title: Antimicrobial and antitumor activity of N-heteroimmine-1,2,3-dithiazoles and their transformation in triazolo-, imidazo-, and pyrazolopirimidines.
abstract: The reaction of Appel's salt with o-amino nitrile heterocycles 10-19 gave the corresponding 4-chloro-5-heteroimmine-1,2,3-dithiazoles 20-29 which were evaluated for their antibacterial, antifungal and antitumor activity. Although all these N-heteroimines were devoid of significant antibacterial activity, they showed significant antifungal activity. Moreover, the same derivatives represent highly versatile intermediates in heterocyclic synthesis, in fact the pyrazoleimino dithiazoles 20-26 can be converted in one step into 2-cyano derivatives of the corresponding 4-methoxy-pyrazolo[3,4-d]pyrimidines 30-35 by sodium methoxide in refluxing methanol. This provides a general and attractive route to 4-methoxy-6-cyano pyrazolo[3,4-d]pyrimidines from 1-substituted 5-amino pyrazoles 10-19 in two simple steps. Finally, the isosteric replacement of the pyrazole ring atoms to give the imidazole[3,4-d]pyrimidine and triazole [4,5-d] pyrimidine ring systems was examined.
authors.affiliation: Dipartimento di Scienze Farmaceutiche, Università di Ferrara, Via Fossato di Mortara 17/19, 44100, Ferrara, Italy. pgb@dns.unife.it
authors.forename: Pier Giovanni
authors.initials: PG
authors.lastname: Baraldi
authors.forename: Maria Giovanna
authors.initials: MG
authors.lastname: Pavani
authors.forename: Maria del Carmen
authors.initials: Mdel C
authors.lastname: Nuñez
authors.forename: Patrizia
authors.initials: P
authors.lastname: Brigidi
authors.forename: Beatrice
authors.initials: B
authors.lastname: Vitali
authors.forename: Roberto
authors.initials: R
authors.lastname: Gambari
authors.forename: Romeo
authors.initials: R
authors.lastname: Romagnoli
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000494:pharmacology*; D002175:Candida / Q000187:drug effects; D004354:Drug Screening Assays, Antitumor; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006801:Humans; D020128:Inhibitory Concentration 50; D051379:Mice; D008826:Microbial Sensitivity Tests; D013329:Structure-Activity Relationship; D014407:Tumor Cells, Cultured
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000970:Antineoplastic Agents