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. 2015 Oct 22;20(10):19263-76.
doi: 10.3390/molecules201019263.

Novel 2-Thioxanthine and Dipyrimidopyridine Derivatives: Synthesis and Antimicrobial Activity

Samar El-kalyoubi  1 , Fatmah Agili  2 , Shaker Youssif  3   4
Affiliations

Novel 2-Thioxanthine and Dipyrimidopyridine Derivatives: Synthesis and Antimicrobial Activity

Samar El-kalyoubi et al. Molecules. .

Erratum in

Abstract

Several fused imidazolopyrimidines were synthesized starting from 6-amino-1-methyl-2-thiouracil (1) followed by nitrosation, reduction and condensation with different aromatic aldehydes to give Schiff's base. The dehydrocyclization of Schiff's bases using iodine/DMF gave Compounds 5a-g. The methylation of 5a-g using a simple alkylating agent as dimethyl sulfate ((CH₃)₂SO₄) gave either monoalkylated imidazolopyrimidine 6a-g at room temperature or dialkylated derivatives 7a-g on heating 6a-g with ((CH₃)₂SO₄). On the other hand, treatment of 1 with different aromatic aldehydes in absolute ethanol in the presence of conc. hydrochloric acid at room temperature and/or reflux with acetic acid afforded bis-5,5́-diuracylmethylene 8a-e, which cyclized on heating with a mixture of acetic acid/HCl (1:1) to give 9a-e. Compounds 9a-e can be obtained directly by refluxing of Compound 1 with a mixture of acetic acid/HCl. The synthesized new compounds were screened for antimicrobial activity, and the MIC was measured.

Keywords: 6-amino-2-thiouracil; 6-amino-5-benzylideneamino-2-thiouracil; 8-aryl-3-methyl-2-methylthiopurine-6-ones; 8-aryl-3-methyl-2-thioxanthines.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Scheme 1
Scheme 1
Synthesis of 8-aryl-3,9-dimethyl-2-methylthio-3,9-dihydro-6H-purin-6-one.
Scheme 2
Scheme 2
Reactions of aromatic aldehydes with 6-amino-1-methyl-2-thiouracil.
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