62726-02-7Relevant academic research and scientific papers
Preparation and in vitro pharmacology of 5-HT4 receptor ligands. Partial agonism and antagonism of metoclopramide analogous benzoic esters
Elz,Keller
, p. 585 - 594 (2007/10/03)
Alicyclic ester analogues of the gastroprokinetic benzamide metoclopramide (1) and its ester congener SDZ 205557 (2), a 5-HT4 receptor antagonist, were prepared by O-alkylation of 4-amino-5-chloro-2-methoxybenzoate with N-(2-chloroethyl) substituted alicyclic amines. The bromo and iodo analogue of compound 13b (2-(1-piperidinyl)ethyl 4-amino-5-chloro-2-methoxybenzoate) were obtained by halogenation of dechloro-13b with N-halogenated succinimides. The series was evaluated in functional in vitro assays with regard to affinity for serotoninergic 5-HT4, 5-HT3 and muscarinic M3 receptors. The affinities for 5-HT3 and M3 receptors were below 6.0 (pK(B) or pA2). On 5-HT4 receptors in guinea-pig ileal longitudinal muscle and rat oesophagus, the majority of compounds revealed partial 5-HT4 receptor agonism susceptible to blockade by SDZ 205557, a reference 5-HT4 receptor antagonist (pK(B) = 7.25-7.73 (guinea-pig ileum) and 7.09-7.43 (rat oesophagus)). The relative agonist potency was in the range of 5-303% (5-HT: 100%). Compound 13b and its bromo analogue 17 were the most potent esters of the series. The enantiomers of 13g ((R)- and (S)-2-(2-methyl-1-piperidinyl)ethyl 4-amino-5-chloro-2-methoxybenzoate) interacted stereoselectively with 5-HT4 receptors and displayed enantiomeric potency ratios (R)/(S) of 4.3-8.7. There was an excellent correlation between (a) antagonist affinity on guinea-pig ileum and rat oesophagus, (b) relative agonist potency on guinea-pig ileum and rat oesophagus, and (c) between antagonist affinity and relative agonist potency within each assay (r2 > 0.91). The new compounds may serve as academic tools in evaluating the functional role of 5-HT4 receptors. The selective partial 5-HT4 receptor agonists presented in this paper may be useful to restore physiological motility and secretion in the gut with reduced or absent propensity to elicit tachycardia and desensitization of the intestinal target receptor.
Synthesis and preliminary data on new selective and potent gastric prokinetic substituted benzamides
Corona, L Del,Signorelli, G,Pinzetta, A,Coppi, G
, p. 419 - 425 (2007/10/02)
A series of amino-halogen-N- benzamides was synthesized and evaluated for enhancing gastric emptying.Compared to metoclopramide, domperidone and bromopride, a number of compounds were shown to be more active in enhancing gastric motility (rat stomach emptying), devoid of dopaminergic D2-receptor antagonism (rat apomorphine test) and to be less toxic. substituted benzamides / gastrokinetic activity
Kinetically-controlled displacement by azide on an allylic chloride: Synthesis of a highly potent serotonin-3 receptor ligand prototype
Rosen,Guarino
, p. 5391 - 5400 (2007/10/02)
The discovery and selective synthesis of a novel and highly potent serotonin-3 receptor ligand, 4-amino-5-chloro-2-methoxy-N-(1-azabicyclo[2.2.2]-oct-2-enyl-2-methyl) benzamide (4) are described. The key step in the preparation of 4 involves an unusual example of a kinetically controlled displacement to provide a thermodynamically disfavored allylic azide isomer. This azide is a precursor to 2-aminomethyl-1-azabicyclo[2.2.2]oct-2-ene, a convergent intermediate for the synthesis of analogs related to 4.
