Heterocycles have the potential to improve the quality of medicines, human life and the economy through their applications in medical, biotechnology, agriculture and food science. In present global scenario, natural heterocyclic products are gaining prominence, because they are economical, easily available and relatively free from side effects. The literature on heterocycles is growing rapidly, researchers are persistently attempting to decode the many secrets of heterocycles. We hope that the students of science, pharmacy and medical field shall be benefited by our efforts & acquire balanced knowledge of heterocycles. This book would be helpful for researchers who are engaged in synthetic chemistry and synthesizing anticancer, antimicrobial, antimalarial, compounds. No one is 100% perfect in his/her work. So valuable suggestions are always welcome for improvement of book from students, researchers & professionals.