K. L. Ameta received his doctorate degree in organic chemistry from M. L. Sukhadia University, Udaipur, India. He is assistant professor of chemistry in the Faculty of Arts, Science and Commerce, Mody Institute of Technology and Science, Deemed University, Lakshmangarh, Rajasthan, India. His research area is the synthesis, characterization, and biological evaluation of bioactive heterocyclic systems of different sizes. In addition, he has keen interest in heterogeneous catalyzed organic synthesis and photocatalysis. He has published a number of research articles in various journals of national and international repute.Andrea Penoni is assistant professor in organic chemistry at the Department of Science and High Technology at the University of Insubria, Italy. He received a PhD from the University of Milan. He did his postdoctoral training at the University of Milan, and at the University of Oklahoma, where he studied annulation reactions between nitro- and nitrosoaromatics with alkynes. Since 2003, he has been a faculty member at the University of Insubria (Como). His research is particularly focused on the synthesis of heterocycles, naturally occurring compounds, and potentially bioactive molecules. He is also involved in research projects on the carbon-nitrogen bond formation mediated by metals and metal complexes and in the synthesis of nitrogen-containing heterocycles by metathesis reactions.

• Synthesis of Bioactive Heterocyclic Systems Promoted by Silica-Supported Catalysts. Eco-Benign Synthesis of Indole Derivatives Employing Diverse Heterogeneous Catalysts. Solid Heterogeneous Catalysts Based on Sulfuric Acid and Transition-Metal Salts: Synthesis of Bioactive Heterocycles. Heterogeneous Copper-Catalyzed Synthesis of Bioactive Heterocycles. Silica Sulfuric Acid: A Simple and Powerful Heterogeneous Catalyst in Organic Synthesis. Application of Silica-Based Heterogeneous Catalysis for the Synthesis of Bioactive Heterocycles. Application of Organometallic Compounds as Heterogeneous Catalysts in Organic Synthesis. Ultrasound: An Efficient Tool for the Synthesis of Bioactive Heterocycles. Nano-Zinc Oxide: An Efficient Heterogeneous Catalyst for the Synthesis of Heterocyclic Compounds. Application of Heterogeneous Catalysts for the Synthesis of Bioactive Coumarins. Silver: A Versatile Heterogeneous Catalyst for Heterocyclic Synthesis. Mesoporous Materials from Novel Silica Source as Heterogeneous Catalyst.