Lactam-Conformationally Restricted Analogs of N.ALPHA.-Arylsulfonyl Arginine Amide: Design, Synthesis and Inhibitory Activity toward Thrombin and Related Enzymes.
作者:Toru OKAYAMA、Sumie SEKI、Hajime ITO、Tomoko TAKESHIMA、Masaki HAGIWARA、Tadanori MORIKAWA
DOI:10.1248/cpb.43.1683
日期:——
Three new lactam-conformationally restricted arginine derivatives, 1-butyl-3-(6, 7-dimethoxy-2-naphthylsulfonyl)-3-(3-guanidinoropyl)-substituted γ-, δ-, and ε-lactams (2-4), were synthesized on the basis of backbone modification of the lead structure, 6, 7-dimethoxy-2-naphthylsulfonylarginine n-butylmethylamide (1). We tested these compounds for inhibitory activity toward thrombin and other trypsin-like enzymes (trypsin, factor Xa, plasmin, and kallikrein). All the compounds synthesized (1-4) potently inhibited thrombin with IC50 values of 0.75, 0.70, 0.92, and 3.2μM, respectively; they inhibited thrombin over 40-fold more effectively than the other enzymes tested. The γ-lactam (2) with the most profound inhibitory activity toward thrombin was a reversible inhibitor with a Ki of 0.26μM. Compound 2 also showed better thrombin selectivity than the lead compound (1). The lactam-conformational restriction of arylsulfonylarginine amides, especially γ-lactam, has thus proved to be a useful device for the improvement of antithrombotic activity.
在先导结构6,7-二甲氧基-2-萘磺酰精氨酸N-丁基甲基胺(1)的基础上,通过骨架修饰合成了三种新的内酰胺-构象限制精氨酸衍生物:1-丁基-3-(6,7-二甲氧基-2-萘磺酰)-3-(3-胍基丙基)取代的γ-、δ-和ε-内酰胺(2-4)。我们测试了这些化合物对凝血酶和其他胰蛋白酶样酶(胰蛋白酶、因子Xa、纤溶酶和高血糖素酶)的抑制活性。所有合成化合物(1-4)均能强效抑制凝血酶,其IC50值分别为0.75、0.70、0.92和3.2μM;它们对凝血酶的抑制效果比其他酶高出40倍以上。γ-内酰胺(2)对凝血酶的抑制活性最强,是一种可逆抑制剂,Ki值为0.26μM。化合物2对凝血酶的选择性也优于先导化合物(1)。内酰胺构象限制的芳基磺酰精氨酸酰胺,尤其是γ-内酰胺,已被证明是提高抗血栓活性的一种有效手段。