title: Synthesis of some new pyrimidine and fused pyrimidine derivatives (Part I).
abstract: 2-Hydroxy- and 2-Mercapto-3,4-dihydro-4-oxo-6-(furyl)-pyrimidine-5-carbonitriles (3a, b) were synthesized by two different routes. Methylation of 3a with methyl iodide gave the S-methyl derivative 4, which could also be prepared by two other different methods. The reaction of 4 with phosphorous oxychloride yielded the 4-chloro-pyrimidine derivative 6, which reacted with hydrazine hydrate, aroylhydr-azines, thiourea and phenylhydrazine to form the tetra-substituted pyrimidine derivative (8), the triazolopyrimidine derivatives (14a, b), the mercapto compound 7 and the pyrazolo[3,4-d]pyrimidine derivative 11, respectively. Compound 7 reacted with chloroacetone and gave 15 which reacted with aromatic aldehydes affording the tricyclic compounds (16a, b). Reaction of 8 with carbon disulphide and/or nitrous acid yielded the pyrazolo[3,4-d]-S-triazolo-[3,4-d]pyrimidine 13 and 12, respectively.
authors.affiliation: Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt.
authors.forename: Gamal A
authors.initials: GA
authors.lastname: Ahmed
authors.forename: Said
authors.initials: S
authors.lastname: el-Bahai
authors.lastname: Nasser
authors.forename: M
authors.initials: M
authors.lastname: Abd el-Salam
mesh_terms: D007202:Indicators and Reagents; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000737:chemistry; D013055:Spectrophotometry, Infrared
chemical_list: D007202:Indicators and Reagents; D011743:Pyrimidines