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Pagore V.P.,Deogiri College | Rupnar B.D.,Deogiri College | Tekale S.U.,Shri Muktanand college | Pawar R.P.,Deogiri College
Der Pharma Chemica | Year: 2015

We herein report a green and efficient ammonium chloride catalyzed four component condensation of aldehyde, malononitrile, hydrazine hydrate and ethyl acetoacetate in aqueous medium to synthesize pyranopyrazoles. This method follows the principle of green chemistry by using environmentally benign synthetic method along with use of cost effective catalyst and green reaction medium. Source

Tekale S.U.,Shri Muktanand college | Kauthale S.S.,Deogiri College | Shaikh R.U.,Swami Ramanand Teerth Marathwada University | Pawar R.P.,Deogiri College
Journal of the Iranian Chemical Society | Year: 2014

A green and atom-efficient one-pot protocol for the synthesis of some novel α-aminophosphonates using micron-particulate AlN/Al as a new reusable heterogeneous catalyst by the Kabachnik-Fields reaction under solvent-free conditions has been developed. The synthesized α-aminophosphonates were screened for several biological activities. They all were investigated to exhibit moderate to promising antioxidant, anti-inflammatory and cytotoxic properties. © 2013 Iranian Chemical Society. Source

Kauthale S.S.,Deogiri College | Tekale S.U.,Shri Muktanand college | Jadhav K.M.,Deogiri College | Pawar R.P.,Deogiri College
Molecular Diversity | Year: 2016

An ethylene glycol promoted catalyst-free practically efficient and sustainable approach has been developed for the synthesis of several benzylidene-bis-(4-hydroxycoumarin)s and 4,4 ′-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s by the pseudo three-component reaction of an aldehyde with 4-hydroxycoumarin and 3-methyl-1-phenylpyrazol-5-one, respectively. Inexpensive, non-toxic, and easily available ethylene glycol used as the reaction solvent and promoter renders an efficient protocol in terms of catalyst-free reaction conditions, short reaction time, high yield, practical utility, and green approach. © 2016, Springer International Publishing Switzerland. Source

Tekale S.U.,Shri Muktanand college | Kauthale S.S.,Deogiri College | Jadhav K.M.,Deogiri College | Pawar R.P.,Deogiri College
Journal of Chemistry | Year: 2013

An efficient zinc oxide nanoparticle catalyzed one-pot, four-component synthesis of 6-amino-3-methyl-5-cyano-4-aryl-1,4-dihydropyrano[2,3-c]pyrazoles from aromatic aldehyde, malononitrile, ethyl acetoacetate, and hydrazine hydrate in aqueous medium is described. Since water was employed as the reaction medium, it serves as a green route for the synthesis of pyrano[2,3-c]pyrazoles. The advantages associated with the present protocol include nonchromatographic purification technique, use of recyclable heterogeneous nano-ZnO catalyst in aqueous medium, and short reaction time. It combines successfully the synergistic effect of green chemistry with nanocatalysis. © 2013 Sunil U. Tekale et al. Source

Tekale S.U.,Shri Muktanand college | Pagore V.P.,Shri Muktanand college | Kauthale S.S.,Deogiri College | Pawar R.P.,Deogiri College
Chinese Chemical Letters | Year: 2014

Lanthanum oxide (La2O3) in combination with 2,2,2-trifluoroethanol (TFE) was found to be an efficient system for the one-pot, four-component synthesis of Hantzsch polyhydroquinoline derivatives from aromatic aldehydes, dimedone, ethyl acetoacetate and ammonium acetate at ambient temperature. The catalyst is heterogeneous and reusable, hence can be separated easily and reused. The present method is featured by mild reaction conditions, use of heterogeneous catalyst, non-chromatographic purification, short reaction time and high yields, which make it an attractive route for the synthesis of polyhydroquinolines. © 2014 Rajendra P. Pawar. Source

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