title: Design and synthesis of some substituted thiazolo[3,2-a]pyrimidine derivatives of potential biological activities.
abstract: In continuation to our previous work, thiazolopyrimidines 2a-x were synthesized through intramolecular cyclization of 2-phenacylthio-dihydropyrimidine hydrobromides 1a-x using polyphosphoric acid. On the other hand, thiazolo[3,2-a]pyrimidine-3-one 3 was coupled with aryldiazonium salts or condensed with isatin to afford compounds 4a-c or 5, respectively. Chemical structure of the target compounds was substantiated by IR, FT-IR, (1)H-, (13)C and DEPT-(13)C NMR, MS as well as microanalyses. Moreover, the lipophilicity of the target compounds is expressed as Clog P. The antimicrobial screening of the test compounds 2a-x, 4a-c and 5 revealed moderate activity in comparison to reference drugs. Compounds 2a-c, 2e, 2o and 2v showed a gradual increase in their anti-inflammatory activity reaching its maximum at 5 h compared to indomethacin. Furthermore, the analgesic activity of compounds 2a-c, 2e, 2o and 2v revealed a maximum activity after 5 h of injection compared to aspirin and the LD50 of compounds 2e and 2v was determined.
authors.affiliation: Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt.
authors.forename: Samia G
authors.initials: SG
authors.lastname: Abdel Moty
authors.affiliation: Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt.
authors.forename: Mostafa A
authors.initials: MA
authors.lastname: Hussein
authors.affiliation: Department of Pharmaceutical Medecinal Chemistry, Faculty of Pharmacy, Al Azhar University, Assiut, Egypt.
authors.forename: Salah A
authors.initials: SA
authors.lastname: Abdel Aziz
authors.affiliation: Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Al Azhar University, Assiut, Egypt.
authors.forename: Mahrous A
authors.initials: MA
authors.lastname: Abou-Salim
keywords: Analgesic; Anti-inflammatory; Antimicrobial; Synthesis; Thiazolopyrimidines