Síntesis y actividad antimicrobiana de derivados de 4,6-diaminopirimidinas análogos de citosina

A new synthesis of novel 4,6-diaminopyrimidines 2a-j, cytosine analogous, is described. This involves the base- assisted cyclization reaction of benzylidenemalononitriles 1a-j (BMNs) with urea. Compounds 1a-j were prepared by a Knoevenagel condensation reaction from benzaldehyde and malononitrile using EtOH as solvent at room temperature conditions. The antimicrobial activity against Gram-positive microorganisms: Staphylococcus aureus (ATCC 25923) and Bacillus cereus (ATCC 14579) and Gram-negative: Escherichia coli (ATCC 35218) and Pseudomonas aeruginosa (ATCC 27853) and the yeast Candida tropicalis (MLDM 372) is also reported. The compounds 2c, 2e, 2f, 2g, 2i and 2j are considered wide spectrum.