A novel method for the synthesis of substituted 3,4-dihydrocoumarin derivatives via isocyanide-based three-component reaction

Isocyanide-based multicomponent reactions for the synthesis of benzopyran derivatives with biological scaffolds

Benzopyrans (BZPs) are among the most privileged and influential small O-heterocycles that form the core of many natural compounds, commercial drugs, biological compositions, agrochemicals, and functional materials. BZPs are divided into six general categories including coumarins, chromans, 2H-chromenes, 4H-chromenes, chromones, and 4-chromanones, each of which is abundant in many plants and foods. These oxygenated heterocyclic compounds are fascinating motifs and have extensive applications in biology and materials science. Hence, numerous efforts have been made to develop innovative approaches for their extraction and synthesis. However, most of them are step-by-step or multi-step strategies that suffer from waste material generation and a tedious extraction process. Isocyanide-based multicomponent reactions (I-MCRs) offer a highly efficient method for overcoming these problems. The I-MCR is a simple and environmentally friendly one-pot domino procedure that does not require intermediate isolation or workup and is generally more efficient in material usage. This review covers all research articles related to I-MCRs for synthesizing BZP derivatives from the beginning to the middle of the year 2023. This strategy will be useful for organic and pharmaceutical chemists to design new drugs and optimize the synthesis steps of biological compounds and commercial drugs with benzopyran cores.

Isocyanide and Meldrum's acid-based multicomponent reactions in diversity-oriented synthesis: from a serendipitous discovery towards valuable synthetic approaches

Multicomponent reactions, which lead to synthesis of target compounds with inherent molecular diversity, greater efficiency and atom economy, are single step types of reactions made from three or more reactants attract the attention of all chemists.

Synthesis and biological evaluation of coumarin derivatives as inhibitors of Mycobacterium bovis (BCG)

The coumarin compounds are an important class of biologically active molecules, which have attractive caught the attention of many organic and medicinal chemists, due to potential pharmaceutical implications and industrial applications. We herein report the one-pot procedure for the efficient synthesis of coumarin derivatives using commercially available substrates via isocyanide-based multicomponent condensation reactions. These compounds were evaluated for anti-mycobacterium activity against Mycobacterium bovis (Bacillus Calmette-Guerin). The preliminary results indicated that all of the tested compounds showed relatively good activity against the test organism. The compounds 7e, 7l, and 7m showed high anti-tuberculosis activity.