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New weapons are constantly needed in the fight against cancer. The discovery of cisplatin as an anticancer drug prompted the search for new metal complexes. The successful history of cisplatin motivated chemists to develop a plethora of metal-based molecules. Among them, metal-N-heterocyclic carbene (NHC) complexes have gained significant attention because of their suitable qualities for efficient drug design. The enhanced applications of coinage metal-NHC complexes have encouraged a gradually increasing number of studies in the fields of medicinal chemistry that benefit from the fascinating chemical properties of these complexes. This review aims to present recent developments in synthetic strategies and medicinal applications of copper, silver and gold complexes supported by NHC ligands., (© 2020 Wiley-VCH GmbH.)

Chalcones are a fascinating and well‐studied group of organic molecules. Synthesis of chalcones has been one of the essential areas of organic synthesis over the last few decades because of their immense therapeutic and excellent photophysical properties. Furthermore, these chalcone derivatives can be utilized to make a variety of heterocyclic compounds, especially five‐ and six‐membered heterocycles. Heterocyclic compounds have a long history in chemistry, primarily in pharmaceuticals. However, synthesizing some specific heterocyclic molecules remains challenging and requires multistep processes with few possible intermediates. Chalcones can be considered as one of the most useful, readily available intermediates in heterocyclic synthesis. Herein, the synthesis of various potential heterocyclic compounds using chalcones as an intermediate is elaborated. This review shows the untapped potential of chalcones in organic synthesis. Also, it will assist the chemist in designing new heterocycles by adopting these strategies. [ABSTRACT FROM AUTHOR]

A new series of 2-{4-[2-(N-methyl-2-pyridylamino)ethoxy]phenyl}-5-substituted 1,3,4-oxadiazoles were synthesized by the oxidative cyclization of hydrazones derived from 4-[2-(methylpyridin-2-ylamino)ethoxy]benzaldehyde and aryl hydrazines using chloramine-T as an efficient catalyst. All steps were assisted by microwave irradiation. Microwave enables all these reactions to be simple, rapid, high yielding, and avoid chromatograph purification and led environmentally benign total synthesis of focused oxadiazole library. All the synthesized compounds were isolated in good yield and characterized by 1H NMR, 13C NMR, and elemental analyses. The title compounds represent a novel class of biologically active heterocycles. [ABSTRACT FROM AUTHOR]

Cyclic ketohydrazones containing α-methylene group are oxidized by chloramine-T followed by treatment with triethylamine leads to the formation of azoalkenes via azochloride, which are trapped by olefinic compounds to produce fused ring pyridazine derivatives in good yield. [ABSTRACT FROM AUTHOR]