A Selective AT2 Receptor Ligand with a γ-Turn-Like Mimetic Replacing the Amino Acid Residues 4−5 of Angiotensin II
摘要:
Three angiotensin II (Ang II) analogues encompassing a benzodiazepine-based gamma-turn-like scaffold have been synthesized. Evaluation of the compounds in a radioligand binding assay showed that they had no affinity to the rat liver AT(1) receptor. However, one of the compounds displayed considerable affinity to the pig uterus AT(2) receptor (K-i = 3.0 nM) while the other two lacked affinity to this receptor. It was hypothesized that the reason for the inactivity of one of these analogues to the AT(2) receptor was that the guanidino group of the Arg(2) residue and/or the N-terminal end of the pseudopeptide could not interact optimally with the receptor. To investigate this hypothesis, a conformational analysis was performed and a comparison was carried out with the monocyclic methylenedithioether analogue cyclo(S-CH2-S) [CyS3,5]-Ang II which is known to bind with high affinity to the AT(2) receptor (K-i = 0.62 nM). This comparison showed that, in the compounds with high AT(2) receptor affinity, the guanidino group of the Arg(2) residue and the N-terminal end could access common regions of space that were not accessible to the inactive compound. To examine the importance of the guanidino group for binding, the Arg side chain was removed by substituting Arg(2) for Ala(2) in the analogue having the high affinity. This analogue lacked affinity to AT(2) receptors, which supports the role of the guanidino group in receptor binding.
Amidine derivatives as inhibitors of nitric oxide synthase
申请人:AstraZeneca AB
公开号:US06489322B1
公开(公告)日:2002-12-03
There are provided novel compounds of formula (I)
wherein R1 represents a 2-thienyl or 3-thienyl ring and R2 represents hydrogen or C 1 to 4 alkyl and optical isomers and racemates thereof and pharmaceutically acceptable salts thereof; together with processes for their preparation, compositions containing them and their use in therapy. The compounds are selective inhibitors of the neuronal isoform of nitric oxide synthase.
FUSED BICYCLIC DERIVATIVES OF 2,4-DIAMINOPYRIMIDINE AS ALK AND c-MET INHIBITORS
申请人:Ahmed Gulzar
公开号:US20090221555A1
公开(公告)日:2009-09-03
The present invention provides a compound of formula I or II or a pharmaceutically acceptable salt form thereof, wherein R
1
, R
2
, R
3
, R
4
, R
5
, A
1
, A
2
, A
3
, A
4
, and A
5
, are as defined herein. The compounds of formula I or II have ALK and/or c-Met inhibitory activity, and may be used to treat proliferative disorders.
Fused Bicyclic Derivatives of 2,4-Diaminopyrimidine as ALK and c-MET Inhibitors
申请人:Ahmed Gulzar
公开号:US20120165519A1
公开(公告)日:2012-06-28
The present invention provides a compound of formula I or II
or a pharmaceutically acceptable salt form thereof, wherein R
1
, R
2
, R
3
, R
4
, R
5
, A
1
, A
2
, A
3
, A
4
, and A
5
, are as defined herein. The compounds of formula I or II have ALK and/or c-Met inhibitory activity, and may be used to treat proliferative disorders.