Studies of Cardiotonic Agents. 8. Synthesis and Biological Activities of Optically Active 6-(4-(Benzylamino)-7-quinazolinyl)-4,5-dihydro-5-methyl- 3(2<i>H</i>)-pyridazinone (KF15232)
作者:Yuji Nomoto、Haruki Takai、Tetsuji Ohno、Ken Nagashima、Kozo Yao、Koji Yamada、Kazuhiro Kubo、Michio Ichimura、Akira Mihara、Hiroshi Kase
DOI:10.1021/jm950197j
日期:1996.1.1
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
我们先前曾报道(+/-)-6-(4-(苄基氨基)-7-喹唑啉基)-4,5-二氢-5-甲基-3(2H)-哒嗪酮(+/-)-1,KF15232)显示强大的肌原纤维Ca(2+)致敏作用的强心药活动。作为我们工作的扩展,我们尝试合成旋光性1.(+/-)-4-(4-(苄基氨基)-7-喹唑啉基)-3-甲基-4-氧代丁酸(-)-薄荷基酯( 6)被分离成两种非对映异构体,并且每一种都以对映选择性的方式转化为光学纯的1(> 99%ee)。为了确定异构体的绝对构型,采用了旋光性化合物1的另一种合成方法。通过(R)-D-丙氨酸的对映选择性合成获得(-)-1((+)-9)的前体。因此,我们得出的结论是,哒嗪酮环的5位上(-)-1的绝对构型为R。外消旋体1和(-)-1对PDE III和V的强心作用和抑制活性要强于(+)-1。这些化合物在豚鼠主动脉中也显示出更大的血管舒张作用。相反,(+)-1仅显示弱的强心和血管舒张