Synthesis and testing of azaglutamine derivatives as inhibitors of Hepatitis A Virus (HAV) 3C proteinase
摘要:
Hepatitis A virus (HAV) 3C proteinase is a picornaviral cysteine proteinase that is essential for cleavage of the initially synthesized viral polyprotein precursor to mature fragments and is therefore required for viral replication in vivo. Since the enzyme generally recognizes peptide substrates with L-glutamine at the P-1 site, four types of analogues having an azaglutamine residue were chemically synthesized: hydrazo-o-nitrophenylsulfenamides A (e.g. 16); frame-shifted hydrazo-o-nitrophenylsulfenamides B (e.g. 25-28); the azaglutamine sulfonamides C (e.g. 7, 8, 11, 12); and haloacetyl azaglutamine analogues 2 and 3. Testing of these compounds for inhibition of the HAV 3C proteinase employed a C24S mutant in which the non-essential surface cysteine was replaced with serine and which displays identical catalytic parameters to the wild-type enzyme. Sulfenamide 16 (type A) showed no significant inhibition. Sulfenamide 27 (type B) had an IC50 of ca 100 mu M and gave time-dependent inactivation of the enzyme due to disulfide bond formation with the active site cysteine thiol, as demonstrated by electrospray mass spectrometry. Sulfonamide 8 (type C) was a weak competitive inhibitor with an IC50 of approximately 75 mu M. The haloacetyl azaglutamine analogues 2 and 3 were time-dependent irreversible inactivators of HAV 3C proteinase with rate constants k(obs)[I] of 680 M-1 s(-1) and 870 M-1 s(-1), respectively, and were shown to alkylate the active site thiol. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis and testing of azaglutamine derivatives as inhibitors of Hepatitis A Virus (HAV) 3C proteinase
摘要:
Hepatitis A virus (HAV) 3C proteinase is a picornaviral cysteine proteinase that is essential for cleavage of the initially synthesized viral polyprotein precursor to mature fragments and is therefore required for viral replication in vivo. Since the enzyme generally recognizes peptide substrates with L-glutamine at the P-1 site, four types of analogues having an azaglutamine residue were chemically synthesized: hydrazo-o-nitrophenylsulfenamides A (e.g. 16); frame-shifted hydrazo-o-nitrophenylsulfenamides B (e.g. 25-28); the azaglutamine sulfonamides C (e.g. 7, 8, 11, 12); and haloacetyl azaglutamine analogues 2 and 3. Testing of these compounds for inhibition of the HAV 3C proteinase employed a C24S mutant in which the non-essential surface cysteine was replaced with serine and which displays identical catalytic parameters to the wild-type enzyme. Sulfenamide 16 (type A) showed no significant inhibition. Sulfenamide 27 (type B) had an IC50 of ca 100 mu M and gave time-dependent inactivation of the enzyme due to disulfide bond formation with the active site cysteine thiol, as demonstrated by electrospray mass spectrometry. Sulfonamide 8 (type C) was a weak competitive inhibitor with an IC50 of approximately 75 mu M. The haloacetyl azaglutamine analogues 2 and 3 were time-dependent irreversible inactivators of HAV 3C proteinase with rate constants k(obs)[I] of 680 M-1 s(-1) and 870 M-1 s(-1), respectively, and were shown to alkylate the active site thiol. (C) 1999 Elsevier Science Ltd. All rights reserved.
[EN] TRISUBSTITUTED PYRAZOLES AS ACETYLCHOLINE RECEPTOR MODULATORS<br/>[FR] PYRAZOLES TRISUBSTITUÉS EN TANT QUE MODULATEURS DES RÉCEPTEURS DE L'ACÉTYLCHOLINE
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2009135944A1
公开(公告)日:2009-11-12
The present invention relates to 1-alkyl-3-aniline-5-aryl-pyrazole derivatives and pharmaceutically acceptable salts thereof, processes for preparing them, pharmaceutical compositions containing them and their use in therapy, according to Formula (I). The invention particularly relates to positive allosteric modulators of nicotinic acetylcholine receptors, such positive allosteric modulator having the capability to increase the efficacy of nicotinic receptor agonists.
A process for production of 2-pyrazolin-5-ones having the formula (I): ##STR1## which comprises cyclizing hydrazone derivatives having the formula (II): ##STR2## in the presence of a base; wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represents a specific group; compounds having the formula (I) as well as compounds having the formula (II) and a process for production thereof.
TRISUBSTITUTED PYRAZOLES AS ACETYLCHOLINE RECEPTOR MODULATORS
申请人:Thuring Johannes Wilhelmus John F.
公开号:US20110065683A1
公开(公告)日:2011-03-17
The present invention relates to 1-alkyl-3-aniline-5-aryl-pyrazole derivatives and pharmaceutically acceptable salts thereof, processes for preparing them, pharmaceutical compositions containing them and their use in therapy, according to Formula (I).
The invention particularly relates to positive allosteric modulators of nicotinic acetylcholine receptors, such positive allosteric modulator having the capability to increase the efficacy of nicotinic receptor agonists.
Trisubstituted pyrazoles as acetylcholine receptor modulators
申请人:Thuring Johannes Wilhelmus John F.
公开号:US08779158B2
公开(公告)日:2014-07-15
The present invention relates to 1-alkyl-3-aniline-5-aryl-pyrazole derivatives and pharmaceutically acceptable salts thereof, processes for preparing them, pharmaceutical compositions containing them and their use in therapy, according to Formula (I).
The invention particularly relates to positive allosteric modulators of nicotinic acetylcholine receptors, such positive allosteric modulator having the capability to increase the efficacy of nicotinic receptor agonists.
Azodicarboxamides: A New Class of Cysteine Proteinase Inhibitor for Hepatitis A Virus and Human Rhinovirus 3C Enzymes
作者:Richard D. Hill、John C. Vederas
DOI:10.1021/jo9915123
日期:1999.12.1
Hepatitis A virus (HAV) 3C and human rhinovirus (HRV) 3C cysteine proteinases have been shown to be essential for viral maturation and infectivity through the cleavage of a viral polyprotein precursor. A number of bis-hydrazides (e.g., 11-14), analogous to nanomolar inhibitors of cathepsin K, were synthesized and tested for effectiveness against HAV 3C and HRV 3C proteinases, but these compounds showed no significant inhibition of the viral enzymes. However, oxidation of the bis-hydrazides to the corresponding azodicarboxamides gave potent, irreversible inhibitors with IC50's in the low micromolar range. These compounds probably act. by adding the active site thiol to the azo moiety in a Michael fashion to give a covalent complex, which was detected by electrospray mass spectrometry. Azodicarboxamide 16 was shown to have a rate constant (k(inact)/k(I)) of 35 644 M-1 min(-1).