排序方式: 共有33条查询结果,搜索用时 15 毫秒
11.
Valluru Krishna Reddy Lakonda Nagaprasada Rao Tatsuo Oshikawa Masaki Takahashi Mitsuji Yamashita 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6-7):1801-1806
Several novel 1-(substituted phenyl)-2-phospholene 1-oxide derivatives, which are analogs of sugars having a phosphorus atom in place of the ring oxygen of normal sugars, were synthesized from the corresponding 2-phospholenes as the starting materials. Structures of all the synthesized compounds were unequivocally confirmed by IR, 1 H, 13 C, and 31 P NMR spectral, elemental, and X-ray crystallographic analyses. 相似文献
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Gopikishore Valluru Hisham F. Sleem Florent Perret Imed Montasser Antoine Grandvoinnet 《Supramolecular chemistry》2014,26(7-8):561-568
The plasmon resonances of sulphonato-calixnaphthalene-capped silver nanoparticles have been used to study the complexation of the nanoparticles with nucleobases and amino acids. Only in the case of the nanoparticles capped with oxacalix[4]naphthalenesultone, does complexation of both nucleobases and certain amino acids occur. The complexation of the aromatic amino acids, phenylalanine and tryptophan, has previously not been observed for calixarene-capped silver nanoparticles. 相似文献
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Cyclopropyl ester (8a-f) were synthesized by the cyclopropanation of chalcones (7a-e) in dry benzene using powdered sodium in 80-85% yield. Preparation of tetralone ester (4a-e), an intermediate for the synthesis of podophyllotoxin derivatives by Lewis acid (SnCl4) catalyzed cyclization of (8a-e) is also described here. 相似文献
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Ganapathi V. Prasad T. R. Valluru K. R. Maroju S. Mule S. N. R. Guguloth V. 《Russian Journal of Organic Chemistry》2021,57(12):2048-2053
Russian Journal of Organic Chemistry - A series of novel sulfonyl urea derivatives were designed as potential anticancer agents. These compounds were prepared in good yields by the reaction of... 相似文献
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A mild, environmentally friendly method for reduction of aromatic nitro group to amine is reported, using zinc powder in aqueous solutions of chelating ethers. The donor ether acts as a ligand and also serves as a co-solvent. Water is the proton source. This procedure is also a new method for the activation of zinc for electron transfer reduction of aromatic nitro compounds. The reduction is accomplished in a neutral medium and other reducing groups remained unaffected. The ethers used are dioxolane, 1,4-dioxane, ethoxymethoxyethane, dimethoxymethane, 1,2-dimethoxyethane, and diglyme. 相似文献
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Mitsuji Yamashita Valluru Krishna ReddyLakonda Nagaprasada Rao Buchammagari HarithaMotoki Maeda Keiji SuzukiHirono Totsuka Masaki TakahashiTatsuo Oshikawa 《Tetrahedron letters》2003,44(11):2339-2341
A novel method has been developed for stereospecific conversion of 2-phospholene 1-oxides into their corresponding 2,3-epoxides in high yields using sodium peroxide as a reagent. 相似文献
17.
Paris E. Georghiou Shofiur Rahman Ahmad Alrawashdeh Abdullah Alodhayb Gopikishore Valluru Kiran Sagar Unikela 《Supramolecular chemistry》2020,32(5):325-333
ABSTRACT A new bimodal triazole-bridged pyrene-appended calix[4]arene 2g has been synthesised and characterised and complexation studies showed that the binding of Cd2+ and Zn2+ occurs as demonstrated by enhanced monomer and declining excimer emission fluorescence spectral changes. With several other metal ions, quenching of both monomer and excimer emissions occurred. The observed monomer formation in the fluorescence spectra seen with Zn2+ and Cd2+ is possibly linked not just to the diminished parallel orientations of the pyrene rings but with the magnitude of the resulting HOMO-LUMO gaps and other parameters measured by DFT calculations. 相似文献
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Cyclic ketohydrazones containing α‐methylene group are oxidized by chloramine‐T followed by treatment with triethylamine leads to the formation of azoalkenes via azochloride, which are trapped by olefinic compounds to produce fused ring pyridazine derivatives in good yield. 相似文献
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In this study, antimicrobial and antioxidant activities of the hexane extract of the root of Ventilago madraspatana were evaluated. Based on the significant bioactivity of crude hexane extract, an active compound was purified from the root extract. The active compound was further purified and identified as aromodendrin-4′-methyl ether by the 1H NMR spectrum. The isolated compound significantly inhibited Staphylococcus epidermidis with the lowest MIC and MBC at 78 μg/mL (P < 0.05). The compound also exhibited significant anticandidal activity with MIC and MBC values of 312 and 625 μg/mL, respectively. The radical scavenging activity of aromodendrin-4′-methyl ether was evident by its lower IC50 values of 60 μg/mL for DPPH scavenging and 3.2 μg/mL for ABTS scavenging. The compound also exhibited ferrous ion chelation and H2O2 scavenging activities. The study is an attempt to increase the industrial utility of V. madrasapatana. 相似文献
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