3-Oxo-5,6-dihydro-1,2,4-oxadiazines useful as antiandrogenic agents
申请人:Roussel Uclaf
公开号:US04108993A1
公开(公告)日:1978-08-22
Antiandrogenic compositions comprising an effective amount of at least one compound of the formula ##STR1## wherein X and Y are individually selected from the group consisting of hydrogen, halogen, --CF.sub.3, --NO.sub.3 and alkylthio of 1 to 4 carbon atoms and R is selected from the group consisting of hydrogen, alkyl of 1 to 6 carbon atoms, phenyl, benzyl and hydroxymethyl and an inert pharmaceutical carrier and a method of inducing antiandrogenic activity in warm-blooded animals as well as novel oxadiazines of formula I with the proviso that when R is other than benzyl or hydroxymethyl at least one of X and Y is alkylthio of 1 to 4 carbon atoms.
Role of Hydrophobic Interactions in Binding <i>S</i>-(<i>N</i>-Aryl/Alkyl-<i>N</i>-hydroxy- carbamoyl)glutathiones to the Active Site of the Antitumor Target Enzyme Glyoxalase I
作者:Avinash Kalsi、Malcolm J. Kavarana、Tianfen Lu、Dale L. Whalen、Diana S. Hamilton、Donald J. Creighton
DOI:10.1021/jm000160l
日期:2000.10.1
Hydrophobic interactions play an important role in binding S-(N-aryl/alkyl-N-hydroxycarbamoyl)glutathiones to the active sites of human, yeast, and Pseudomonas putida glyoxalase I, as the log K-i values for these mechanism-based competitive inhibitors decrease linearly with increasing values of the hydrophobicity constants (pi) of the N-aryl/alkyl substituents. Hydrophobic interactions also help to optimize polar interactions between the enzyme and the glutathione derivatives, given that the K-i value for S-(N-hydroxycarbamoyl)glutathione (pi = 0) with the human enzyme is 35-fold larger than the interpolated value for this compound obtained from the log K-i versus pi plot. Computational studies, in combination with published X-ray crystallographic measurements, indicate that human glyoxalase I binds the syn-conformer of S-(N-aryl-N-hydroxycarbamoyl)glutathione in which the N-aryl substituents are in their lowest-energy conformations. These studies provide both an experimental and a conceptual framework for developing better inhibitors of this antitumor target enzyme.
N-(1-Cyanocyclohexyl)-C-phenylnitrones and Glyoxaldinitrones
Six N-(1-cyanocyclohexyl)-C-phenylnitrones 4a-f (4b-f for the first time) and 22 glyoxaldinitrones 7a-v were prepared and tested for antithrombotic (p.o. administration to rats, 60 mg/kg) effects. Both classes of compounds exhibit considerable antithrombotic activities. Maximum inhibition of thrombus formation in arterioles (21%) was observed in N,N'-bis-2-phenylethylglyoxaldinitrone (7o) and N,N'-bis-4-nitrobenzylglyoxaldinitrone (7u). The compounds form only small amounts of nitric oxide in vitro by the addition of a Fe3+-porphyrine complex and an oxygen donor.