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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
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Lingam Venkata Reddy Mamatha Nakka Alishetty Suman Soumen Ghosh Madeleine Helliwell Khagga Mukkanti Alok Kumar Mukherjee Sarbani Pal 《Journal of heterocyclic chemistry》2011,48(3):555-562
Reduction of nimesulide followed by treating the N‐acyl derivative of resulting arylamine with Vilsmeier‐Haack reagent provided novel 2‐chloro‐3‐formylquinoline derivatives. The construction of quinoline ring using Vilsmeier‐Haack reagent afforded an unexpected compound, N‐(2‐chloro‐3‐formyl‐7‐phenoxy quinolin‐6‐yl)formamide, in addition to the expected product. The structure of this unexpected quinoline derivative was established via single‐crystal X‐ray analysis and its formation could be explained by an unprecedented N‐S bond cleavage under Vilsmeier‐Haack reaction conditions. The 2‐chloro‐3‐formylquinoline derivatives obtained were converted to a number of corresponding Schiff bases with potential pharmacological importance. J. Heterocyclic Chem., 2011. 相似文献
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Ramu Tadikonda Mangarao Nakka Mahaboob Basha Gajula Srinuvasarao Rayavarapu Padma Rao Gollamudi 《合成通讯》2014,44(13):1978-1986
Silica-supported perchloric acid (HClO4-SiO2) was found to be a new, highly efficient, inexpensive, and reusable catalyst for a rapid and efficient synthesis of various 1,2,4-oxadiazoles with good to excellent yields under solvent-free conditions. The present methodology has been effectively utilized for the synthesis of oxolamine, an anti-inflammatory drug. 相似文献
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Pasupulet Siva Nageswara RAO Kasanneni Tirumala Venkateswara RAO Potharaju S. SAI PRASAD Nakka LINGAIAH 《催化学报》2011,32(11):1719-1726
A series of 12-molybdophosphoric acid (MPA) supported on V2O5 dispersed γ-Al2O3 catalysts with different vanadia loadings were prepared by impregnation and characterized by N2 adsorption-desorption,X-ray diffraction,temperature-programmed reduction,in situ laser Raman spectroscopy,UV-Vis diffused reflectance spectroscopy,scanning electron microscopy,and temperature-programmed desorption of NH3 techniques.Their catalytic activities were evaluated for the vapor phase aerobic oxidation of benzyl alcohol.The catalysts exhibited high catalytic activity and the conversion of benzyl alcohol depended on the vanadia content while the catalyst with 15 wt% V2O5 content showed optimum activity.The characterization results suggest the presence of well-dispersed V2O5 and partially disintegrated Keggin ions of MPA on the support.In situ Raman studies showed a reduced Mo(IV) species when the catalysts were calcined at high temperatures.The high oxidation activity of the catalysts is related to the synergistic effect between MPA and V2O5. 相似文献
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Rajesh Gopinath Nakka Lingaiah I. Suryanarayana Potharaju S. Sai Prasad 《Reaction Kinetics and Catalysis Letters》2003,79(1):61-68
Catalysts containing 10 wt. % Pd supported on Nb2O5 were prepared by microwave irradiation and conventional electrical heating, using palladium chloride as the precursor for
Pd. Whereas higher residual chloride content decreased the activity and stability of the microwave irradiated catalyst, formation
of PdO during calcination in air improved the performance of the conventionally heated catalyst. Calcination after microwave
irradiation offers the highest activity and stability.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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Lingam Venkata Reddy Mohan Kethavath Mamatha Nakka Syed Sultan Beevi Lakshmi Narasu Mangamoori Khagga Mukkanti Sarbani Pal 《Journal of heterocyclic chemistry》2012,49(1):80-87
Functionalization of quinoline aldehydes, derived from nimesulide framework was carried out using Morita–Baylis–Hillman (MBH) chemistry. A number of novel quinoline‐based diverse MBH adducts was prepared via the reaction of derivatives of 2‐chloroquinoline‐3‐carbaldehyde and various activated alkenes in good yields. Many of these compounds were found to be potent when tested against human prostate cancer (Pc‐3) cell line in vitro. Among all the compounds tested N‐(2‐chloro‐3‐(2‐cyano‐1‐hydroxyallyl)‐7‐phenoxyquinolin‐6‐yl)formamide (IC50 = 1.2 μg mL?1) was identified as the most potent compound in this series. J. Heterocyclic Chem., (2012). 相似文献
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Rajeswara Rao Nakka Venkatappa Rao Thumu Ramana Reddy SVS Sanjeeva Rao Buddhiraju 《辐射效应与固体损伤》2013,168(5):439-450
We have investigated the effects of gamma irradiation on chemical structure, thermal and morphological properties of biodegradable semi-crystalline poly (glycolic acid) (PGA). PGA samples were subjected to irradiation treatment using a 60Co gamma source with a delivered dose of 30, 60 and 90?kGy, respectively. Gamma irradiation induces cleavage of PGA main chains forming ~O?H2 and ?H2COO~ radicals in both amorphous and crystalline regions. The free radicals formed in the amorphous region abstract atmospheric oxygen and convert them to peroxy radicals. The peroxy radical causes chain scission at the crystal interface through hydrogen abstraction from methylene groups forming the ~?HCOO~ (I) radical. Consequently, the observed electron spin resonance (ESR) doublet of irradiated PGA is assigned to (I). The disappearance of the ESR signal above 190°C indicates that free radicals are formed in the amorphous region and decay below the melting temperature of PGA. Fourier transform infrared and optical absorption studies confirm that the groups are not influenced by gamma irradiation. Differential scanning calorimetry (DSC) studies showed that the melting temperature of PGA decreased from 212°C to 202°C upon irradiation. Degree of crystallinity increased initially and then decreased with an increase in radiation as per DSC and X-ray diffraction studies. Irradiation produced changes in the physical properties of PGA as well as affecting the morphology of the material. 相似文献
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