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The pristine CeVO4 and CeVO4/CNT hybrid composite nanostructured samples were facilely synthesized using a simple silicone oil-bath method.From the X-ray diffra... 相似文献
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Sharma GV Subash V Reddy NY Narsimulu K Ravi R Jadhav VB Murthy US Kishore KH Kunwar AC 《Organic & biomolecular chemistry》2008,6(22):4142-4156
New C-linked carbo-beta-amino acids (beta-Caas), Cbz-(S)-beta-Caa-(NHBoc)-OMe (1) and Cbz-(R)-beta-Caa-(NHBoc)-OMe (2), with an additional amine group (methylamino group of NHBoc) at the C-1 position of the lyxofuranoside side chain and Boc-(S)-beta-Caa-(diFP)-OMe (3) and Boc-(R)-beta-Caa-(diFP)-OMe (4), with a C-difluorophenyl (diFP) moiety at the anomeric position of the lyxofuranoside side chain were prepared from D-mannose. Beta-peptides [tetra- and hexapeptides] were synthesized from these beta-Caas, 'epimeric' [at the amine stereocentre (C(beta))], using the concept of 'alternating chirality' to carry out their conformational studies [NMR (CDCl(3)), CD and MD]. In the monomer design, it was envisaged that the presence of an additional amine group in 1 or 2 would help in solubilizing the peptides in water, while, the C-difluorophenyl (diFP) moiety of 3 and 4 is expected to enhance the biological activity. The peptides having 1 and 2, though could not retain their 12-10-mixed helices in water, have shown moderate activity against gram positive and gram negative bacterial strains. The peptides prepared from 3 and 4, much against our expectations, did not display any biological activity. 相似文献
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Sharma GV Jadhav VB Ramakrishna KV Jayaprakash P Narsimulu K Subash V Kunwar AC 《Journal of the American Chemical Society》2006,128(45):14657-14668
New classes of alpha/gamma- and beta/gamma-hybrid peptides have been synthesized with novel 12/10- and 11/13-mixed helical patterns, respectively. The alpha/gamma-peptides were derived from the dipeptide repeats with alternating arrays of l-Ala and gamma-Caa((l)) (C-linked carbo-gamma-amino acid from d-mannose), which generated a new 12/10-mixed helix, for the first time, without a beta-amino acid. The beta/gamma-peptides made from an alternating arrangement of beta-Caa((x)) (C-linked carbo-beta-amino acid) and gamma-Caa((x)) (C-linked carbo-gamma-amino acid from d-xylose), on the other hand, resulted in an unprecedented 11/13-helix. The secondary structures in these peptides have been ascertained from detailed NMR studies, and CD spectroscopy and molecular dynamics investigations provided additional support for the structures derived. 相似文献
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A facile Rh(II) catalyzed reaction of diethyl diazomalonate with thietanes leading to highly substituted tetrahydrothiophenes along with allyl thioethers is described. 相似文献
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Sharma GV Reddy KR Krishna PR Sankar AR Narsimulu K Kumar SK Jayaprakash P Jagannadh B Kunwar AC 《Journal of the American Chemical Society》2003,125(45):13670-13671
The C-linked carbo-beta-peptides, oligomers of a new class of C-linked carbo-beta3-amino acids, have been shown to generate mixed 12/10 and 10/12 helices. The design involves use of "alternating chirality" of the epimeric (at the amine center) monomers to control the stability of these helices. The observation of stable 12/10 helix in a tripeptide and 10/12 helix in a tetrapeptide is unprecedented. 相似文献
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Venkatram R. Reddy Narsimulu Maripally Raghupathi Mutyala Jagadeesh Babu Nanubolu Rajesh Chandra 《Tetrahedron letters》2018,59(27):2631-2635
The hitherto unknown, organocatalysed (DMAP) vinylogous Rauhut-Currier reaction of 2,3-butadienoates with para-quinone methides has been achieved. The products, diarylmethane substituted allenoates, are formed in high to excellent yields under mild reaction conditions. 相似文献
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V.V.V.N.S. Rama Rao B.P.V. Lingaiah R. Yadla P. Shanthan Rao K. Ravikumar G.Y.S.K. Swamy K. Narsimulu 《Journal of heterocyclic chemistry》2006,43(3):673-679
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Narsimulu D. Rao B. Nageswara Nagaraju Goli Yu Jae Su Satyanarayana N. 《Journal of Solid State Electrochemistry》2020,24(1):225-236
Journal of Solid State Electrochemistry - A simple modified combustion method was demonstrated in the development of cobalt ferrite (CoFe2O4) and samarium (Sm)-doped CoFe2O4 nanostructures. The... 相似文献