Vol.:(0123456789) 1 3 Journal of the Iranian Chemical Society https://doi.org/10.1007/s13738-020-02069-9 ORIGINAL PAPER Magnetite (Fe 3 O 4 ) nanoparticles‑supported dodecylbenzenesulfonic acid as a highly efcient and green heterogeneous catalyst for the synthesis of substituted quinolines and 1‑amidoalkyl‑2‑naphthol derivatives Deepak Katheriya 1  · Nipun Patel 1  · Harsh Dadhania 2  · Abhishek Dadhania 1 Received: 14 June 2020 / Accepted: 18 September 2020 © Iranian Chemical Society 2020 Abstract Magnetically retrievable, magnetite (Fe 3 O 4 ) nanoparticles-supported dodecylbenzenesulfonic acid (DDBSA@MNP) was synthesized and characterized through diferent analytical techniques such as TEM, XRD, FTIR, TGA, SEM, EDX and VSM. The catalytic efciency of synthesized DDBSA@MNP was evaluated for the synthesis of substituted quinolines and 1-amidoalkyl-2-naphthols through one-pot condensation. The methodology provides a facile approach for the synthesis of targeted compounds with excellent isolated yields. Additionally, the catalyst can be recovered through external magnet and reused up to fve reaction cycles with prominent reactivity. The present approach ofers many advantages such as green and mild reaction condition, facile catalyst recovery and excellent isolated yield of fnal products. Graphic abstract Keywords Magnetic nanoparticles · Heterogeneous catalyst · One-pot condensation · Friedlander reaction Introduction Homogeneous catalysts have been known for several years due to their distinct features such as high activity and selec- tivity [1–3]. Homogeneous nature of the catalyst renders all catalytic sites available for the reactants and also provides the stereo- and regioselectivity to the reaction [4]. How- ever, homogeneous catalysts contribute not more than 15% of the industrial processes as compared to its counterpart heterogeneous catalysts [5]. The reason behind this trend is difculties associated with their separation and reusability. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13738-020-02069-9) contains supplementary material, which is available to authorized users. * Abhishek Dadhania abhishekdadhania.bt@charusat.ac.in 1 Department of Chemical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology (CHARUSAT), Changa, Gujarat 388421, India 2 Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar 388120, Gujarat, India