Synthesis and in vitro biological profile of all four isomers of the potent muscarinic agonist 3-(3-methyl-1,2,4-oxadiazol-5-yl)-1-azabicyclo[2.2.1]heptane.

Abstract:

:The four stereoisomers of the muscarinic agonist 7 have been synthesized from enantiomerically pure exo-azanorbornane esters (13a,b). The esters were obtained in optically active form by separation of the carboxamide diastereomers 12a,b, formed from the borane complex of exo-azanorbornane-3-carboxylate 10 and a chiral amine auxiliary. Using the known chirality of (R)-alpha-methylbenzylamine, an X-ray analysis was accomplished on 12a in order to determine the absolute configuration of the azanorbornane C4 chiral center. Each of the chiral esters 13a,b was separately transformed into the oxadiazoles with concomitant epimerization at C3 of the azanorbornane ring to afford the thermodynamic equilibrium mixture of isomers. Chromatographic separation followed by analysis of each isomer by NMR and GC allowed the absolute stereochemistry of all four isomers of 7 to be confirmed. Full biological evaluation in biochemical and pharmacological assays revealed that the 3R,4R isomer was the most active on receptor binding studies and the most potent on the pharmacological preparations, showing a 50-fold increase in potency at the M2 and M3 sites compared to M1.

journal_name

J Med Chem

authors

Showell GA,Baker R,Davis J,Hargreaves R,Freedman SB,Hoogsteen K,Patel S,Snow RJ

doi

10.1021/jm00083a016

keywords:

subject

Has Abstract

pub_date

1992-03-06 00:00:00

pages

911-6

issue

5

eissn

0022-2623

issn

1520-4804

journal_volume

35

pub_type

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