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• W2004667097 abstract "Control of the glucose level in the blood plasma has been achieved in vitro and in vivo by administration of vanadium and zinc in form of inorganic salts. It has been shown that elements are poorly absorbed in their inorganic forms and required high doses which have been associated with undesirable side effects. Many researchers, therefore, have focused on metal complexes that were prepared from VOSO4 or ZnSO4 and low-molecular-weight bidentate ligands. Seven kinds of 1-hydroxy-4,6-disubstituted and 1-hydroxy-4,5,6-trisubstituted-2(1H)-pyrimidinones were synthesized by reaction of N-benzyloxyurea and β-diketones and subsequent removal of the protecting group. Six kinds of 1-hydroxy-4-(substituted)amino-2(1H)-pyrimidinones were synthesized by the substitution reaction of 1-benzyloxy-4-(1′,2′,4′-triazol-1′-yl)-2(1H)-pyrimidinone with various alkyl amines or amino acids. Treatment with VOSO4 and ZnSO4 or Zn(OAc)2 afforded vanadyl(IV) and zinc(II) complexes which were characterized by means of 1H NMR, IR, EPR, and UV–vis spectroscopies, and combustion analysis. The in vitro insulin–mimetic activity of these complexes was evaluated from 50% inhibitory concentrations (IC50) on free fatty acid (FFA) release from isolated rat adipocytes treated with epinephrine. Vanadyl complexes of 4,6-disubstituted-2(1H)-pyrimidinones showed higher insulin–mimetic activities than those of 4,5,6-trisubstituted ones. On the other hand, Zn(II) complexes showed lower insulin–mimetic activities than VOSO4 and ZnSO4 as positive controls. It was found that the balance of the hydrophilicity and/or hydrophobicity is important for higher insulin–mimetic activity. The in vivo insulin–mimetic activity was evaluated with streptozotocin (STZ)-induced diabetic rats. Blood glucose levels were lowered from hyperglycemic to normal levels after the treatment with bis(1,2-dihydro-4,6-dimethyl-2-oxo-1-pyrimidinolato)oxovanadium(IV) by daily intraperitoneal injections. The improvement in glucose tolerance was also confirmed by an oral glucose tolerance test." @default.
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• W2004667097 date "2006-02-01" @default.
• W2004667097 modified "2023-10-11" @default.
• W2004667097 title "Syntheses of vanadyl and zinc(II) complexes of 1-hydroxy-4,5,6-substituted 2(1H)-pyrimidinones and their insulin–mimetic activities" @default.
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• W2004667097 doi "https://doi.org/10.1016/j.jinorgbio.2005.11.010" @default.
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