The kinetic deuterium isotope effect as applied to metabolic deactivation of imatinib to the des-methyl metabolite, CGP74588
摘要:
There has recently been a burgeoning interest in impeding drug metabolism by replacing hydrogen atoms with deuterium to invoke a kinetic isotope effect. Imatinib, a front-line therapy for both chronic myeloid leukemia and of gastrointestinal stromal tumours, is often substantially metabolised via N-demethylation to the significantly less active CGP74588. Since deuterium-carbon bonds are stronger than hydrogen-carbon bonds, we hypothesised that the N-trideuteromethyl analogue of imatinib might be subject to a reduced metabolic turnover as compared to imatinib and lead to different pharmacokinetic properties, and hence improved efficacy, in vivo. Consequently, we investigated whether the N-trideuteromethyl analogue would maintain target inhibition and show a reduced propensity for N-demethylation in in vitro assays with liver microsomes and following oral administration to rats. The N-trideuteromethyl compound exhibited similar activity as a tyrosine kinase inhibitor as imatinib and similar efficacy as an antiproliferative in cellular assays. In comparison to imatinib, the trideuterated analogue also showed reduced N-demethylation upon incubation with both rat and human liver microsomes, consistent with a deuterium isotope effect. However, the reduced in vitro metabolism did not translate into increased exposure of the N-trideuteromethyl analogue following intravenous administration of the compound to rats and no significant difference was observed for the formation of the N-desmethyl metabolite from either parent drug. (C) 2013 Elsevier Ltd. All rights reserved.
The kinetic deuterium isotope effect as applied to metabolic deactivation of imatinib to the des-methyl metabolite, CGP74588
摘要:
There has recently been a burgeoning interest in impeding drug metabolism by replacing hydrogen atoms with deuterium to invoke a kinetic isotope effect. Imatinib, a front-line therapy for both chronic myeloid leukemia and of gastrointestinal stromal tumours, is often substantially metabolised via N-demethylation to the significantly less active CGP74588. Since deuterium-carbon bonds are stronger than hydrogen-carbon bonds, we hypothesised that the N-trideuteromethyl analogue of imatinib might be subject to a reduced metabolic turnover as compared to imatinib and lead to different pharmacokinetic properties, and hence improved efficacy, in vivo. Consequently, we investigated whether the N-trideuteromethyl analogue would maintain target inhibition and show a reduced propensity for N-demethylation in in vitro assays with liver microsomes and following oral administration to rats. The N-trideuteromethyl compound exhibited similar activity as a tyrosine kinase inhibitor as imatinib and similar efficacy as an antiproliferative in cellular assays. In comparison to imatinib, the trideuterated analogue also showed reduced N-demethylation upon incubation with both rat and human liver microsomes, consistent with a deuterium isotope effect. However, the reduced in vitro metabolism did not translate into increased exposure of the N-trideuteromethyl analogue following intravenous administration of the compound to rats and no significant difference was observed for the formation of the N-desmethyl metabolite from either parent drug. (C) 2013 Elsevier Ltd. All rights reserved.
The invention relates to N-phenyl-2-pyrimidine-amine derivatives of formula (I) wherein the substituents are defined as indicated in the description, to processes for the preparation thereof, to medicaments comprising those compounds, and the use thereof in the preparation of pharmaceutical compositions for the therapeutic treatment of warm-blooded animals, including humans.
The invention relates to N-phenyl-2-pyrimidine-amine derivatives of formula I
wherein the substituents are defined as indicated in the description, to processes for the preparation thereof, to medicaments comprising those compounds, and to the use thereof in the preparation of pharmaceutical compositions for the therapeutic treatment of warm-blooded animals, including humans.
The invention relates to N-phenyl-2-pyrimidine-amine derivatives of formula I
wherein the substituents are defined as indicated in the description, to processes for the preparation thereof, to medicaments comprising those compounds, and to the use thereof in the preparation of pharmaceutical compositions for the therapeutic treatment of warm-blooded animals, including humans.