排序方式: 共有13条查询结果,搜索用时 31 毫秒
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Jian Liu Tianying Jian Liangqin Guo Tzvetomira Atanasova Ravi P. Nargund 《Tetrahedron letters》2009,50(37):5228-6459
A general method for the preparation of various 3,4-fused-spiro[furan-5(5H),4′-piperidin]-2-one with high yield is reported. The formation of spiro[furanone-piperidine] structure was achieved by a Suzuki coupling, followed by an iodolactonization reaction. 相似文献
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Shuwen He Peng Li Xing Dai Hong Liu Zhong Lai Dong Xiao Casey C. McComas Chunyan Du Yuehui Liu Jingjun Yin Qun Dang Nicolas Zorn Xuanjia Peng Ravi P. Nargund Anandan Palani 《Tetrahedron letters》2017,58(14):1373-1375
We report a general approach for the synthesis of 5,6-dihydroindolo-naphthyridine ring system via an intramolecular cyclization of the indole NH to an alkene moiety as the key step. 相似文献
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Shuwen He C. Scott Shultz Zhong LaiRonsar Eid Peter H. DobbelaarZhixiong Ye Ravi P. Nargund 《Tetrahedron letters》2011,52(28):3621-3624
Asymmetric hydrogenation of achiral spiroindene dimethyl acetic acid 2 with 4% of Ru(II)-Mandyphos in acetone produced (S)-spiroindane dimethyl acetic acid 1 in 86% isolated yield and 96.8:3.2 enantiomeric ratio. 相似文献
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Gulamnabi L. Vanti Vijendra B. Nargund Basavesha K. N Rajinikanth Vanarchi Mahantesh Kurjogi Sikandar I. Mulla Suresh Tubaki Rajashekar R. Patil 《应用有机金属化学》2019,33(1)
Malvaceae and Brassicaceae family crops are economically important; however, their production has been markedly decreased in recent years due to various plant pests. Hence, the search for novel classes of efficient biological approaches continues due to unavailability of precise pesticides. The present study was designed to synthesize, characterize and evaluate the efficacy of silver nanoparticles (AgNPs) obtained using stem extract of Gossypium hirsutum (cotton plant) against plant pathogens Xanthomonas axonopodis pv. malvacearum and Xanthomonas campestris pv. campestris. Biosynthesized AgNPs were characterized using UV–visible spectrophotometry, Dynamic Light Scattering, Scanning Electron Microscopy combined with energy‐dispersive X‐ray analysis and Fourier transform infrared spectroscopy. The synthesized AgNPs were spherical in shape with size ranging from 20 to 100 nm. The characterized AgNPs were investigated for their efficacy against bacterial plant pathogens using the paper disc method. In vitro studies with two concentrations of AgNPs (50 and 100 μg mL?1) showed zone of inhibition 11.0 ± 1.0 and 12.3 ± 0.5 mm for X. axonopodis pv. malvacearum and 9.7 ± 0.6 and 15.33 ± 1.0 mm for X. campestris pv. campestris. Furthermore, the AgNPs exhibited strong antioxidant activity, and a phytotoxicity study on Vigna unguiculata (cowpea plant) showed no toxicity. Overall, the findings suggest that G. hirsutum stem extract could be efficiently used in the synthesis of AgNPs and showed antimicrobial activity against plant pathogens. Hence, the synthesized nanoparticles could be used to combat plant pathogens in the agriculture sector. 相似文献
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Chunhui Huang Cannon B. Wille Huaibing He Vijay Bhasker Gangula Reddy Ravi P. Nargund Songnian Lin Anandan Palani 《Tetrahedron letters》2017,58(12):1219-1222
The late-stage modification of native peptides to alter and/or enhance their properties and functions is attractive but formidably challenging. Peptide lipidation is one of the effective strategies to overcome short half-life and rapid clearance. Herein, we report a late-stage installation of a fatty acid lipid onto fully elaborated peptides, using glucagon as an example, through regio- and chemoselective functionalization of tryptophan with high potency and remarkable in vivo half-life extension. 相似文献
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Shuwen He Zhong Lai David X. Yang Qingmei Hong Mikhail Reibarkh Ravi P. Nargund William K. Hagmann 《Tetrahedron letters》2010,51(33):4361-4364
We report an efficient method for the synthesis of β-carbolines from α-siloxy α,β-unsaturated esters, which are accessible from a variety of aldehydes and ketones. 相似文献