Development of novel transition metal-catalyzed synthetic approaches for the synthesis of a dihydrobenzofuran nucleus: a review

The synthesis of dihydrobenzofuran scaffolds bears pivotal significance in the field of medicinal chemistry and organic synthesis. These heterocyclic scaffolds hold immense prospects owing to their significant pharmaceutical applications as they are extensively employed as essential precursors for constructing complex organic frameworks. Their versatility and importance make them an interesting subject of study for researchers in the scientific community. While exploring their synthesis, researchers have unveiled various novel and efficient pathways for assembling the dihydrobenzofuran core. In the wake of extensive data being continuously reported each year, we have outlined the recent updates (post 2020) on novel methodological accomplishments employing the efficient catalytic role of several transition metals to forge dihydrobenzofuran functionalities.

Electrosynthesis of 5-Aminocoumaran Derivatives from Olefins and Aminophenols

The electrochemical synthesis of 5-aminocoumaran derivatives from easily oxidizable aminophenols and readily available olefins is described. The reaction efficiently produces 5-aminocoumarans in high yield under mild and environmentally friendly conditions without the necessity of catalysts, additives, oxidizing agents, or sacrificial reagents. Hydrogen as the sole byproduct of the reaction makes the method clean, highly atom-efficient, and step-economical.

Site-selective rhodium carbene transfer of 2 hydroxy-β-nitrostyrenes with diazo compounds En route to 2-alkylated benzofurans

The Rh(iii)-catalysed cascade vinylic C–H functionalization/carbene transfer/Michael addition sequence of 2-hydroxy-β-nitrostyrenes has been realized, delivering the 2-alkylated benzofuran derivatives as potential tyrosinase inhibitors.