当前位置： SCI文献检索 > JOURNAL OF MEDICINAL CHEMISTRY期刊下所有文献 > Studies of cardiotonic agents. 8. Synthesis and biological activities of optically active 6-(4-(benzylamino)-7-quinazolinyl)-4,5-dihydro-5-methyl-3(2H)- pyridazinone (KF15232).

Studies of cardiotonic agents. 8. Synthesis and biological activities of optically active 6-(4-(benzylamino)-7-quinazolinyl)-4,5-dihydro-5-methyl-3(2H)- pyridazinone (KF15232).

Abstract：

:We previously reported that (+/-)-6-(4-(benzylamino)-7-quinazolinyl)-4,5- dihydro-5-methyl-3(2H)-pyridazinone (+/-)-1, KF15232) showed potent cardiotonic activity with a strong myofibrillar Ca(2+)-sensitizing effect. As an extension of our work, we attempted to synthesize optically active 1. (+/-)-4-(4-(Benzylamino)-7-quinazolinyl)-3-methyl-4-oxobutyric acid (-)-menthyl ester (6) was separated into both diastereoisomers, and each was converted to optically pure 1 (> 99% ee) in an enantioselective manner. In order to determine the absolute configuration of the isomers, an alternative synthesis of optically active 1 was employed. The precursor of (-)-1 ((+)-9) was obtained by enantioselective synthesis from (R)-D-alanine. Consequently, we concluded that the absolute configuration of (-)-1 at the 5-position of the pyridazinone ring was R. The cardiotonic effects and inhibitory activities to PDE III and V of racemic 1 and (-)-1 were more potent than those of (+)-1. These compounds also demonstrated greater vasorelaxant effects in guinea pig aorta. In contrast, (+)-1 showed only weak cardiotonic and vasodilating effects, although the compound displayed potent Ca(2+)-sensitizing activity. Racemic and (-)-1 attracted our interest for the treatment of congestive heart failure.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Nomoto Y,Takai H,Ohno T,Nagashima K,Yao K,Yamada K,Kubo K,Ichimura M,Mihara A,Kase H

doi

10.1021/jm950197j

subject

Has Abstract

pub_date

1996-01-05 00:00:00

pages

297-303

issue

1

eissn

0022-2623

issn

1520-4804

pii

jm950197j

journal_volume

39

pub_type

杂志文章

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