title: New heterocyclic structures. thiazolo[3,2-a][1,2,5] thiadiazolo[3,4-d]pyrimidine and [1,2,5]thiadiazolo[3',4':4,5] pyrimido[2,1-b][1,3]thiazine. biological assays.
abstract: 6,7-Dihydro-9H-thiazolo[3,2-a][1,2,5]thiadiazolo [3,4-d]pyrimidin-9-one, 7,8-dihydro-6H,10H-[1,2,5]thiadiazolo[3',4':4,5]pyrimido [2,1-b][1,3]thiazin-10-one and its 3-methyl derivative were prepared by reacting 6,7-diamino-2,3-dihydro-5H-thiazolo[3,2-a]pyrimidin-5-one, 7,8-diamino-3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3]thiazin-6-one or its 3-methyl derivative with N-thionylaniline. A reaction mechanism is proposed. The compounds and the sodium salts of (7-amino-2,3-dihydro-5H-thiazolo[3,2-a]pyrimidin-5-on-6-yl)sulfamic acid, (8-amino-3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3]thiazin-6-on-7-yl) sulfamic acid and its 3-methyl derivative were tested for antimicrobial and antimycotic activity on a number of strains, namely: E. Coli, Proteus mirabilis, P. vulgaris, Pseudomonas aeruginosa, Salmonella spp, Staphylococcus spp, Streptococcus faecalis, Bacillus subtilis, Sarcina lutea, Candida albicans, and for antiviral activity on Herpes simplex virus type 1 and Vescicular stomatitis virus. None of the compounds showed antiviral activity or exhibited biological activity against gram-negative, gram-positive bacteria or against mycetes.
authors.affiliation: Dipartimento di Scienze Farmaceutiche, Università di Modena, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Rinaldi
authors.forename: P
authors.initials: P
authors.lastname: Pecorari
authors.forename: C
authors.initials: C
authors.lastname: Cermelli
authors.forename: M
authors.initials: M
authors.lastname: Malagoli
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D000935:Antifungal Agents / Q000138:chemical synthesis / Q000494:pharmacology; D000998:Antiviral Agents / Q000138:chemical synthesis / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D005658:Fungi / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000494:pharmacology; D013829:Thiadiazines / Q000138:chemical synthesis* / Q000494:pharmacology; D013843:Thiazines / Q000138:chemical synthesis* / Q000494:pharmacology; D014709:Vero Cells; D010948:Viral Plaque Assay
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000935:Antifungal Agents; D000998:Antiviral Agents; D011743:Pyrimidines; D013829:Thiadiazines; D013843:Thiazines