Structure-Based Design of New Constrained Cyclic Agonists of the Cholecystokinin CCK-B Receptor
摘要:
New constrained cyclic pseudopeptide cholecystokinin-B (CCK-B) agonists have been designed on the basis of conformational characteristics of the potent and selective CCK-B agonist Boc-Trp-(NMe)Nle-Asp-Phe-NH2 (K-i = 0.8 nm, selectivity ratio CCK-A/CCK-B > 6000) (Goudreau et al. Biopolymers, 1994, 34, 155-169). These compounds are among the first successful examples of macrocyclic constrained CCK4 analogs endowed with agonist properties and as such may be of value for the development of nonpeptide CCK-B agonists. The affinities and selectivities of these compounds for CCK-B and CCK-A receptors have been determined in vitro by measuring the displacement of [H-3]pCCK(8) binding to guinea pig cortex and pancreas membranes, respectively. The most potent compound, 8b, N-(cycloamido)-alpha-Me(R)Trp-[(2S)-2-amino-9-((cycloamido)carbonyl)nonanoyl]-Asp-Phe-NH2, has a K-i value of 15 +/- 1 nM for guinea pig cortex membranes with a good CCK-B selectivity ratio (CCK-A/CCK-B = 147). Furthermore, 8b behaved as a potent and full agonist in a functional assay which measures the stimulation of inositol phosphate accumulation in CHO cells transfected with the rat CCK-B receptor (EC(50) = 7 nM). The in vivo affinity of 8b for mouse brain CCK-B receptors was determined following intracerebroventricular injection (ID50 similar to 29 nmol/kg). 8b was also shown to cross the blood-brain barrier (0.16%), after intravenous administration in mice. 8b also increased gastric acid secretion measured in anesthetized rats after intravenous injection. Therefore, 8b appears to be an interesting pharmacological tool and is currently under investigation as a lead for further development of nonpeptide CCK-B agonists.
[EN] AMINOQUINAZOLINE DERIVATIVES AND THEIR SALTS AND METHODS OF USE<br/>[FR] DÉRIVÉS D'AMINOQUINAZOLINE ET LEURS SELS ET PROCÉDÉS D'UTILISATION
申请人:SUNSHINE LAKE PHARMA CO LTD
公开号:WO2013071697A1
公开(公告)日:2013-05-23
The present invention relates to the field of medicine. Provided herein are aminoquinazoline derivatives, their salts and pharmaceutical formulations useful in modulating the protein tyrosine kinase activity, and in modulating inter-and/or intra-cellular signaling. Also provided herein are pharmaceutically acceptable compositions comprising the aminoquinazoline compounds and methods of using the compositions in the treatment of hyperproliferative disorders in mammals, especially humans.
AMINOQUINAZOLINE DERIVATIVES AND THEIR SALTS AND METHODS OF USE
申请人:SUNSHINE LAKE PHARMA CO., LTD.
公开号:US20140228361A1
公开(公告)日:2014-08-14
The present invention relates to the field of medicine. Provided herein are aminoquinazoline derivatives, their salts and pharmaceutical formulations useful in modulating the protein tyrosine kinase activity, and in modulating inter- and/or intra-cellular signaling. Also provided herein are pharmaceutically acceptable compositions comprising the aminoquinazoline compounds and methods of using the compositions in the treatment of hyperproliferative disorders in mammals, especially humans.
The invention discloses compounds of Formula (I)
wherein R
1
, R
2
, R
2A
, R
3
, R
3A
, R
4
, R
4A
, and R
5
are as defined herein. The present invention relates to compounds and their use in the treatment of cystic fibrosis, methods for their production, pharmaceutical compositions comprising the same, and methods of treating cystic fibrosis by administering a compound of the invention.
Cycloadditions of arylidene imines of α-aminoacidesters to a range of dipolarophiles show substantial rate enhancements in the presence of Bronsted and Lewis acids. For Bronsted acids the rate is related to the pKa of the acid and cycloadditions to reactive dipolarophiles occur at room temperature. For the Lewis acids studied the rate acceleration decreases in the order Zn(OAc)2 > AgOAc > LiOAc >
The marineantibiotic korormicin, isolated from the culture filtrate of marine bacterial strain Pseudoalteromonas sp. F-420, specifically inhibits the growth of marine Gram-negative bacteria without affecting terrestrial species. The absolute configuration of korormicin was determined by the combination of a CD exciton chirality method and chemical degradation. Convergent total synthesis of koromicin