Abstract

New fluorescent compounds, 2‐substituted indeno[1,2‐d]pyrimidin‐5‐ones (3a, 3b, 3c, 3d) were synthesized in good yield by the reaction of 2‐[bis(methylsulfanyl)methylene]indan‐1,3‐dione (1) with the respective amidine derivatives [guanidine carbonate (2a), acetamidine hydrochloride (2b), S‐methylisothiourea sulfate (2c), and S‐benzylisothiourea sulfate (2d)]. 4‐Substituted amino‐2‐aminoindeno[1,2‐d]pyrimidin‐5‐ones (7b, 7c, 7d) were synthesized by a one‐pot reaction of 1, 2a and the respective amine compounds (4b, 4c, 4d) in pyridine. These fused pyrimidine derivatives showed fluorescence in the solid state.

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