Diversity-oriented one-pot synthesis of furan based densely substituted biheteroaryls via isocyanide insertion

Copper-modified titanium dioxide nanoparticles as a highly efficient photocatalyst for the synthesis of furan-3-carboxylate derivatives

A heterogeneous photocatalyst based on copper-modified titanium dioxide nanoparticles has been prepared and characterized. Copper-modified nano-titanium dioxide (Nano-TiO2@CuO) is an efficient photocatalyst for the synthesis of furan-3-carboxylate derivatives through a radical addition-polar cyclization of β-ketoester derivatives and allyl chloride under the irradiation of blue light. Copper-modified titanium dioxide nanoparticles 20% which show titanium dioxide-copper cooperativity show a significantly better performance with respect to turnover numbers (number of product molecules per catalyst molecule = efficiency). The Nano-TiO2@CuO catalyst is stable and can be reused multiple times without a significant change in activity. The particle sizes varied in the range of 25-80 nm. High yields of product, environmentally friendly, cost-effective method, and easy work-up are advantages of the present method. All synthesized compounds were characterized by NMR and FT-IR spectroscopy.

Recent advances in the application of β-ketonitriles as multifunctional intermediates in organic chemistry

This review discusses the diverse applications of β-ketonitriles in organic synthesis, highlighting protocols that generate various compounds, including cyclic hydrocarbons, aromatic compounds, heterocycles, spirocycles, and fused heterocycles. These compounds serve as valuable building blocks for biologically active scaffolds like chromenes, quinolines, and natural products. It provides an overview of 69 research articles published from 2014 to 2023, focusing on reactions involving benzoyl acetonitrile derivatives and other β-ketonitriles. The methodologies include cascade, domino, and sequential reactions facilitated by different catalysts, showcasing the versatility of β-ketonitriles in organic chemistry.

Chemistry of 3-cyanoacetyl indoles: synthesis, reactions and applications: a recent update

Indole is a significant nitrogen-based heterocycle with particular importance in the synthesis of heterocyclic scaffolds. Indole based compounds have been recently attracting much attention due to their biological and pharmaceutical activities. 3-Substituted indoles such as cyanoacetyl indoles (CAIs) are nitrogen-heterocyclic compounds which are easily obtained from the reaction of indoles and cyanoacetic acid. They are versatile starting materials utilized for the construction of a wide variety of molecules containing indole moieties in organic synthesis. In this study, we provide an overview on the synthesis of 3-cyanoacetyl indoles (CAIs) and their recent applications in the multi-component reactions for the synthesis of various heterocyclic compounds such as pyranes, pyridines, dihydropyridines, pyrimidines, tetrahydropyrimidines, pyrazoles, pyrazolopyridines, pyrazolopyrimidines, pyridopyrimidines, tetrazolopyrimidines, triazolopyrimidines, furans, dihydrofurans, coumarins, pyrimido naphthyridines, chromenes, thiazoles, pyrimidoindazoles, pyrazoloquinolines, isoxazolopyridines, and carbazoles and their biological activities during the period of 2013 to 2022.

New efficient synthesis of benzofuro[2,3-b]pyrroles utilizing a reactive nitrilium trapping approach by an acid-promoted cascade addition/cyclization sequence

The first p-TSA·H₂O-catalyzed highly efficient one-pot cascade reaction for the synthesis of novel fused tricyclic benzofuro[2,3-b]pyrroles has been discovered.