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A marked change of receptor affinity of the 2-methyl-5-(3-hydroxyphenyl)morphans upon attachment of an (E)-8-benzylidene moiety: synthesis and evaluation of a new class of sigma receptor ligands.

Abstract：

:The (E)-8-benzylidene and (E)-8-(3,4-dichlorobenzylidene), 7-ketone derivatives, 5 and 6, of the synthetic opiate 2-methyl-5-(3-hydroxyphenyl)morphan [5-(3-hydroxyphenyl)-2-methyl-2-azabicyclo[3.3.1]nonane, 1], were synthesized from the 7-ketone derivatives 2 or 4 via the Claisen-Schmidt reaction. The corresponding enantiomers of 5 and 6 were obtained in > 99% optical purity from the optical isomers of 4, resolved with the O,O'-dibenzoyltartaric acids. The absolute configurations of the enantiomers of 4 were determined by conversion, via Clemmensen reduction, to the enantiomers of 1, the configurations of which are known. The determination of the regioisomer and configurational isomer of 5, with respect to the introduced benzylidene group, was determined from a single-crystal X-ray analysis. 1H NMR data was used to confirm that 6 possessed the same configuration as 5. Radioreceptor binding studies in rat and guinea pig brain preparations revealed that (-)-(1S,5S)-5 displayed an 11-fold decrease in affinity for the opioid mu receptor and an increase in affinity for sigma receptors of 81-fold (low nanomolar affinity) relative to the ketone precursor (+)-(1S,5S)-4. An analogous, albeit less dramatic, trend was seen with compound (-)-(1S,5S)-6. Compounds (-)-(1S,5S)-5 and (-)-(1S,5S)-6 are distinct from the typical sigma-opiates in that they have very low affinity for either PCP sites or muscarinic receptors. The high affinity and selectivity of these novel sigma receptor ligands suggests that they will be valuable for the elucidation of the functional roles of sigma receptors.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Bertha CM,Mattson MV,Flippen-Anderson JL,Rothman RB,Xu H,Cha XY,Becketts K,Rice KC

doi

10.1021/jm00045a022

subject

Has Abstract

pub_date

1994-09-16 00:00:00

pages

3163-70

issue

19

eissn

0022-2623

issn

1520-4804

journal_volume

37

pub_type

杂志文章

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