排序方式: 共有24条查询结果,搜索用时 31 毫秒
1.
Russian Journal of Organic Chemistry - A simple and efficient protocol has been described for the synthesis of [1,2,4]triazolo[4,3-a]pyridines and 3,5-disubstituted-1,2,4-oxadiazoles by... 相似文献
2.
Sowbhagya Lakshmi Matcha Bharat Kumar Karasala Sathish Mohan Botsa Siddaiah Vidavalur 《Journal of heterocyclic chemistry》2021,58(10):1955-1961
A simple and efficient Brønsted acid catalyzed synthesis of 2-aryl-quinazolinones via cyclization of 2-aminobenzamides with benzonitrile in PEG under metal and ligand-free condition. All substituted benzonitriles were also well participated with the formation of the corresponding products in moderate to good yields. 相似文献
3.
Somepalli Venkateswarlu Gandrotu Narasimha Murty Meka Satyanarayana Vidavalur Siddaiah 《Journal of heterocyclic chemistry》2021,58(12):2324-2333
A novel series of aurones were designed by introducing sulfonic acid group on ring-A and ring-B of known natural aurones such as hispidol, sulfuretin, maritimetin, and aureusidin. These sulfonated aurones were synthesized by a unique approach. Sulfonation on ring-A or ring-B converts water-insoluble aurones into highly water-soluble aurones. The sulfonated aurones were tested for their antioxidant, antiinflammatory, and AChE inhibition activities along with their natural aurones. Ring-A sulfonated aurones displayed higher antioxidant activity, 5-LOX, and AChE inhibition in comparison with their corresponding natural aurones. Ring-B sulfonated aurones exhibited potent 5-LOX inhibitory activity and significant antioxidant activity. Acidoaurone, a first sulfonated aurone isolated from Phyllanthus acidus was synthesized for the first time and was well characterized using NMR, LC–MS, and further confirmed by HMBC. 相似文献
4.
Kumar K. Santhosh Siddaiah V. Lilakar J. D. Sunanda K. Ganesh A. 《Russian Journal of Organic Chemistry》2020,56(11):2014-2021
Russian Journal of Organic Chemistry - An efficient and simple continuous-flow synthetic protocol for novel quinoline-tethered pyrazoline derivatives, which involves condensation of... 相似文献
5.
Nakka Mangarao Gajula Mahaboob BashaTadikonda Ramu Rayavarapu SrinuvasaraoSarakula Prasanthi Vidavalur Siddaiah 《Tetrahedron letters》2014
A facile and highly efficient synthesis of 3,4,5-trisubstituted 1,2,4-triazoles and 3,5-disubstituted 1,2,4-oxadiazoles from 2,2,2-trichloroethyl imidates using PEG as a solvent and employing PTSA as the catalyst under mild conditions is described. 相似文献
6.
Suresh E. Kurhade Sudhir RavulaV. Siddaiah Debnath BhuniyaD. Srinivasa Reddy 《Tetrahedron letters》2011,52(33):4313-4315
A convenient one-step method for the synthesis of novel dihydrooxazine and oxazoline based sugar hybrids is reported starting from the readily accessible sugar azides and aldehydes. We have used Aubé’s protocol to achieve this transformation. The resulting glycoconjugates could be used to increase the diversity on the sugar backbone and may find applications as potential glycomimetics and in drug discovery. 相似文献
7.
Somepalli Venkateswarlu Meka Satyanarayana Gandrothu Narasimha Murthy Vidavalur Siddaiah 《Tetrahedron letters》2012,53(21):2643-2646
Cyclisation of 2-(2-aminophenyl)quinazolin-4(3H)-ones on to N3 and on to N1 leading to 6-alkyl-(8H)-quinazolino[4,3-b]quinazolin-8-one and 6-alkyl-(13H)-quinazolino[3,4-a]quinazolin-13-one, respectively was described for the first time. The differences in the IR and carbon NMR data of these isomeric fused quinazolinoquinazolinones afford a useful method for distinguishing between the two series. 相似文献
8.
Maheswara M Koteswara Rao Y Siddaiah V Venkata Rao C Somayajulu KV Tyan Lin F 《Chemical & pharmaceutical bulletin》2004,52(8):974-975
Two new 5-deoxyflavonoids, 7,2',3',4'-tetramethoxyflavone (1) and 7,2',3',4'-tetramethoxyflavanone (2) together with a known flavone 7,4'-dimethoxy-3'-hydroxyflavone (3) were isolated from the whole plant of Calliandra inermis. The structures of these new compounds were elucidated by high resolution electron impact mass spectrometry (HR-EI-MS) and 1D and 2D-NMR spectral studies including 1H-1H correlation spectroscopy (COSY), heteronuclear single quantum coherence (HSQC), heteronuclear multiple bond connectivity (HMBC) and nuclear Overhauser enhancement spectroscopy (NOESY). 相似文献
9.
A general and single step synthesis of polyhydroxydihydrochalcones from the readily available phenols and dihydrocinnamic acids using BF3·Et2O is described. The method allows the synthesis of a wide range of compounds with multiple phenolic hydroxyls and other substituents. These dihydrochalcones are converted into homoisoflavonoids by DMF/PCl5 and the methodology has been applied to the synthesis of naturally occurring phloretin and 5,7-dihydroxy-3-[(4-hydroxyphenyl)methyl]-4H-chromen-4-one. The antioxidant activity of dihydrochalcones and homoisoflavonoids was determined by superoxide free radical (NBT) and DPPH free radical scavenging methods. Polyhydroxydihydrochalcones 3c, 3f, 3g and homoisoflavonoids 4c, 4f, 4g displayed excellent antioxidant activity. 相似文献
10.
Rao G. Padma Mohan B. Sathish Siddaiah V. 《Russian Journal of Organic Chemistry》2020,56(11):2028-2031
Russian Journal of Organic Chemistry - The first stereoselective total synthesis of the linear pentaketide Modiolin has been performed via Jacobsen’ hydrolytic kinetic resolution and... 相似文献