] Two novel triterpenoids, named (20S,24S)-20,24-epoxy-24-methoxy-23(24 -> 25)abeo-dammaran-3-one (=(20S,25S)-20,25-epoxy-25-methoxy-24,24-dimethyl-26,27-dinordammaran-3-one; 1), (3 alpha,20S,24S)-20,24-epoxy-24-methoxy-23... Pteridines - Part CXIX - A new pteridine-purine transformation [作者：Pfleiderer, W,期刊：Helvetica Chimica Acta, 页码：338-353 , 文章类型： Article，,卷期：2008年91-2] A variety of pyrimidine precursors 12-25 were converted into a series of new 7-hydroxylumazines (=7-hydroxypteridine-2,4(1H,3H)-diones) 26-35 which functioned as starting materials for the transformation into the corresp... New approaches to the synthesis of 4-(2-aminophenyl)-1,3-dihydro-2H-imidazol-2-ones and 3-ureidoindoles and a study of their interconversion [作者：Klasek, A; Lycka, A; Holcapek, M; Hoza, I,期刊：Helvetica Chimica Acta, 页码：354-370 , 文章类型： Article，,卷期：2008年91-2] 3-Alkyl/aryl-3-ureido-1H,3H-quinoline-2,4-diones (2) and 3a-alkyl/aryl-9b-hydroxy-3,3a,5,9b-tetrahydro-1H-imidazo [4,5-c] quinoline-2,4-diones (3) react in boiling concentrated HCl to give 5-alkyl/aryl-4-(2-aminophenyl)-... Stereoselective total synthesis of natural (S)-bakuchiol and its enantiomer [作者：Du, XL; Chen, HL; Feng, HJ; Li, YC,期刊：Helvetica Chimica Acta, 页码：371-378 , 文章类型： Article，,卷期：2008年91-2] A practical stereoselective synthesis of (S)-bakuchiol (1) and its enantiomer is reported. The important intermediate, (R)-configured beta-siloxy aldehyde 5, was obtained in three steps from the easily available material... Unusual loss of substituents in the course of cyclization of tetrahydrobilines to dihydroporphyrins [作者：Damke, JE; Latos-Grazynski, L; Montforts, FP,期刊：Helvetica Chimica Acta, 页码：177-186 , 文章类型： Article，,卷期：2008年91-2] Metallo-tetrahydrobiline rac-8 was prepared to investigate its cyclization directed to the formation of N-confused chlorins. To achieve the site-directed selectivity of the cyclization, the 2-position of rac-2 was activa... Synthesis of 3-aminotropones from N-Boc-protected furan-2-amine (= tert-butyl furan-2-ylcarbamate; Boc = (tert-butoxy)carbonyl) by cycloaddition reactions and subsequent rearrangement [作者：Montana, AM; Barcia, JA; Kociok-Kohn, G; Font-Bardia, M; Solans, X,期刊：Helvetica Chimica Acta, 页码：187-208 , 文章类型： Article，,卷期：2008年91-2] The 3-aminotropones (= 3-aminocyclohepta-2,4,6-trien-1-ones) 4 were prepared in two steps by i) a [4+3] cycloaddition reaction between a conveniently substituted alpha,alpha'-dihalo ketone 1 and a furan-2-amine derivativ... Selenium-containing heterocycles from isoselenocyanates: 4-methylselenazole derivatives from the reaction with malononitrile and propargyl chloride [作者：Sommen, GL; Linden, A; Heimgartner, H,期刊：Helvetica Chimica Acta, 页码：209-219 , 文章类型： Article，,卷期：2008年91-2] Aryl isoselenocyanates 1 react with malononitrile (6a) and propargyl chloride (8) in DMF in the presence of Et3N to give the corresponding 2-(3-aryl-2,3-dihydro-4-methyl-1,3-selenazol-2-ylidene)malononitriles 12 as major... Heteroclitins N-Q, new compounds from stems of Kadsura heteroclita (ROXB.) CRAIB [作者：Xu, LJ; Liu, HT; Peng, Y; Chen, SB; Chen, SL; Xiao, PG,期刊：Helvetica Chimica Acta, 页码：220-226 , 文章类型： Article，,卷期：2008年91-2] From the stems of Kadsura heteroclita (ROXB.) CRAIB, a new novel C-19 