Epoxidation of alkenes is a significant reaction in organic chemistry due to its opportunities in producing compounds of biochemical interest. Catalytic epoxidation with first‐row transition elements has gained attention in the latest years wherein manganese based catalysts stand superior by satisfying numerous principles of green chemistry. In this review, we have summarized the recent developments in olefin epoxidation using homogeneous manganese catalysts. Manganese complexes with porphyrin, Schiff base, salen, and other non‐heme ligands made efficient catalytic systems during the last five years. Notably, we witnessed greener approaches in recent reports wherein photo‐catalysis is a promising strategy. We anticipate that the review will benefit the researchers to get a better understanding of the reaction and to choose the best catalysts for their reactions.

The synthesis of heterocyclic compounds has been a hot topic for several decades. Synthetic organic chemists are always in search of new methodologies which are greener for the synthesis of heterocyclic compounds. The ultrasound‐assisted reactions have contributed much to this field. This review focuses on the impact of sonochemistry in the synthesis of heterocyclic compounds and covers the literature from 2009 to 2020.

Transition-metal catalysed C-H activations are efficient, simple, mild, cost-effective, stereo selective and many of them are environmentally sustainable transformations. These were the dominant reasons which consistently inspired scientists to explore...

Imidazothiazoles and its derivatives have vital role in medicinal chemistry as they exhibit biological activities such as anti‐tumor, anti‐cancer, anti‐inflammatory, antibacterial, analgesic etc. This review summarises the various methodologies used to synthesise imidazothiazoles, its derivatives and applications covering literature upto 2020 and it emphasizes the synthesis of imidazothiazoles from 2‐aminothiazole, mercaptoimidazole and imidazothiadiazole.