Related ArticlesApplication of LC-NMR and HR-NMR to the characterization of biphenyl impurities in the synthetic route development for vestipitant, a novel NK1 antagonist.
J Pharm Biomed Anal. 2010 Nov 2;53(3):389-95
Authors: Provera S, Martini L, Guercio G, Turco L, Costa L, Marchioro C
Vestipitant (1) is a novel NK1 antagonist currently under investigation for the treatment of CNS disorders and emesis. The first synthetic step comprised a Grignard synthesis. An impurity was identified and initially expected to be a symmetric biphenyl. This paper reports the work to synthesise the supposed structure and the spectroscopic analyses (LC-NMR and HR-NMR) to correctly identify the real structure and understand the chemical pathway of the impurity.
[Question from NMRWiki Q&A forum] About paragnetic impurities, inorganic salts, bad workups, etc. and their impact on small-molecule NMR spectra
About paragnetic impurities, inorganic salts, bad workups, etc. and their impact on small-molecule NMR spectra
I sometimes face the challenge of explaining to my organic chemists that, even if no impurity signals are visible in their 1H spectrum, other signs (like FID shape, very poor s/n compared to what could be expected with the sample qty, broad peaks, bad resolution...) indicate that clearly, something is wrong with their sample.
Everybody would agree that it's way much easier to convince an invidual based on concrete facts ("look, here we can see solvent/starting material/side...
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03-31-2011 09:21 PM
[NMR paper] Application of NMR SHAPES screening to an RNA target.
Application of NMR SHAPES screening to an RNA target.
Related Articles Application of NMR SHAPES screening to an RNA target.
J Am Chem Soc. 2003 Dec 24;125(51):15724-5
Authors: Johnson EC, Feher VA, Peng JW, Moore JM, Williamson JR
Several NMR screening techniques have been developed in recent years to aid in the identification of lead drug compounds. These NMR methods have traditionally been used for protein targets, and here we examine their applicability for an RNA target. We used the SHAPES compound library to test three different NMR...
nmrlearner
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11-24-2010 09:16 PM
[NMR paper] Application of 113Cd NMR to metallothioneins.
Application of 113Cd NMR to metallothioneins.
Related Articles Application of 113Cd NMR to metallothioneins.
Biodegradation. 1998;9(6):501-12
Authors: Vasák M
Metallothioneins constitute a class of ubiquitously occurring low molecular mass proteins (6-7 kDa) possessing two cysteine thiolate-based metal clusters usually formed by the preferential binding of d10 metal ions such as ZnII and CdII. The three-dimensional solution structure of mammalian proteins has been determined by two-dimensional NMR spectroscopy of 113Cd7-metallothionein. The...
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11-17-2010 11:06 PM
Application of LC-NMR to the identification of bulk drug impurities in NK1 antagonist
Application of LC-NMR to the identification of bulk drug impurities in NK1 antagonist GW597599 (vestipitant).
Related Articles Application of LC-NMR to the identification of bulk drug impurities in NK1 antagonist GW597599 (vestipitant).
Magn Reson Chem. 2010 Jul;48(7):523-30
Authors: Provera S, Guercio G, Turco L, Curcuruto O, Alvaro G, Rossi T, Marchioro C
Liquid chromatography-NMR (LC-NMR) spectroscopy was used to obtain detailed information regarding the structure of the major bulk drug impurities present in GW597599 (vestipitant). The...
Application of LC-NMR and HR-NMR to the characterization of biphenyl impurities in th
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