Synthesis and Reactivity of 4H-Pyrido[1,2-a]pyrimidin-4-one
Amin A. Arafa, Mohammed E. Gad, Mohamed A. Ismail, Esraa S. Ahmedi, Basant Farag, Mohamed R. Fouad, Alaa E. Hassanien, Ghada G. El-BanaIntroduction/Objective:
4H-Pyrido[1,2-a]pyrimidin-4-one is a privileged fused heterocyclic scaffold that has attracted considerable interest owing to its structural versatility and broad biological relevance. This review highlights recent advances in the synthesis, functionalization, and applications of 4H-pyrido[1,2-a] pyrimidin-4-one derivatives.
Methods:
We critically examined relevant literature on the preparation and chemical transformations of 4H-pyrido[1,2-a]pyrimidin-4-one derivatives. We surveyed classical synthetic approaches, multicomponent reactions, green methodologies, and late-stage C-H functionalization strategies.
Results:
Numerous synthetic routes have been developed for the efficient construction of the 4Hpyrido[ 1,2-a]pyrimidin-4-one framework. Recent advances in electrochemical, photocatalytic, and transition-metal-catalyzed methodologies have enabled regioselective functionalization through halogenation, sulfonylation, thiocyanation, selenylation, sulfenylation, azidation, arylation, methylthiolation, and alkenylation.
Discussion:
Advances in synthetic and functionalization strategies have greatly expanded the chemical space of 4H-pyrido[1,2-a]pyrimidin-4-one derivatives. Modern electrochemical, photocatalytic, and metal-catalyzed approaches provide efficient, regioselective, and sustainable routes for the preparation of structurally diverse compounds, highlighting the synthetic versatility of this fused heterocyclic scaffold.
Conclusion:
4H-Pyrido[1,2-a]pyrimidin-4-one represents a valuable platform for the development of biologically active molecules. Continued exploration of environmentally benign synthetic methods and structure-activity relationships is expected to support future advances in the discovery of pharmaceuticals and agrochemicals.