Synthesis of highly deuterium-labeled (R)-K-13675, PPAR α agonist, for use as an internal standard for low-level quantification of drugs in plasma

A validated LC–MS/MS method for the low-level determination of pemafibrate, a novel SPPARMα, in plasma

Background: Pemafibrate, a novel selective peroxisome proliferator-activated receptor-α modulator, is prescribed for patients with dyslipidemia. To investigate other potential nonlipid-related effects of pemafibrate, the sensitive and rapid quantitation method for pemafibrate was required. Results: The developed LC–MS/MS assay method exhibited excellent accuracy, precision, sensitivity, stability, no matrix effect and high recovery. The LOQ (0.05 ng/ml) and run time (6.0 min) were superior to previous reports. The calibration curve showed good linearity over the wide concentration range (0.05–100.00 ng/ml). This validated method was successfully applied in a rat pharmacokinetic study using lower doses (0.02 or 0.10 mg/kg) than have been previously reported. Conclusion: This method can support gathering data for the evaluation of pemafibrate in future studies.

Improved Potency of Indole-Based NorA Efflux Pump Inhibitors: From Serendipity toward Rational Design and Development

The NorA efflux pump is a potential drug target for reversal of resistance to selected antibacterial agents, and recently we described indole-based inhibitor candidates. Herein we report a second class of inhibitors derived from them but with significant differences in shape and size. In particular, compounds 13 and 14 are very potent inhibitors in that they demonstrated the lowest IC₅₀ values (2 μM) ever observed among all indole-based compounds we have evaluated.

Multiple deuteration of alkanes synergistically-catalyzed by platinum and rhodium on carbon as a mixed catalytic system

A mild and efficient deuterium labeling method of alkanes based on the synergistic effect of Pt–Rh combination was developed.