title: Synthesis and biological evaluation of some pyrimidine, pyrimido[2,1-b][1,3]thiazine and thiazolo[3,2-a]pyrimidine derivatives.
abstract: 4,6-Diamino-1H-pyrimidine-2-thione (1) was used for the preparation of pyrimidine derivatives 2-5. Compound 5 was cyclized to produce pyrimido[2,1-b][1,3]thiazine derivative 6 which was condensed with p-chlorobenzaldehyde to give compound 7. The latter compound was reacted with hydroxylamine to give isoxazolo[4,5-d]thiazino[2,3-a]pyrimidine 8. Compound 8b was treated with 2-chloroethyl methyl ether to afford compound 9. Similarly, compound 3 reacted with chloroacetic acid to give thiazolo[3,2-a]pyrimidine 10, which was condensed with p-chlorobenzaldehyde to give compound 11. Compound 11 was condensed with hydroxylamine to give isoxazolo[4,5-d]thiazolo[2,3-a]pyrimidine 12. Compound 12b was treated with 2-chloroethyl methyl ether to afford compound 13. Biological evaluation of some prepared products showed that many of them revealed promising antimicrobial activity.
authors.affiliation: Department of Photochemistry, National Research Center, Dokki, Cairo, Egypt. hayamsayed@yahoo.com
authors.forename: Hayam H
authors.initials: HH
authors.lastname: Sayed
authors.forename: Ahmed H
authors.initials: AH
authors.lastname: Shamroukh
authors.forename: Aymn E
authors.initials: AE
authors.lastname: Rashad
mesh_terms: D000890:Anti-Infective Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D001234:Aspergillus niger / Q000187:drug effects / Q000254:growth & development; D001412:Bacillus subtilis / Q000187:drug effects / Q000254:growth & development; D002176:Candida albicans / Q000187:drug effects / Q000254:growth & development; D008826:Microbial Sensitivity Tests; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013843:Thiazines / Q000138:chemical synthesis* / Q000494:pharmacology; D013844:Thiazoles / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D000890:Anti-Infective Agents; D011743:Pyrimidines; D013843:Thiazines; D013844:Thiazoles