title: Synthesis and Preliminary Cytotoxicity Studies of 1-[1-(4,5-Dihydrooxazol- 2-yl)-1H-indazol-3-yl]-3-phenylurea and 3-phenylthiourea Derivatives.
abstract: BACKGROUND
  N-substituted 3-amino-1H-indazoles represent an interesting class of biologically active compounds. Among them, derivatives containing phenylurea moiety are of particular interest. Such compounds have been found to possess inhibitory activity against cancer cell growth. Additionally, various oxazoline-containing compounds have also been designed as potential anticancer agents.
  
  
  OBJECTIVE
  The aim of this work was to obtain a new class of N-substituted 3-amino-1H-indazole derivatives with cytotoxic activity towards cancer cells.
  
  
  METHODS
  Two series of 1-[1-(4,5-dihydrooxazol-2-yl)-1H-indazol-3-yl]-3-phenylurea and 3- phenylthiourea derivatives 7-17 and 18-22, respectively, were prepared and screened for their potential in vitro cytotoxic activities against lung carcinoma LCLC-103H cell line using a crystal violet microtiter plate assay.
  
  
  RESULTS
  All the urea derivatives, except the compound 8, were inactive at a concentration of 20 μM attainable in cancer cells, while the thiourea derivatives showed a pronounced cancer cell growth inhibitory effects. The most potent 1-[1-(4,5-dihydrooxazol-2-yl)-1H-indazol-3-yl]-3-ptolylthiourea (19) exhibited cytotoxicity on the lung cancer LCLC-103H and cervical cancer SISO cell lines at a concentration of 10 µM. Moreover, compound 19 displayed cytostatic activity against pancreas cancer DAN-G cell line.
  
  
  CONCLUSIONS
  The 1-[1-(4,5-dihydrooxazol-2-yl)-1H-indazol-3-yl]-3-phenylthiourea derivatives described herein may serve as a useful scaffold for the search for novel anticancer agents.
authors.affiliation: Department of Chemical Technology of Drugs, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk. Poland.
authors.forename: Anita
authors.initials: A
authors.lastname: Kornicka
authors.affiliation: Department of Chemical Technology of Drugs, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk. Poland.
authors.forename: Franciszek
authors.initials: F
authors.lastname: Saczewski
authors.affiliation: Department of Pharmaceutical and Medicinal Chemistry, Institute of Pharmacy, University of Greifswald, F.-L. Jahn Strasse 17, D-17489 Greifswald. Germany.
authors.forename: Patrick J
authors.initials: PJ
authors.lastname: Bednarski
authors.affiliation: Department of Chemical Technology of Drugs, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk. Poland.
authors.forename: Martyna
authors.initials: M
authors.lastname: Korcz
authors.affiliation: Department of Chemical Technology of Drugs, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk. Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Szumlas
authors.affiliation: Department of Chemical Technology of Drugs, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk. Poland.
authors.forename: Ewa
authors.initials: E
authors.lastname: Romejko
authors.affiliation: Department of Chemical Technology of Drugs, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk. Poland.
authors.forename: Aneta
authors.initials: A
authors.lastname: Sakowicz
authors.affiliation: Department of Chemical Technology of Drugs, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk. Poland.
authors.forename: Lukasz
authors.initials: L
authors.lastname: Sitek
authors.affiliation: Department of Chemical Technology of Drugs, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk. Poland.
authors.forename: Monika
authors.initials: M
authors.lastname: Wojciechowska
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000494:pharmacology*; D045744:Cell Line, Tumor; D006801:Humans; D007191:Indazoles / Q000138:chemical synthesis / Q000494:pharmacology*; D010671:Phenylurea Compounds / Q000138:chemical synthesis / Q000494:pharmacology*; D013890:Thiourea / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology*
chemical_list: C000625186:1-(1-(4,5-dihydrooxazol-2-yl)-1H-indazol-3-yl)-3-ptolylthiourea; D000970:Antineoplastic Agents; D007191:Indazoles; D010671:Phenylurea Compounds; D013890:Thiourea
keywords: 1-[1-(4; 5-dihydrooxazol-2-yl)-1H-indazol-3-yl]-3-
  phenylureas; 5-dihydrooxazol-2-yl)-1H-indazol-3-yl]-3-phenylthioureas; Alzheimer's disease; Cytotoxic activity; anticancer agents; synthesis