119881-02-6Relevant articles and documents
Glutathione peroxidase-like activity of amino-substitutedwater-soluble cyclic selenides: A shift of the major catalytic cycle in methanol
Arai, Kenta,Tashiro, Ayako,Osaka, Yuui,Iwaoka, Michio
, (2017/03/09)
We previously reported that water-soluble cyclic selenides can mimic the antioxidative function of glutathione peroxidase (GPx) in water through a simple catalytic cycle, in which the selenide (>Se) is oxidized by H2O2 to the selenoxide (>Se=O) and the selenoxide is reduced by a thiol back to the selenide. In methanol, however, the GPx-like activity could not be explained by this simple scenario. To look into the reasons for the unusual behaviors in methanol, monoamino-substituted cyclic selenides with a variable ring size were synthesized, and the intermediates of the catalytic cycle were characterized by means of 77Se-NMR and LC-MS spectroscopies. In water, it was confirmed that the selenide and the selenoxide mainly contribute to the antioxidative function, though a slight contribution from the dihydroxy selenane (>Se(OH)2) was also suggested. In methanol, on the other hand, other active species, such as hydroxyselenonium (>Se+-OH) and hydroxy perhydroxy selenane (>Se(OH)(OOH)), could be generated to build another catalytic cycle. This over-oxidation would be more feasible for amino-substituted cyclic selenides, probably because the ammonium (NH3 +) group would transfer a proton to the selenoxide moiety to produce a hydroxyselenonium species in the absence of an additional proton source. Thus, a shift of the major catalytic cycle in methanol would make the GPx-like antioxidative function of selenides perplexing.
Amidomalonamides useful as inhibitors of MMP of matrix metalloproteinase
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, (2008/06/13)
The present application relates to novel aminomalonamides of the formula and pharmaceutical composition thereof which are useful for inhibiting matrix metalloproteinases.
DIOL-CONTAINING RENIN INHIBITORS
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, (2008/06/13)
The invention concerns novel renin-inhibitory peptides which are useful for treating renin-associated hypertension, congestive heart failure, hyperaldosteronism, and diseases caused by retroviruses including HTLV-I and-III. Processes for preparing the peptides, composition containing them, and methods of using them are included. Also included is a diagnostic method which uses the compounds to determine the presence of renin-associated hypertensions, or hyperaldosteronism.