Development of a Peptidomimetic Antagonist of Neuropeptide FF Receptors for the Prevention of Opioid-Induced Hyperalgesia
摘要:
Through the development of a new class of unnatural ornithine derivatives as bioisosteres of arginine, we have designed an orally active peptidomimetic antagonist of neuropeptide FF receptors (NPFFR). Systemic low-dose administration of this compound to rats blocked opioid-induced hyperalgesia, without any apparent side-effects. Interestingly, we also observed that this compound potentiated opioid-induced analgesia. This unnatural ornithine derivative provides a novel therapeutic approach for both improving analgesia and reducing hyperalgesia induced by opioids in patients being treated for chronic pain.
N-Heteroarylation of Chiral α-Aminoesters by Means of Palladium-Catalyzed Buchwald–Hartwig Reaction
摘要:
N-Heteroaryl-alpha-amino acid derivatives are valuable pharmacological agents as peptidomimetics. Classical SNAr methods using acid catalysis and elevated temperatures could not be extended to various alpha-amino acids and fairly electrophilic heterocyclic partners. Here, we report a mild and versatile method of N-heteroarylation of chiral alpha-aminoesters without racemization, involving Buchwald-Hartwig conditions. It could be extended to various a-amino acids and azines. This efficient N-heteroarylation leads to (i) a chemical library of putative peptidomimetics combining diverse azaheterocycles with the chiral alpha-aminoesters and their corresponding derivatives (amides, alcohols, etc.) and (ii) arginine derivatives designed as NPFF receptor ligancls.
N-Heteroaryl-alpha-amino acid derivatives are valuable pharmacological agents as peptidomimetics. Classical SNAr methods using acid catalysis and elevated temperatures could not be extended to various alpha-amino acids and fairly electrophilic heterocyclic partners. Here, we report a mild and versatile method of N-heteroarylation of chiral alpha-aminoesters without racemization, involving Buchwald-Hartwig conditions. It could be extended to various a-amino acids and azines. This efficient N-heteroarylation leads to (i) a chemical library of putative peptidomimetics combining diverse azaheterocycles with the chiral alpha-aminoesters and their corresponding derivatives (amides, alcohols, etc.) and (ii) arginine derivatives designed as NPFF receptor ligancls.
Development of a Peptidomimetic Antagonist of Neuropeptide FF Receptors for the Prevention of Opioid-Induced Hyperalgesia
Through the development of a new class of unnatural ornithine derivatives as bioisosteres of arginine, we have designed an orally active peptidomimetic antagonist of neuropeptide FF receptors (NPFFR). Systemic low-dose administration of this compound to rats blocked opioid-induced hyperalgesia, without any apparent side-effects. Interestingly, we also observed that this compound potentiated opioid-induced analgesia. This unnatural ornithine derivative provides a novel therapeutic approach for both improving analgesia and reducing hyperalgesia induced by opioids in patients being treated for chronic pain.