cales) are known to contain structurally unique secondary metabolites, such as plastoquinones, chromanols, a cyclopentenone, and polysaccharides. These compounds show various biological activities due to their unique structure. We previously reported that the methanolic extract of the brown alga, Sargassum micracanthum (KUETZING) ENDLICHER, “Togemoku” in Japanese, showed strong antioxidant acti...

ABSTRACT A simple and efficient approach has been developed to synthesise novel functionalised 5H-chromeno[2,3-d] pyrimidines derivatives (4a-h). This entails treating 2-amino-3-cyano-4H-chromenes (3a-h) with formamidine acetate under microwave irradiations solvent-free conditions. All structures of new compounds obtained in this study were characterised by IR, MS, 1H 13C NMR analysis. Addition...