N-substituted cis-4a-(3-hydroxyphenyl)-8a-methyloctahydroisoquinolines are opioid receptor pure antagonists.

Abstract:

:N-Substituted cis-4a-(3-hydroxyphenyl)-8a-methyloctahydroisoquinolines (6a-g) were designed and synthesized as conformationally constrained analogues of the trans-3,4-dimethyl-4-(3-hydroxyphenyl)piperidine (4) class of opioid receptor pure antagonists. The methyloctahydroisoquinolines 6a-g can exist in conformations where the 3-hydroxyphenyl substituent is either axial or equatorial, similar to the (3-hydroxyphenyl)piperidines 4. The 3-hydroxyphenyl equatorial conformation is responsible for the antagonist activity observed in the (3-hydroxyphenyl)piperidine antagonists. Single-crystal X-ray analysis of 6a shows that the 3-hydroxyphenyl equatorial conformation is favored in the solid state. Molecular modeling studies also suggest that the equatorial conformation has lower potential energy relative to that of the axial conformation. Evaluation of 6a-g in the [(35)S]GTP-gamma-S in vitro functional assay showed that they were opioid receptor pure antagonists. N-[4a-(3-Hydroxyphenyl)-8a-methyl-2-(3-phenylpropyl)octahydroisoquinoline-6-yl]-3-(piperidin-1-yl)propionamide (6d) with a K(e) of 0.27 nM at the kappa opioid receptor with 154- and 46-fold selectivity relative to those of the micro and delta receptors, respectively, possessed the best combination of kappa potency and selectivity.

journal_name

J Med Chem

authors

Carroll FI,Chaudhari S,Thomas JB,Mascarella SW,Gigstad KM,Deschamps J,Navarro HA

doi

10.1021/jm058261c

keywords:

subject

Has Abstract

pub_date

2005-12-29 00:00:00

pages

8182-93

issue

26

eissn

0022-2623

issn

1520-4804

journal_volume

48

pub_type

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