Navi Mumbai, India
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Takale S.,akur Research Center | Manave S.,akur Research Center | Phatangare K.,akur Research Center | Padalkar V.,akur Research Center | And 3 more authors.
Synthetic Communications | Year: 2012

An efficient and practical protocol for the preparation of 5-substituted 1H-tetrazole derivatives is reported using phosphomolybdic acid as an effective heterogeneous catalyst. Good yields, simple methodology, and easy workup make this protocol more attractive for the diversity-oriented synthesis of these heterocycle libraries. The catalyst can be recycled three times with good yields. © 2012 Taylor and Francis Group, LLC.


Chaskar A.,akur Research Center | Chaskar A.,Polytechnic of Milan | Vyavhare V.,akur Research Center | Padalkar V.,akur Research Center | And 2 more authors.
Journal of the Serbian Chemical Society | Year: 2011

A phosphomolybdic acid catalysed novel method for the synthesis of 1,2-dihydro-1-aryl-3H-naphth[1,2-e][1,3]oxazin-3-one derivatives by a one-pot, three-component reaction of β-naphthol, aromatic aldehydes and urea in excellent yields is described. © 2011 Copyright (CC) SCS.


Chaskar A.C.,akur Research Center | Yadav A.A.,Institute of Science | Langi B.P.,akur Research Center | Murugappan A.,akur Research Center | Shah C.,Bhabha Atomic Research Center
Synthetic Communications | Year: 2010

Simple, efficient, and mild method for -thiocyanation of ketones in presence of heteropolyacid has been developed. This methodology offered -oxothiocyanates in good to excellent yields at room temperature in a highly selective manner. The catalyst could be efficiently recovered from the reaction and reused. © 2010 Taylor & Francis Group, LLC.


Takale S.,akur Research Center | Parab S.,akur Research Center | Phatangare K.,akur Research Center | Pisal R.,akur Research Center | Chaskar A.,National Taiwan University
Catalysis Science and Technology | Year: 2011

Iodoxy benzoic acid (IBX) used as an effective catalyst for the synthesis 3,4-dihydropyrimidine-2(1H)-ones (DHPMs) via the Biginelli reaction in water. The immobilized catalyst could be easily recovered by simple filtration and recycled without significant decrease of the catalytic activity. © 2011 The Royal Society of Chemistry.


Deokar H.,akur Research Center | Chaskar J.,C K Thakur College | Chaskar A.,akur Research Center | Chaskar A.,National Taiwan University
Journal of Heterocyclic Chemistry | Year: 2014

A series of novel oxadiazino/thiadiazino-indole and oxadiazole/thiadiazole derivatives of 2-oxo-2H-benzopyran were synthesized and evaluated for their antimicrobial activities against the bacteria Staphylococcus aureus, Salmonella typhi, and Escherichia coli and two fungal species Candida albicans and Aspergillus niger. The antibacterial activities were expressed as minimum inhibitory concentration (MIC50) in microgram per milliliter. The title compounds 4b and 10b revealed promising antibacterial activity whereas 6d, 7d, 9d, and 10b exhibited significantly impressive antifungal activity. © 2013 HeteroCorporation.


Padalkar V.,Institute of Chemical Technology | Phatangare K.,Institute of Chemical Technology | Takale S.,akur Research Center | Pisal R.,akur Research Center | Chaskar A.,National Taiwan University
Journal of Saudi Chemical Society | Year: 2015

4-Hydroxy coumarin on electrophilic substitution reaction with carbonyl compound in the presence of heterogeneous catalysts (NaHSO4·SiO2/Indion 190 resin) offers bis-(4-hydroxycoumarin-3-yl) methanes in good to excellent yields. © 2011.

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