TY - JOUR ID - 104935 TI - Co3O4/NiO@GQDs@SO3H nanocomposite as an effective catalyst for the synthesis of pyranopyridines JO - Nanochemistry Research JA - NCR LA - en SN - 2538-4279 AU - Shahbazi-Alavi, Hossein AU - Kareem Abbas, Ali AU - Safaei-Ghomi, Javad AD - Young Researchers and Elite Club, Kashan Branch, Islamic Azad University, Kashan, Iran AD - College of applied medical sciences, University of kerbala, Iraq AD - Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran Y1 - 2019 PY - 2019 VL - 4 IS - 2 SP - 154 EP - 162 KW - Nanocomposite KW - One-pot KW - Heterogeneous catalysts KW - pyranopyridines KW - nanoanalysis DO - 10.22036/ncr.2019.02.007 N2 - Co3O4/NiO@GQDs@SO3H nanocatalyst has been used as an effective catalyst for the preparation of benzopyranopyridines through a four-component reaction of salicylaldehydes, thiols and 2 equiv of malononitrile under reflux condition in ethanol. The catalyst has been characterized by FT-IR, XRD, SEM, EDS, BET, XPS, TGA and VSM. Atom economy, reusable catalyst, low catalyst loading, applicability to a wide range of substrates and high yields of products are some of the notable features of this method. The best results were gained in EtOH and we found that the reaction gave convincing results in the presence of Co3O4/NiO@GQDs@SO3H nanocomposite (4 mg) under reflux conditions. A series of salicylaldehydes and different thiols were studied under optimum conditions.We also determined recycling of Co3O4/NiO@GQDs@SO3H nanocomposite as catalyst for the model reaction under reflux conditions in ethanol. The results showed that nanocomposite can be reused several times without noticeable loss of catalytic activity (Yields 90 to 88%) UR - http://www.nanochemres.org/article_104935.html L1 - http://www.nanochemres.org/article_104935_2c3f980cb67e3c3684a7227ff4466897.pdf ER -