title: Characterization and preliminary use of 1-, 2- and 3-methyl-5-phenyl-7-chloro-1,2,3-triazolo[4,5-d]pyrimidine as reaction intermediates.
abstract: This paper reports synthesis and characterization, by spectroscopic methods, of three new N-methyl-5-phenyl-7-chloro-1,2,3-triazolo[4,5-d]pyrimidine isomers 3a, 3b and 3c. For comparison purpose the 3-benzyl-5-phenyl-7-chloro-1,2,3-triazolo[4,5-d]pyrimidine (7) was also prepared. Starting from the isomer mixture 3a-c and the chloroderivative 7, by nucleophilic substitution reaction with ethyl carbazate and subsequent intramolecular cyclization, the new tricyclic derivatives 5a-c and 9 were prepared and tested towards the benzodiazepine and adenosine A1 and A2A receptors.
authors.affiliation: Dipartimento di Scienze Farmaceutiche, Università di Pisa, via Bonanno 6, 56126 Pisa, Italy.
authors.forename: Giuliana
authors.initials: G
authors.lastname: Biagi
authors.forename: Irene
authors.initials: I
authors.lastname: Giorgi
authors.forename: Oreste
authors.initials: O
authors.lastname: Livi
authors.forename: Valerio
authors.initials: V
authors.lastname: Scartoni
authors.forename: Pier Luigi
authors.initials: PL
authors.lastname: Barili
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D002417:Cattle; D058787:GABA-A Receptor Antagonists; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy; D058915:Purinergic P1 Receptor Antagonists; D011743:Pyrimidines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D011869:Radioligand Assay; D013056:Spectrophotometry, Ultraviolet; D014230:Triazoles / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D058787:GABA-A Receptor Antagonists; D058915:Purinergic P1 Receptor Antagonists; D011743:Pyrimidines; D014230:Triazoles