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Chinese Chemical Letters 2008年第7期19卷 775-779页

作者： cherkupally sanjeeva reddy Mekala Raghu Department of Chemistry Kakatiya UniversityWarangal 506009India

A general and convenient practical approach for the synthesis of polyhydroquinoline derivatives has been achieved via one-pot four-component Hantzsch condensation of aromatic aldehydes, dimedone, ethyl acetoacetate and ammonium acetate in the presence of a catalytic amount of cerium（IV） ammonium nitrate （CAN）, in ethanol solvent at ambient temperature. Simple work-up, mild reaction conditions, inexpensive and non-toxic catalyst, and excellent product yields are the advantageous features of this method.

关键词： Aldehydes Dimedone Ethyl acetoacetate Ammonium acetate CAN Polyhydroquinolines

Synthesis of some new N,N'-diarylsubstituted methylene-bis-dihydro-2H-1,3-benzoxazines

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Chinese Chemical Letters 2008年第12期19卷 1407-1410页

作者： cherkupally sanjeeva reddy Mekala Raghu Department of Chemistry Kakatiya UniversityWarangal 506009India

The synthesis of a new series of six-membered N,N′-diarylsubstituted methylene-bis-dihydro-2H-1,3-benzoxazines （5a-e） was achieved in excellent yields by Mannich-type condensation of N,N′-diarylsubstituted methylene-bis-o-hydroxybenzyl amines （4a- e） with formaldehyde in chloroform at reflux. These amines （4a-e） were obtained by the reduction of N, Nr-diarylsubstituted methylene-bis-o-hydroxybenzyl imines （3a-e） with NaBH4, which inturn were obtained by the condensation of methylene-bissalicylaldehyde （2） with various substituted arylamines.

关键词： Methylene-bis-salicylaldehyde Marmich-type condensation Methylene-bis-1,3-benzoxazines

Knoevenagel condensation of α,β-unsaturated aromatic aldehydes with barbituric acid under non-catalytic and solvent-free conditions

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Chinese Chemical Letters 2007年第12期18卷 1431-1435页

作者： cherkupally sanjeeva reddy Adki Nagaraj Department of Chemistry Kakatiya UniversityWarangal 506009India

An efficient route for the synthesis of 5-（arylpropenylidine）-2,4,6-pyrimidinetrione 3 from an appropriate α,βunsaturated aromatic aldehydes 1 and barbituric acid 2 under both non-catalytic and solvent-free microwave irradiation conditions was described. In this way, a range of biologically important compounds 3 was obtained in good to excellent yields （86-98%） in a very short reaction time （30-80 s）.

关键词： Barbituric acid Knoevenagel condensation 5-(Arylpropenylidine)-2,4,6-pyrimidinetrione

Zirconyl chloride promoted highly efficient solid phase synthesis of amide derivatives

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Chinese Chemical Letters 2007年第10期18卷 1213-1217页

作者： cherkupally sanjeeva reddy Adki Nagaraj Pochampally Jalapathi Department of Chemistry Kakatiya UniversityWarangal 506009India

An efficient solid phase route for the synthesis of amide derivatives by the reaction of carboxylic acids with urea in the presence of catalytic amount of zirconyl chloride under microwave irradiation conditions was described. In this way, a range of interesting amide derivatives was obtained in good to excellent yields. The catalyst was recycled with fresh reactants and it gave almost similar results without significant loss of activity up to the third run.

关键词： Carboxylic acids Urea Zircony chloride Solid phase Amides Recyclable catalyst

Synthesis of some new 3-[5-(2-oxo-2H-3-chromenyl)-1,3-oxazol-2-yl]-1,3-thiazolan-4-ones as antimicrobials

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Chinese Chemical Letters 2010年第9期21卷 1045-1048页

作者： cherkupally sanjeeva reddy L.sanjeeva Rao M.Vani Devi G.Rajesh Kumar A.Nagaraj Department of Chemistry Kakatiya University Department of Pharmaceutical Chemistry Telangana University

A series of some new 2-imino-5-[（Z）-1-（4-methylphenyl）methylidene]-3-[5-（2-oxo-2H-3-chromenyl）-1,3-oxazol-2-yl]-1,3- thiazolan-4-ones 5a-j has been synthesized and assayed for their antibacterial activity against Gram-positive bacteria *** subtilis（ATCC 6633）,Staphylococcus aureus（ATCC 6538p） and Micrococcus luteus（IFC 12708）,and Gram-negative bacteria viz. Proteus vulgaris（ATCC 3851）.Salmonella typhimurium（ATCC 14028） and Escherichia coli（ATCC 25922）.Among the screened compounds,5d,5e,5f,5g,and 5j exhibited potent inhibitory activity compared to standard drug,and emerged as potential molecules for further development.

关键词： 1,3-Thiazolan-4-ones 2-Oxo-2H-chromenyl 1,3-Oxazolyl Antibacterial activity

ZrOCl2 Catalysed Chemoselective Conversion of Aldehydes to geminal-Diacetates and Their Cleavage： A Mild and Efficient Method

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Chinese Journal of Chemistry 2007年第10期25卷 1555-1558页

作者： NAGARAJ, Adki sanjeeva reddy, cherkupally Department of Chemistry Kakatiya University Warangal-506 009 India

ZrOCl2 was found to be an effective Lewis acid catalyst for the solventless chemoselective conversion of aldehydes into geminal-diacetates in high yields at room temperature. Regeneration of the aldehydes from the acetals was also achieved using the same catalyst in water. The beneficial effect of microwave irradiation on the reaction was also described. Other advantages are the very low loading of catalyst, high yields achieved even on a gram scale, and considerably shortened reaction time compared to the conventional method.

关键词： zirconium oxychloride acetal chemoselective microwave irradiation