Roger Leger

Conformationally-restricted analogues of efflux pump inhibitors that potentiate the activity of levofloxacin in Pseudomonas aeruginosa

Conformational restriction of the ornithine residue of the efflux pump inhibitor D-ornithine-D-homophenylalanine-3-aminoquinoline (MC-02,595, 2) furnished bioisosteric proline derivatives that were less toxic in vivo and as active as the lead in potentiating the activity of the fluoroquinolone levofloxacin via the inhibition of efflux pumps in Pseudomonas aeruginosa.

Peptidomimetics of Efflux Pump Inhibitors Potentiate the Activity of Levofloxacin in Pseudomonas aeruginosa

Several classes of peptidomimetics of the efflux pump inhibitor D-ornithine-D-homophenylalanine-3-aminoquinoline (MC-02,595) have been prepared and evaluated for their ability to potentiate the activity of the fluoroquinolone levofloxacin in Pseudomonas aeruginosa. A number of the new analogues were as active or more active than the lead, demonstrating that a peptide backbone is not essential for activity.

Synthesis and In Vitro Analysis of Atrial Natriuretic Peptide-Albumin Conjugates

Atrial natriuretic peptide (ANP) is a clinically useful anti-hypertensive hormone. Maleimide derivatives of ANP have been synthesized and conjugated to cysteine-34 of human serum albumin. The conjugates were analyzed to assess their stability, receptor binding affinity and ability to stimulate guanylyl-cyclase activity in rat lung fibroblasts.

Free radical-induced C-allylation of α-bromolactones. Synthesis of 2-C-allyl-2-deoxy-d-arabino-and -d-ribono-1,4-lactones

Abstract Application of the Keck C -allylation of organic halides to 2-bromo-2-deoxy- d -arabinolactone resulted in the formation of mixtures of 2- C -allyl lactones. The stereochemical preferences observed were dictated by the nature of vicinal and remotely placed substituents in the lactone.