Quinoline or 1-aza-naphthalene is a weak tertiary base. Quinoline ring has been found to possess antimalarial, anti-bacterial, antifungal, anthelmintic, cardiotonic, anticonvulsant, anti-inflammatory, and analgesic activity. Quinoline not only has a wide range of biological and pharmacological activities but there are several established protocols for the synthesis of this ring. The article aims at highlighting these very diversities of the ring.

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Pyrazoline is an important five membered nitrogen heterocycle, which has been extensively researched upon. The ring is quite stable and has inspired chemists to carry out various structural variations in the ring. This has propelled the development of distinct pyrazolines with an array of pharmacological activities viz. anti-inflammatory, analgesic, antimicrobial, anticancer, antidepressant etc. The review aims at highlighting this pharmacological diversity of pyrazolines. The review is a gist of latest work done describing the pharmacological aspects and potential of pyrazoline ring.

The development of novel compounds, hydrazones has shown that they possess a wide variety of biological activities viz. antimicrobial, anticonvulsant, antidepressant, anti-inflammatory, analgesic, antiplatelet, antimalarial, anticancer, antifungal, antitubercular, antiviral, cardio protective etc., Hydrazones/azomethines/imines possess-NHN = CH- and constitute an important class of compounds for new drug development. A number of researchers have synthesized and evaluated the biological activities of hydrazones. This review aims at highlighting the diverse biological activities of hydrazones.