Identification of imine or enamine drug metabolites using online hydrogen/deuterium exchange and exact mass measurements
作者:Austin C. Li、Erya Yu、Steven C. Ring、James P. Chovan
DOI:10.1002/rcm.6178
日期:2012.4.30
Drugmetabolites that have imine or enamine partial structures cause extra mass‐to‐charge (m/z) increases in onlinehydrogen/deuteriumexchange (HDX) in addition to hydroxyl or amine protons. Online HDX and exactmassmeasurement were used herein to characterize this extra increase property, and to further confirm proposed metabolite structures.
The activity of a simple, commercially available copper salt, [Cu(NCMe)4](BF4) in intramolecular hydroamination reactions of alkynes and allenes is presented. Reactions were successfully carried out in technical acetonitrile in the presence of air. While attempts of alkene hydroamination failed, this catalysts was also found active in intermolecular aza-Michael reactions.
Three analogues of 5-diethoxyphosphoryl-5-methyl-1-pyrroline N-oxide (DEPMPO, 1) labelled with two (1-d2), five (1-d5) or seven (1-d7)
2H were synthesized and used to trap the tert-butylperoxyl radical. The EPR spectra of 1-d2-OOBut and 1-d7-OOBut spin adducts exhibited more straightforward patterns and better signal to noise ratio than those obtained with 1 or 1-d5. The use of the easily available 1-d2 as spin trap could help significantly the analysis of the EPR signals when the signal of either superoxide or alkylperoxyl spin adduct is superimposed with the signals of other spin adducts.