697806-98-7Relevant articles and documents
METHOD FOR DEUTERATION OR TRITIATION OF HETEROCYCLIC RING
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Page/Page column 13, (2008/06/13)
The present invention relates to a method for deuteration of a heterocyclic ring, which comprises subjecting a compound having a heterocyclic ring to sealed refluxing state in a deuterated solvent in the presence of an activated catalyst selected form a palladium catalyst, a platinum catalyst, a rhodium catalyst, a ruthenium catalyst, a nickel catalyst and a cobalt catalyst. In accordance with a method of the present invention, a hydrogen atom belonging to a heterocyclic ring of a compound having a heterocyclic ring can be very efficiently deuterated because temperature of deuteration reaction can be maintained at higher than boiling point of the solvent. Further, a method for deuteration of the present invention can be applied widely to deuteration of various compounds having a heterocyclic ring which are liable to decomposition under supercritical conditions or acidic conditions, leading to industrial and efficient deuteration of a compound having a heterocyclic ring.
Solid-state deuterium nmr of imidazole ligands in cytochrome C peroxidase
Liu, Kai,Williams, John,Lee, Hyerim,Fitzgerald, Melissa M.,Jensen, Gerard M.,Goodin, David B.,McDermott, Ann E.
, p. 10199 - 10202 (2007/10/03)
We have measured hyperfine shifted NMR signals associated with deuterated imidazole bound to the high-spin Fe3+ state of cytochrome c peroxidase using deuterium magic angle spinning solid-state NMR. These experiments were performed on a mutant of cytochrome c peroxidase, CcP(H175G), for which replacement of the proximal histidine with glycine produced a cavity that can bind a variety of substituted imidazoles including imidazole or 2-methylimidazole. The mutant with imidazole bound is inactive; specifically its reaction with H2O2 is blocked. We observed deuterium NMR signals from the methyl-d3 group of the perdeuterated 2-MeIm sample bound to H175G CcP. The signal displayed an upfield chemical shift and exhibited non- Curie temperature dependence, indicating the existence of low-lying excited electronic states. Upon introducing a nondeuterated competitive ligand, imidazole, a decrease in the intensity of this signal was detected, consistent with the assignment of the deuterium signal to the bound 2- methylimidazole in the solid state. The tensor of the deuterium static line shape indicates the methyl group on the untethered imidazole ring undergoes rather unhindered motion while the entire ring has relatively limited motion. No evidence for intermediate ring flipping exchange dynamics nor for large angular librations of the ring is observed. This the absence of enzymatic activity in the mutant is unlikely to result from excessive dynamic disorder of the untethered imidazole.