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Realizing the importance of polyhydroquinoline derivatives, severalsynthesis methods have been reported, like conventional heating [7],refluxing in acetic acid [8] and microwave irradiation [9] and ultrasound[10]. Different other approaches for the syntheses of polyhydroquinolinederivatives using various catalysts, such as TMSCl [11], ionic liquids[12,13], L-proline [14], polymers [15], Yb(OTf)3[16], Sc(OTf)3[17],HClO4¨CSiO2[18], cerric ammonium nitrate [19], heteropoly acid [20],p-TSA [21], HY-zeolite [22] and Mont. K10 [23] have also been reportedand some of the methods are associated with several shortcomingssuch as long reaction times, expensive reagents, harsh reaction condi-tions, low-product yields and the use of large quantity of volatile organic solvents.

In recent years, heterogeneous catalysts are gaining more impor-tance due to environmental and economic factors. The efficiency canbe improved by using nanosized catalysts because of their small sizeand large surface to volume ratio. It has been observed that Ni0-nanoparticles as catalysts offer great attention for a wide range of appli-cations in organic transformations such as chemo-selective oxidativecoupling of thiols [24], reduction of aldehydes and ketones [25¨C27], hy-drogenation of olefins [28] and support for hydrogen adsorption [29].Recently, the progress in the field of solvent-free reactions is gainingsignificance because of their high efficiency, operational simplicity andenvironmentally benign processes. The multi-component reactions are powerful tools in the modern drug discovery process and allow fast, automated and high throughput generation of organic compounds.The possibility of performing multi-component reactions undersolvent-free conditions with a heterogeneous catalyst could enhancetheir efficiency from an economic as well as an ecological point of view.

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