PROCESS FOR THE PREPARATION OF SUBSTITUTED PYRIDONE CARBOXYLIC ACIDS
申请人:KULANGARA VIJAYA RAJ KUNIYIL
公开号:US20100076199A1
公开(公告)日:2010-03-25
The present invention relates to methods for the preparation of pyridone carboxylic acids for use as intermediates in the preparation of various synthetic organic compounds. The pyridone carboxylic acids can for example be used as intermediates in the production of potent antitumor agents, antifungal agents, antiviral agents, psychotherapeutic agents or contrast imaging agents for MRI.
Design, Synthesis, and Antimicrobial Evaluation of Hexadentate Hydroxypyridinones with High Iron(III) Affinity
作者:Ming-Xia Zhang、Chun-Feng Zhu、Ying-Jun Zhou、Xiao-Le Kong、Robert C Hider、Tao Zhou
DOI:10.1111/cbdd.12358
日期:2014.12
A range of hexadentate 3‐hydroxypyridin‐4‐ones (HPOs) with high affinity for iron(III) has been synthesized. The log stability constants of two HPO–iron complexes (logK1) were determined to be over 34, and pFe values of the two HPOs were determined to be over 31. Antimicrobial assay indicated that they are able to markedly inhibit the growth of both Gram‐positive and Gram‐negative bacteria. Compounds 14a and 14e were found to exhibit the strongest inhibitory activity against Staphyloccocus aureus, Bacillus subtilis, Pseudomonas aeruginosa, and Escherichia coli, with MIC values of 8, 8, 16, and 8 μg/mL, respectively. These results indicate that hexadentate 3‐hydroxypyridin‐4‐ones have potential application as antimicrobial agents, especially in the treatment of wound infection.
Design, synthesis and biological evaluation of 5-aminolaevulinic acid/3-hydroxypyridinone conjugates as potential photodynamic therapeutical agents
作者:Chun-Feng Zhu、Sinan Battah、Xiaole Kong、Brandon J. Reeder、Robert C. Hider、Tao Zhou
DOI:10.1016/j.bmcl.2014.12.018
日期:2015.2
5-Aminolaevulinic acid (ALA) prodrugs have been widely used in photodynamic therapy (PDT) as precursors to the natural photosensitizer, protoporphyrin IX (PpIX). The main disadvantage of this therapy is that ALA is poorly absorbed by cells due to its high hydrophilicity. In order to improve the therapeutical effect and induce higher yields of PpIX, a range of prodrugs of ALA conjugated to 3-hydroxypyridin4-ones (HPO) were synthesized. Pharmacokinetic studies indicated that some of the ALA-HPO conjugates are more efficient than ALA for PpIX production in the human breast adenocarcinoma cell line (MDA-MB-468). The intracellular porphyrin fluorescence levels showed good correlation with cellular phototoxicity following light exposure, suggesting the potential application of the ALA-HPO conjugates in photodynamic therapy. (C) 2014 Elsevier Ltd. All rights reserved.