Linked Life Data

6128421

Source:http://linkedlifedata.com/resource/pubmed/id/6128421

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
11
pubmed:dateCreated
1983-1-19
pubmed:abstractText
A useful method for the separation of labetalol into its two racemic diastereomers, as well as a stereoselective synthesis of its four stereoisomers, is described. The absolute stereochemistry of each isomer was determined by analysis of the DC spectra and confirmed by X-ray analysis. The alpha- and beta 1-adrenergic blocking properties, as well as the relative antihypertensive activities, have been measured in rats. The R,R isomer, 2a (SCH 19927), possesses virtually all of the beta 1-blocking activity elicited by labetalol and displays little alpha-blocking activity. In contrast, the S,R isomer, 3a, has most of the alpha-blocking activity. Of the four isomers, only 2a has antihypertensive potency comparable to that of labetalol. These findings, coupled with published data showing that labetalol possesses beta-adrenergic mediated peripheral vasodilating activity deriving essentially from its R,R isomer, lead to the following conclusion: The antihypertensive activity of labetalol can be ascribed to at least three identified complementary mechanisms, beta-adrenergic blockade, beta-adrenergic mediated vasodilatation, and alpha-adrenergic blockade, whereas the antihypertensive activity of 2a derives from the first two mechanisms only.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0022-2623
pubmed:author
pubmed:issnType
Print
pubmed:volume
25
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1363-70
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1982
pubmed:articleTitle
Synthesis and comparison of some cardiovascular properties of the stereoisomers of labetalol.
pubmed:publicationType
Journal Article