homolignan, heteroclitin N (1), as well as three new lignans, heteroclitins O-Q (2-4), were isolated. Their structures were elucidated based on spectr... One-pot four-component synthesis of tetrasubstituted pyrroles [作者：Kassaee, MZ; Masrouri, H; Movahedi, F; Partovi, T,期刊：Helvetica Chimica Acta, 页码：227-231 , 文章类型： Article，,卷期：2008年91-2] A convenient one-pot four-component synthesis of tetrasubstituted pyrroles was carried out through the reaction of butane-2,3-dione with alpha-aminophosphorous ylides, obtained in situ from the 1 :1 :1 addition reaction ... Synthesis of optically active 1-(1-phenylethyl)-1H-imidazoles derived from 1-phenylethylamine [作者：Mloston, G; Mucha, P; Urbaniak, K; Broda, K; Heirngartner, H,期刊：Helvetica Chimica Acta, 页码：232-238 , 文章类型： Article，,卷期：2008年91-2] The three-component reaction of (R)- or (S)-1-phenylethylamine (6), formaldehyde, and an alpha-(hydroxyimino) ketone 5, i.e., 3-(hydroxyimino)butan-2-one (5a) or 2-(hydroxyimino)-1,2-diphenylethanone (5b), yields the cor... Three new monoterpenoid indole alkaloids from Ervatamia flabelliformis [作者：Liang, SA; Chen, HS; Shen, YH; Zhang, WD; Jin, YS; Liu, RH,期刊：Helvetica Chimica Acta, 页码：239-243 , 文章类型： Article，,卷期：2008年91-2] The three new monoterpenoid indole alkaloids 1-3 were isolated from the stems of Ervatamia flabelliformis. The structures were elucidated on the basis of spectral analysis and chemical derivatization. Two new steroidal alkaloids from Veratrum nigrum L. [作者：Wang, B; Zhang, WD; Shen, YH; Tang, J; Zhang, C; Liu, RH; Lin, M; Li, HL,期刊：Helvetica Chimica Acta, 页码：244-248 , 文章类型： Article，,卷期：2008年91-2] Phytochemical studies on Veratrum nigrum L., collected in Shanxi, P. R. China, resulted in the isolation of two new steroidal alkaloids, 23-methoxycyclopamine (1) and 15-O-(2-methylbutanoyl)-3-O-veratroylprotoverine (2).... A biomimetic synthesis of sacculatane diterpenoids [作者：Grinco, M; Kulcitki, V; Ulgur, N; Vlad, PF; Gavagnin, M; Castelluccio, F; Cirnino, G,期刊：Helvetica Chimica Acta, 页码：249-258 , 文章类型： Article，,卷期：2008年91-2] The biomimetic synthesis of sacculatane-type epimeric compounds 14a and 14b is reported. The key synthetic step is the low-temperature superacidic cyclization of (all-E)-omega-acetoxygeranylgeraniol 12 obtained in nine s... Copper-free Sonogashira coupling of acid chlorides with terminal alkynes in the presence of a reusable palladium catalyst: An improved synthesis of 3-iodochromenones (=3-iodo-4H-1-benzopyran-4-ones) [作者：Likhar, PR; Subhas, MS; Roy, M; Roy, S; Kantam, ML,期刊：Helvetica Chimica Acta, 页码：259-264 , 文章类型： Article，,卷期：2008年91-2] Pd/C is used as an efficient catalyst for the copper-free Sonogashira coupling of acid chlorides and terminal alkynes to afford ynones in high yields (Tables 1 and 3). Cyclization of (2-methoxyaryl)-substituted ynones in... A novel route to 1-substituted 3-(dialkylamino)-9-oxo-9H-indeno[2,1-c]-pyridine-4-carbonitriles [作者：Landmesser, T; Linden, A; Hansen, HJ,期刊：Helvetica Chimica Acta, 页码：265-284 , 文章类型： Article，,卷期：2008年91-2] Heptalenecarbaldehydes 1/1' as well as aromatic aldehydes react with 3-(dicyanomethylidene)-indan-1-one in boiling EtOH and in the presence of secondary amines to yield 3-(dialkylamino)-1,2-dihydro-9-oxo-9H-indeno[2,1-c]...