Heterocyclic systems are defined by the integration of one or more heteroatoms within a cyclic framework and serve as the structural foundation for a vast array of natural products, clinical pharmaceuticals, and advanced functional materials. This work examines the synthetic landscape of heterocycles, prioritizing the development of robust methodologies, mechanistic insights, and late- stage modifications. Given their pervasive role in modulating anticancer, antimicrobial, and anti- inflammatory and many other pathways, these scaffolds remain central to medicinal chemistry. By elucidating the intricate interplay between chemical architecture and pharmacological efficacy, this study promotes the thought process to the rational design of next- generation therapeutic agents.

• Bridges the gap by integrating both chemical and biological aspects of heterocycles in a cohesive and comprehensive manner. • Serves as a valuable resource for researchers, students, and professionals who need focused insights into heterocyclic chemistry and its applications in biology.

• Offers new perspectives on how these compounds influence or can be influenced by biological systems, and how they may be utilized in fields of drug design and development.

• Illustrates the importance of the ring size of heterocyclic compounds and heteroatoms involved with its biological applications.

• Attracts the scientific community because of the biological evaluation and significance of various chiral and achiral heterocycles along with chemical strategies.

Devalina Ray has received her PhD in chemistry from Indian Institute of Technology Kharagpur, India. She has done her postdoctoral research at the University Texas Medical Branch, USA, and the University of Nebraska Medical Centre, USA, followed by Myongji University and Hanyang University, South Korea. Thereafter, Dr. Ray continued her research at the Department of Chemistry, Indian Institute of Technology, Delhi, as a Research Associate and Young Scientist. She started her independent career as a faculty in Amity University, Noida, India, nine years ago and is continuing as Associate Professor at present.

Dr. Ray taught various courses of chemistry, biology, and biostatistics to more than 800 undergraduate, postgraduate, and PhD students. The students made excellent comments on her teaching and reasoning skills. At present, she is supervising five PhD students among which one has been awarded PhD recently. She has also guided more than 100 BSc, BTech, MSc, and MTech students in their research work during in- house internship which further led to few international publications.

Dr. Ray has been pursuing independent research on synthetic organic chemistry, green chemistry, medicinal and natural product chemistry, and C– H activation and drug development. She has authored numerous significant international publications in reputed journals, such as ACS, RSC, Wiley, Springer, Elsevier, CRC, and Bentham Sciences, on complex synthetic organic chemistry with mechanistic analysis along with its application in bio- evaluation. She has published international and national patents and copyright. Many of her book chapters have been published with De Gruyters, Elsevier, Springer, CRC Taylor and Francis, and Cambridge publishers. She has also edited a book in Springer Nature. The current two volumes of books on chemistry and biology of heterocycles by CRC are considered to be highly significant. She has guest edited the special issue of Current Organocatalysis, Bentham Sciences.

Dr. Ray has been awarded “Bentham Ambassador” from Bentham Sciences. She is the Fellow of Indian Chemical Society, affiliate member of Royal Society of Chemistry, and a lifetime member of Chemical Research Society of India. She has completed three research grants from Govt of India, such as DST, SERB, and DRDO, and is presently continuing with UP CST grant as PI. She has received the best “Flash Presentation Award” from ACS Publications (ACS Omega) in an international conference (RTCS- OBC). She has also received “Outstanding Researcher in Chemistry” award in VISTA 2022 from Venus International Foundation, Chennai, India. She has been invited as distinguished speaker in various international and national conferences where she has also served as a judge for oral and poster presentation session. She is an editorial board member in few journals of Bentham Sciences. Importantly, she has been invited to serve as the Chief Editor and Founder of a few journals. She has been the reviewer for many international journals such as The Green Chemistry, The Chemical Record, Chemistryselect, Molecular Diversity, Chemistry: An Asian Journal, and many more. She has been invited by major publishers to edit, author, and contribute book chapters.

Bimal Krishna Banik pursued his high school, undergraduate, graduate, and doctoral degrees at Debipur Station High School, Bejoy Narayan Mahavidyalaya, Burdwan University, and Indian Association for the Cultivation of Science. Thereafter, he conducted postdoctoral studies at Case Western Reserve University and Stevens Institute of Technology. He became a Tenured Full Professor and the First President’s Endowed Professor at the University of Texas- Pan American (UTPA) in 2007. Moreover, Dr. Banik was an Adjunct Professor at the University of Texas, San Antonio, and also at the University of Texas Health Science Center, San Antonio. He served as the Vice- President of Research and Education Development at the Community Health Systems of Texas. Currently, he is a Professor of Natural Sciences (Deanship of Research Development), Prince Mohammad Bin Fahd University, Kingdom of Saudi Arabia.

