Synthesis and Characterization of 1,4,7-Triazacyclononane Derivatives with Methylphosphinate and Acetate Side Chains for Monitoring Free MgII by 31P and 1H NMR Spectroscopy
摘要:
A series of 1,4,7-triazacyclononane-based ligands containing one, two, or three methylphosphinate (MP) side chains has been prepared, The macrocycle with three methylphosphinates, NOTMP, appeared to be a very promising ligand for monitoring Mg-II in biological samples by P-31 NMR spectroscopy, The P-31 resonances of the free ligand and the Mg-II complex were well resolved, in slow exchange, and well downfield of typical tissue phosphate and phosphate ester metabolite resonances. The K-d value of the Mg(NOTMP) complex was 0.35 mM at physiological pH and temperature, a value which is optimal for accurate assessment of free Mg-II in cells and blood plasma. The latter was confirmed experimentally. Furthermore, the selectivity of NOTMP for Mg-II over Ca-II exceeded 2 orders of magnitude. The K-d values of the Mg-II complexes were sensitive to pH and temperature. The pH effects could be easily predicted from potentiometric pH titration data. Examination of the Mg-II ligand equilibria by P-31 NMR over a wide temperature range provided complexation enthalpies and entropies, It was shown that the smaller K-d values at higher temperatures were largely due to a temperature effect on the highest ligand protonation constant. Only a small endothermic complexation enthalpy contributed to this phenomenon.
A general synthesis of mono- and disubstituted 1,4,7-triazacyclononanes
作者:Zoltan Kovacs、A. Dean Sherry
DOI:10.1016/0040-4039(95)02009-e
日期:1995.12
1,4,7-Triazacyclononane reacts selectively with 2-(t-butoxycarbonyloxyimino)- and 2-(benzyloxycarbonyloxyimino)-2-phenylacetonitrile to give 1,4-diprotected derivatives which could be converted to mono and disubstituted triazacyclononanes.
Efficient synthesis and evaluation of bimodal ligand NETA
作者:Hyun-Soon Chong、Hyun A. Song、Noah Birch、Thien Le、Sooyoun Lim、Xiang Ma
DOI:10.1016/j.bmcl.2008.03.084
日期:2008.6
The efficient and short synthetic route to the structurally novel bimodal ligand NETA for antibody-targeted radiation therapy (radioimmunotherapy, RIT) of cancer was developed. The structure of NETA was determined by X-ray crystallography. The arsenazo-based UV spectroscopic complexation kinetics data suggest that NETA is a promising chelator for use in RIT applications of (212)Bi, (213)Bi, and (177)Lu. (c) 2008 Published by Elsevier Ltd.
[EN] METHODS FOR DIAGNOSIS AND TREATMENT OF PULMONARY HYPERTENSION<br/>[FR] MÉTHODES DE DIAGNOSTIC ET DE TRAITEMENT DE L'HYPERTENSION PULMONAIRE
申请人:[en]THE METHODIST HOSPITAL SYSTEM
公开号:WO2024025991A1
公开(公告)日:2024-02-01
A method is disclosed of detecting a disease associated with pulmonary vascular remodeling in a subject. The method can comprise administering to the subject a compound of Formula I or Formula II. The method can further comprise imaging the compound in lungs of the subject using positron emission tomography to determine uptake of the compound in pulmonary vasculature of the lungs, wherein retention of the compound in the pulmonary vasculature reflects vascular remodeling. Methods of treating a disease associated with pulmonary vascular remodeling or for imaging a pulmonary vasculature in a subject are also provided.