Regioselective synthesis and molecular docking studies of functionalized imidazo [1,2-a]pyridine derivatives through MCRs.

A efficient protocol has been developed for the synthesis of regioselective imidazo[1,2-a]pyridine and imidazo[1,2-a]pyrimidine derivatives through cascade reaction between 2-aminopyridine, arylelglyoxal, and 4-hydroxypyran via three-component reaction to prepare targeted compounds with good to excellent yields. The advantages of this transformation are a catalyst-free reaction, green solvent, operationally simple, scalable, and eco-friendly. The product collects with simple filtration which avoided tedious and expensive purification techniques. In addition, computational studies like molecular docking were conducted to provide the theoretical possibilities of binding these types of synthesized compounds to the VEGFR2 receptors as potential key inhibitors of tumor cell growth and angiogenesis.

A one-pot ring-closure and ring-opening sequence for the cascade synthesis of dihydrofurofurans and functionalized furans.

We have developed a simple novel ring-closure and ring-opening pathway using an organo-base system for the synthesis of highly substituted dihydrofurofuran and furan frameworks via a triethylamine-catalyzed one-pot three-component reaction. The protocol involved a Knoevenagel and Michael adduct via Paal-Knorr cyclization with aromatic/aliphatic glyoxal and 2-cyanoacetophenone under mild and heating conditions with excellent yields through a simple filtration method. The merits of this methodology, including the use of easily available feedstocks and an inexpensive catalyst, Gram-scale synthesis, wide functional group tolerance, an open-air reaction setup, and no need for workup and column-chromatography procedures, make the developed methodology a practical way to access dihydrofurofurans and functionalized furans.