Professor Banik has contributed significantly in all areas of higher education (teaching, advising, mentoring, research, academic service, and administration). Because of his excellent performances, Dr. Banik has received dozens of challenging awards on teaching, advising, mentoring, research, and overall recognition at the university, state, national, and international levels. Professor Banik taught organic/ medicinal chemistry as well as specialized topics in chemistry/ chemistry for engineering/ introductory chemistry courses to BS, MS, and PhD class students in the USA and Kingdom of Saudi Arabia universities for many years. Importantly, his brilliant teaching skills were admired and supported in several thousand students’, peers’, and administrators’ outstanding written evaluations as well as by exemplary independent comments posted on the “Rate My Professor” website by the US students. In addition, Dr. Banik mentored approximately 300 undergraduates and graduate students/ high school teachers/ high school students, 20 postdoctoral fellows, 7 PhD research scientists, and 28 university/ college faculties in his research activities. Importantly, he acted as the Advisor of two students’ organizations at the University of Texas that had 1400 students belonging to various disciplines.

Professor Banik’s many students successfully pursued higher degrees and education at premier institutes in USA, such as Harvard University, MIT, Yale University, Stanford University, North Western University, Rutgers University, University of Texas at San Antonio, Stevens Institute of Technology, New York State University, New Jersey Institute of Technology, University of Texas M.D. Anderson Cancer Center, Baylor College of Medicine, University of Texas at Austin, University of Texas South Western Medical University, and many others. A significant number of his students worked as university professors/ medical doctors and director/ principal scientists of chemical and drug companies.

Dr. Banik carried out research on synthetic chemistry, medicinal chemistry, and pre- clinical science. These included cancers, antibiotics, drug discovery, hormones, catalysis, green chemistry, natural products, metal- and salts- mediated reactions, mechanisms of chemical and clinical processes, physico- chemical principles, and microwave- induced reactions. As the Principal Investigator (PI) and Director, he was awarded research grants worth of US$7.25 million from the most prestigious and highly competitive USA National Institutes of Health, USA National Cancer Institute, and USA Private Research Foundations. Importantly, Professor Banik has about 780 peer- reviewed publications (USA patents, papers, reviews, books, book chapters, name reactions, and perspectives) and about 545 presentation abstracts. These abstracts included his 150 presentations at the American Chemical Society National Meetings and 120 keynote/ plenary/ distinguished international lectures. He has also published 35 books as author/ editor (Springer Nature, Springer, Nova, Elsevier, CRC Taylor and Francis, Indian Chemical Society, Cambridge Publishing House, De Gruyter, and Prince Mohammad Bin Fahd University). Remarkably, Dr. Banik is the author of 205 book chapters. The citations of his publications are more than 12,600.

Dr. Banik served as the PI of a Green Chemistry Conference between the USA and India. He chaired 20 symposiums at the American Chemical Society (ACS) National Meetings and many conferences at the national and international levels, including one at the Nobel Prize Celebration. He introduced more than 300 speakers, being a Chair of these symposiums. He served as a Reviewer of 93, Editorial Board Member of 31, Editor- in- Chief of 9, Founder of 5, Associate Editor of 9, and Guest Editor of 10 international journals. As the Editor- in- Chief, he recruited approximately 200 associate editors, guest editors, and editorial board members globally. He was an evaluator of NSF, NIH- NCI, NRC, DOE, ACS, and international grant applications; reviewer of promotion and tenure of faculties of USA and international universities; chairman of the Faculty Research Council and Faculty Promotion/ Evaluation Committee of the University of Texas- Pan American; examiner of doctoral thesis; and panel member of NSF/ NCI/ NIH grant sections. Over the years, he continued as the Chair/ Member of more than 80 scientific and academic committees. Professor Banik was the Chair of the University of Texas M.D. Anderson Cancer Center’s Drug Discovery Symposiums and directed their USA National Cancer Institute- funded Core Research Laboratory.

The diverse remarkable accomplishments of Dr. Banik were highly endorsed by USA’s leading academic/ administrative professionals and indeed, he was promoted to a Tenured Full Professor at the University of Texas in 2007 which was within a year from his last promotion to Associate Professor in 2006! Remarkably, in 2007 he was also recruited as the First President’s Endowed Professor in the 86 years’ history of the University of Texas- Pan American through an open competition. He has consistently ranked among the top 2% researcher in the world and Scholar GPS has ranked him as the top 0.05% scientist. Dr. Banik received many awards and some of these include the Indian Chemical Society’s Life- Time Achievement, Professor Asima Chatterjee Research Excellence, Best Researcher by Prince Mohammad Bin Fahd University and University of Texas- Pan American, University of Texas Board of Regents’ Outstanding Teaching, USA National Society of Collegiate Scholars Best Advisor, Mahatma Gandhi Excellence, Professor P. K. Bose Endowment, Dr. M. N. Ghosh Endowment, five top- cited Elsevier Papers, American Chemical Society Member Service, Outstanding UTPA Teacher and Researcher, New Jersey Board of Education Best Mentor, and UTPA Excellence for International Studies Awards. Notably, he received Eminent Alumnus recognition by all three institutions where he studied in India: Debipur Station High School, Itachuna B. N. College, and Burdwan University. Some of his achievements are highlighted and published by Indian Chemical Society, Royal Society of Chemistry, American Chemical Society, University of Texas Board of Regents, and Times of India.