Aspartic acid conjugates of 2-(3,4-dichlorophenyl)-N-methyl-N-[(1S)-1- (3-aminophenyl)-2-(1-pyrrolidinyl)ethyl]acetamide: κ Opioid receptor agonists with limited access to the central nervous system

An Chih Chang, Alan Cowan, Akira E. Takemori, Philip S. Portoghese

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Aspartic acid conjugates of 2-(3,4-dichlorophenyl)-N-methyl-N-[(1S)-1- (3-aminophenyl)-2-(1-pyrrolidinyl)ethyl]acetamide (5) were synthesized and evaluated in mice for antinociceptive activity by intravenous and intracerebroventricular routes of administration. The intravenously- administered α-conjugate of L-Asp (2), its D-Asp diastereomer (3), and the β-conjugate of L-Asp (4) were found to be 11-, 31-, and 40-fold, respectively, less effective than the parent ligand 1 (ICI 199,441) in producing central nervous system mediated antinociception in the mouse abdominal stretch assay. In addition, iv-administered 2 and 3 were found to also produce potent antinociception in the tonic phase of the mouse formalin assay, which is a model of tonic rather than acute pain. This study suggests that the attachment of a zwitterionic moiety to a position in the molecule that exhibits bulk tolerance is a viable strategy for the design of peripherally-selective and peripherally-active opioids.

Original languageEnglish (US)
Pages (from-to)4478-4482
Number of pages5
JournalJournal of medicinal chemistry
Volume39
Issue number22
DOIs
StatePublished - Oct 23 1996

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