Novel Selective Phosphodiesterase (PDE4) Inhibitors. 4. Resolution, Absolute Configuration, and PDE4 Inhibitory Activity of <i>cis</i>-Tetra- and <i>cis</i>-Hexahydrophthalazinones
作者:Margaretha Van der Mey、Hildegard Boss、Dennis Couwenberg、Armin Hatzelmann、Geert J. Sterk、Kees Goubitz、Henk Schenk、Hendrik Timmerman
DOI:10.1021/jm0110338
日期:2002.6.1
8a-tetrahydro-2H-phthalazin-1-ones show potent inhibition of phosphodiesterase (PDE4) activity, while the corresponding trans racemic mixtures exhibit only weak to moderate activity. To determine the absolute configuration and PDE4 inhibitory activity of the individual cis-enantiomers, several optically active phthalazinones have been synthesized. The enantiomers of the various gamma-keto acids, used as starting
最近,我们报道了4-儿茶酚取代的顺-(+/-)-4a,5,6,7,8,8a-六-和顺-(+/-)-4a,5,8,8a-四氢-2H-酞嗪-1-酮显示出对磷酸二酯酶(PDE4)活性的有效抑制作用,而相应的反式外消旋混合物仅表现出弱至中等的活性。为了确定各个顺式对映异构体的绝对构型和PDE4抑制活性,已合成了几种旋光性邻苯二氮酮。用作起始原料的各种γ-酮酸的对映异构体通过形成非对映异构体盐以经典方式拆分,然后以对映选择性的方式将其分别转化为旋光性酞嗪酮。顺式六氢酞嗪酮(+)-12的(+)-对映体的绝对构型通过X射线晶体学测定。发现在4a和8a位置的碳原子分别具有S-和R-构型。在本系列的六氢和四氢邻苯二氮酮中,观察到了对PDE4抑制的立体选择性。邻苯二氮酮的顺-(+)-对映体显示高抑制活性,而它们的(-)-对映体仅显示弱至中等活性。对于顺式(-)-类似物,所有顺式(+)-邻苯二氮酮都可能具有(4