65886-71-7Relevant academic research and scientific papers
Investigation of the polarographic properties and potential carcinogenity of some hydroxyurea derivatives by DC polarography
Novotny, Ladislav,Vachalkova, Anna,Piskala, Alois
, p. 656 - 662 (2007/10/03)
Polarographic reduction was studied for a series of 7 urea derivatives and the results were used to assess their potential carcinogenity. The polarographic reduction was examined in absolutely anhydrous dimethylformamide by DC polarography. In the conditions applied, the majority of the compounds was reduced within a single two-electron step, only biuret and its formyl derivative were reduced in two one-electron steps. The potential carcinogenity of the substances was assessed based on the tg a value of the slope of dependence of the polarographic wave height on the concentration of α-lipoic acid added as a test substance. For hydroxyurea, which is the only substance in this series for which a carcinogenic activity has been demonstrated, the tg a parameter attained a value of 0.290. Still higher values were obtained for the formyl derivatives - formylbiuret (0.362) and 2-carbamoyl-1-formylguanidine (0.510). So high tg a values warn of a significant potential carcinogenity. The other substances studied exhibited considerably lower tg α values, indicating that their potential carcinogenity will be low.
Silylation-Mediated Oxidation of 2,2'-Anhydro-5,6-dihydro-5-azacytidine
Abbasi, M. M.,El-Wassimi, M. T.,Osman, F. H.,Kamel, M. M.
, p. 209 - 216 (2007/10/02)
Reaction of 5,6-dihydro-5-azacytidine hydrochloride 1 with 2-acetoxy-isobutyryl chloride produced 5'-O-(2,5,5-trimethyl-1,3-dioxolan-4-on-2-yl)-3'-O-acetyl-5,6-dihydro-2,2'-anhydro-1-β-D-arabinofuranosyl-5-azacytosine hydrochloride 2, which upon partial hydrolysis with EtOH/HCl at 4 deg C gave 3'-O-acetyl-5,6-dihydro-2,2'-anhydro-1-β-D-arabinofuranosyl-5-azacytosine hydrochloride 3.The hydrolysis of 3 with EtOH/HCl at 25 deg C gave 2,2'-anhydro-5,6-dihydro-1-β-D-arabinofuranosyl-5-azacytosine hydrochloride 4.Silylation oxidation of 3 and 4 with BSTFA of BSA in acetonitrile produced the N-substituted derivatives of 1-β-D-arabinofuranosyl-5-azacytosine 8 and 7, respectively.
