Structural requirements for glyme catalysis in butylaminolysis of aryl acetates in chlorobenzene. Identification of -OCH2CH2OCH2CH2OCH2CH2O- as the optimal subunit for catalysis
摘要:
The catalytic behavior of linear (open-chain) polyethers (glymes) in butylaminolysis of 4-nitrophenyl acetate carried out in chlorobenzene has been reexamined (J. Am. Chem. Soc. 1980, 102, 2865-2866). The observation of a break in a plot of the catalytic rate constant vs chain length of catalyst indicates that four oxygens in a -OCH2CH2OCH2CH2OCH2CH2O-subunit are necessary for optimal catalysis. The break, occurring at four oxygens in the profile (corresponds to triglyme), has been verified by a Hammett analysis, which employed four additional aryl acetates (3-chlorophenyl, 3-bromophenyl, 3-cyanophenyl, and 4-cyanophenyl). This break was missed in a previous study (J. Am. Chem. Soc. 1980, 102, 2865-2866) because differing amounts of impurities in the glymes increased the experimental scatter of the data. The Hammett study supports the conclusions of others that breakdown of the zwitterionic tetrahedral intermediate is rate-limiting. The break in the polyether plot implies a specific structure for a glyme-zwitterionic tetrahedral intermediate complex, which contains an ammonium ion that hydrogen bonds to the ether oxygens.
[EN] TETRACYCLIC INDOLE DERIVATIVES AND METHODS OF USE THEREOF FOR THE TREATMENT OF VIRAL DISEASES [FR] DÉRIVÉS D'INDOLES TÉTRACYCLIQUES ET LEURS MÉTHODES D'UTILISATION POUR LE TRAITEMENT DE MALADIES VIRALES
Pyrrole inhibitors of S-nitrosoglutathione reductase as therapeutic agents
申请人:N30 Pharmaceuticals, Inc.
公开号:US09138427B2
公开(公告)日:2015-09-22
The present invention is directed to inhibitors of S-nitrosoglutathione reductase (GSNOR), pharmaceutical compositions comprising such GSNOR inhibitors, and methods of making and using the same.
[EN] INHIBITORS OF HEPATITIS C VIRUS REPLICATION<br/>[FR] INHIBITEURS DE LA RÉPLICATION DU VIRUS DE L'HÉPATITE C
申请人:MERCK SHARP & DOHME
公开号:WO2010111483A1
公开(公告)日:2010-09-30
The present invention relates to compounds of formula (I) that are useful as hepatitis C virus (HCV) NS5A inhibitors, the synthesis of such compounds, and the use of such compounds for inhibiting HCV NS5A activity, for treating or preventing HCV infections and for inhibiting HCV viral replication and/or viral production in a cell-based system.
[EN] NOVEL CYCLIC BENZIMIDAZOLE DERIVATIVES USEFUL ANTI-DIABETIC AGENTS<br/>[FR] NOUVEAUX DÉRIVÉS DE BENZIMIDAZOLE CYCLIQUES UTILES COMME AGENTS ANTI-DIABÉTIQUES
申请人:MERCK SHARP & DOHME
公开号:WO2010047982A1
公开(公告)日:2010-04-29
Novel compounds of the structural formula (I) are activators of AMP-protein kinase and are useful in the treatment, prevention and suppression of diseases mediated by the AMPK-activated protein kinase. The compounds of the present invention are useful in the treatment of Type 2 diabetes, hyperglycemia, Metabolic Syndrome, obesity, hypercholesterolemia, and hypertension.
Determination of aromaticity indices of thiophene and furan by nuclear magnetic resonance spectroscopic analysis of their phenyl esters
作者:Chang Kiu Lee、Ji Sook Yu、Hye-Jin Lee
DOI:10.1002/jhet.5570390615
日期:2002.11
series of m- and p-substituted phenyl benzoates, 2-thienoates, and 2-furoates were prepared and their 1H and 13C nmr spectroscopic characteristics were examined. In general, good correlations were observed between the chemical shift values of protons and carbons of the acyl aromatic rings and the Hammett σ. Plots of the chemical shift values of the carbonyl carbons of the benzoates against those of
The present invention relates to compounds of formula (I) that are useful as hepatitis C virus (HCV) NS5A inhibitors, the synthesis of such compounds, and the use of such compounds for inhibiting HCV NS5A activity, for treating or preventing HCV infections and for inhibiting HCV viral replication and/or viral production in a cell-based system.