当前位置： SCI文献检索 > EUROPEAN JOURNAL OF PHARMACOLOGY期刊下所有文献 > Stereoisomerism and muscarinic receptor agonists: synthesis and effects of the stereoisomers of 3-[5-(3-amino-1,2,4-oxadiazol)yl]-1- azabicyclo[2.2.1]heptane.

Stereoisomerism and muscarinic receptor agonists: synthesis and effects of the stereoisomers of 3-[5-(3-amino-1,2,4-oxadiazol)yl]-1- azabicyclo[2.2.1]heptane.

Abstract：

:The preparation and the biological activities of the four stereoisomers of 3-[5-(3-amino-1,2,4-oxadiazol)yl]-1-azabicyclo[2.2.1]heptane are described. The most potent stereoisomer, 3a, has the 3R,4R configuration, and in vitro activities in (pD2(% efficacy): ileum 8.8 (87%), hippocampus 9.8 (116%) and ganglion 10.2 (36%)). 3b (3S,4S) was weaker (ileum 8.1 (121%), hippocampus 8.5 (107%), ganglion 9.0 (63%)). The other two stereoisomers, 4a (3S,4R; ileum 7.1 (108%), hippocampus 8.2 (116%), ganglion 7.3 (31%)) and 4b (3R,4S; ileum 7.0 (100%), hippocampus 7.0 (120%), ganglion 7.2 (67%)) are of comparable activity, with an analogous profile to that of the more potent stereoisomers. Thus, compounds 3a and 4a, possessing the 4R stereochemistry, showed selectivity for the hippocampus over the ileum. Compound 3a was, however, more potent in the ganglion than in the hippocampus. All four stereoisomers were full agonists in the hippocampus, indicating M1 activity; however, they were partial agonists in the depolarisation of the rat superior cervical ganglion, another M1-mediated response. This may be due to M2-mediated hyperpolarization. With 3a (0.01 mg/kg i.p.), expression of c-fos mRNA was observed in the hypothalamus and in brain areas involved in sensory processing; these effects were totally blocked by pretreatment with 2 mg/kg scopolamine. In particular, activation of the superior colliculus is consistent with potent M2 activity.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Pombo-Villar E,Wiederhold KH,Mengod G,Palacios JM,Supavilai P,Boddeke HW

doi

10.1016/0922-4106(92)90049-2

keywords:

subject

Has Abstract

pub_date

1992-08-03 00:00:00

pages

317-25

issue

4

eissn

0014-2999

issn

1879-0712

journal_volume

226

pub_type

杂志文章

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