2-Pyrazolines as Biologically Active and Fluorescent Agents, An Overview

Nitrogen-containing five-membered heterocyclics play a vital role in pharmaceuticals as well as medicinal chemistry. Pyrazolines play a significant role among other heterocycles because of their therapeutic and pharmacological properties. 2-Pyrazolines displayed a wide variety of biological activities such as anticancer, antiepileptic, anti-aids, antimalarial, insecticidal, antitubercular, etc. and they are used as pesticides, herbicides, fungicides and also used in agrochemical research and analytical chemistry. 2-Pyrazolines are well-known brightening agents used in chemosensor. They have excellent fluorescent properties and are widely used in synthetic fibers, dyes, photography and hole transporting materials. A number of preparation methods of pyrazolines have also been investigated by several research groups. In this review, most of the synthesized and reported nitrogen-containing five-membered heterocycles including 2-pyrazolines, their pharmaceutical evaluation and structure-reactivity are discussed.