title: Synthesis and antiproliferative activity in vitro of new 3-substituted aminoisoxazolo[5,4-b]pyridines.
abstract: The synthesis of 3-aminoisoxazolo[5,4-b]pyridine [III] and of several new 3-substituted aminoisoxazolo[5,4-b]pyridines is described. 3-Aminoisoxazlo[5,4-b]pyridine [III] was subjected to reactions with the acid halides and substituted aromatic aldehydes, leading to the production of the corresponding amides IV-VII, IX, XI-XVI and new tricyclic pyridoisoxazolopyrimidine VIII and Schiff bases XX-XXIV. 4-Chlorobutyroamide IX cyclized into 3-(pyrrolidinon-1-yl)isoxazolo[5,4-b]pyridine [X]. 3-Chloroacetylaminoisoxaxolo[5,4-b]pyridine [V] in reaction with secondary amines gave 3-aminoacetylaminoisoxazolo[5,4-b]pyridines XVII-XIX. The structures of the products II-XXIV were established on the basis of elemental analysis and spectral data IR, 1H NMR and MS. Selected compounds were tested for their antiproliferative activity in vitro. Two of them: 3-chloroacetyl-[V] and 3-2-bromo-propionylaminoisoxazolo[5,4-b]pyridine [VI] revealed cytotoxic activity against the cells of 8 various human or mouse tumor cell lines applied. Their ID50 (inhibitory dose 50%) values are in the range of the international activity criterion for synthetic agents (4 microg/ml).
authors.affiliation: Department of Technology of Drugs, Wroclaw University of Medicine, 1 Nankier Sq., 50-140 Wrocław, Poland. krysia@bf.uni.wroc.pl
authors.forename: Krystyna
authors.initials: K
authors.lastname: Poreba
authors.forename: Joanna
authors.initials: J
authors.lastname: Wietrzyk
authors.forename: Adam
authors.initials: A
authors.lastname: Opolski
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D045744:Cell Line, Tumor; D015195:Drug Design; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D007202:Indicators and Reagents; D007555:Isoxazoles / Q000138:chemical synthesis* / Q000494:pharmacology*; D011725:Pyridines / Q000138:chemical synthesis* / Q000494:pharmacology*; D012235:Rhodamines; D012545:Schiff Bases
chemical_list: D000970:Antineoplastic Agents; D007202:Indicators and Reagents; D007555:Isoxazoles; D011725:Pyridines; D012235:Rhodamines; D012545:Schiff Bases; C022027:lissamine rhodamine B