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Eco-friendly one-pot synthesis of new 6-iodo-4 H -pyrano[2,3- d ]pyrimidin-4-ones  via  the condensation of pyrimidine-4,6-diol, aldehydes, phenylacetylene, and iodine has been reported in water at 60 °C. To obtain the optimal reaction conditions, the effects of reaction temperature, bases and solvents were investigated. Under the optimal condition, formaldehyde and different aromatic aldehydes bearing both electron-donating and withdrawing groups underwent the reaction to give the corresponding 6-iodo-5,7-disubstituted-3 H -pyrano[2,3- d ] pyrimidin-4(5H)-one derivatives in high to excellent (90–97%) yields. This transformation generates 6-iodo-4 H -pyrano[2,3- d ]pyrimidin-4-one derivatives using a domino reaction involving Knoevenagel condensation and iodocyclization in the absence of metal or acidic/basic catalysts. The prepared products were characterized using FT-IR,  1 HNMR,  13 CNMR, and Mass spectroscopies.

polycyclic aromatic compounds

An Efficient and Green Synthesis of New 6-Iodo- Pyrano[2,3-d] Pyrimidine-4-Ones  via  a One-Pot Four-Component Reaction Followed by Iodocyclization in Water