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A synthesis of novel  bis (tetrahydropyrimido[4,5- b ]quinoline-4,6-diones) connected to butenyl and butynyl spacers via thioether linkages is reported. Two equivalents of the appropriate aldehyde and dimedone were used in a multicomponent reaction with the corresponding  bis (6-aminopyrimidin-4(3 H )-ones) to produce the target products.  Bis (alkylation) of the appropriate 2-thioxohexahydropyrimido[4,5- b ]quinoline-4,6-dione in ethanolic potassium hydroxide with 1,4-dichlorobut-2-ene or 1,4-dibromobut-2-yne also produced the target compounds. Furthermore,  bis (tetrahydropyrimido[4,5- b ]quinolinetriones) linked to olefinic or acetylenic spacers  via  ether linkage were synthesized in high yields by a three-component reaction of the appropriate  bis (aldehydes) with two equivalents of both 6-aminothiouracil and dimedone.

polycyclic aromatic compounds

Synthesis of Novel  Bis (Sulfanediyl) Bis (Tetrahydropyrimido[4,5 -b ]Quinoline-4,6-Diones) Linked to Butenyl and Butynyl Spacers  via  Thioether Linkages