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Synthesis and Biological Evaluation of NK1 Antagonists Derived from L-Tryptophan
- Source :
- Journal of Medicinal Chemistry. 38:934-941
- Publication Year :
- 1995
- Publisher :
- American Chemical Society (ACS), 1995.
-
Abstract
- The 3,5-bis(trifluoromethyl)benzyl ester of N-acetyl-L-tryptophan (3), which was derived from the screening lead N-ethyl-L-tryptophan benzyl ester, has been used as a starting point to identify high-affinity substance P receptor antagonists with improved in vivo activity. Altering the ester moiety to an amide or ether led to a substantial loss in binding affinity, but conversion to a ketone provided compounds with affinity comparable to the equivalent esters. A homochiral synthesis of the key intermediate amino ketone 15 was developed which allows its preparation on a large scale. From this intermediate a range of amine-containing acylamino derivatives were prepared with affinity optimized in the morpholinylbutyramide 161 which has an IC 50 of 0.17 nM at the human NK1 receptor. In addition to improving affinity, the amino group also provided aqueous solubility for a number of these derivatives. When tested in vivo the quinuclidine derivative L-737,488 (16i) was found to be an orally active (ID 50 = 1.8 mg/kg) inhibitor of substance P-induced dermal extravasation in the guinea pig.
- Subjects :
- Male
Ketone
Stereochemistry
medicine.drug_class
Guinea Pigs
Molecular Sequence Data
Ether
CHO Cells
Substance P
Cardiovascular System
Chemical synthesis
Aminoketone
Structure-Activity Relationship
chemistry.chemical_compound
Neurokinin-1 Receptor Antagonists
Piperidines
Heterocyclic Compounds
Cricetinae
Amide
Drug Discovery
medicine
Animals
Humans
Hypnotics and Sedatives
Moiety
Amino Acid Sequence
Amines
chemistry.chemical_classification
Binding Sites
Trifluoromethyl
Biphenyl Compounds
Ferrets
Tryptophan
Esters
Receptors, Neurokinin-1
Solubility
chemistry
Molecular Medicine
Female
Extravasation of Diagnostic and Therapeutic Materials
Quinuclidine
Subjects
Details
- ISSN :
- 15204804 and 00222623
- Volume :
- 38
- Database :
- OpenAIRE
- Journal :
- Journal of Medicinal Chemistry
- Accession number :
- edsair.doi.dedup.....add15b53df3a31853d6fb32c8d98080c