2 research outputs found
Synthesis of a Tetrahydronaphthyridine Spiropyrimidinetrione DNA Gyrase Inhibiting Antibacterial Agent - Differential Substitution at all Five Carbon Atoms of Pyridine.
The
synthesis of (−)-<b>1</b>, a potent antibacterial
agent, was achieved stereoselectively in nine steps from readily available
starting materials. Directed metalations were developed to assemble
a pentasubstituted pyridine with appropriately positioned aldehyde
and dimethylmorpholine substituents for a key tertiary amino effect
reaction (T-reaction) that led to the spirocylic architecture. Ultimately,
(−)-<b>1</b> was isolated as the thermodynamically most
favored stereoisomer
Optimization of Pyrrolamide Topoisomerase II Inhibitors Toward Identification of an Antibacterial Clinical Candidate (AZD5099)
AZD5099
(compound <b>63</b>) is an antibacterial agent that
entered phase 1 clinical trials targeting infections caused by Gram-positive
and fastidious Gram-negative bacteria. It was derived from previously
reported pyrrolamide antibacterials and a fragment-based approach
targeting the ATP binding site of bacterial type II topoisomerases.
The program described herein varied a 3-piperidine substituent and
incorporated 4-thiazole substituents that form a seven-membered ring
intramolecular hydrogen bond with a 5-position carboxylic acid. Improved
antibacterial activity and lower in vivo clearances were achieved.
The lower clearances were attributed, in part, to reduced recognition
by the multidrug resistant transporter Mrp2. Compound <b>63</b> showed notable efficacy in a mouse neutropenic Staphylococcus
aureus infection model. Resistance frequency versus
the drug was low, and reports of clinical resistance due to alteration
of the target are few. Hence, <b>63</b> could offer a novel
treatment for serious issues of resistance to currently used antibacterials