Quantitative Structure-Activity Relationship Study of N-(3-Oxo-3,4-dihydro-2H-benzo [1,4]thiazine-6-carbonyl)guanidines as Potent Na/H Exchange Inhibitors.
作者:Takeshi YAMAMOTO、Manabu HORI、Ikuo WATANABE、Kengo HARADA、Shoji IKEDA、Hiroshi OHTAKA
DOI:10.1248/cpb.48.843
日期:——
We have previously reported that N-(4-isopropyl-2, 2-dimethyl-3-oxo-3, 4-dihydro-2H-benzo[1, 4]oxazine-6-carbonyl)guanidine (4b) methanesulfonate salt (KB-R9032) is a potent and highly water-soluble Na/H exchange inhibitor. In a series of studies on Na/H exchange inhibitors, we designed and synthesized N-(3-oxo-3, 4-dihydro-2H-benzo[1, 4]thiazine-6-carbonyl)guanidines (5) as more potent inhibitors with high water-solubility. The design strategy for 5 was based on a quantitative structure-activity relationship (QSAR) study, involving the proportional relationship between the biological activity and hydrophobicity of the ring structure of compounds 4. As expected, compounds 5 showed more potent activity than 4. It was found by using the QSAR analysis that 4 were about five-fold more potent than 4. The increase in potency of compounds 5 well agreed with our previous QSAR analysis result. The most potent derivative was the methanesulfonate salt 5d of the 4-isopropyl derivative(IC50=0.0091μM). And in addition to the in vitro study, 5d showed significant protective activity against a rat acute myocardial infraction model.
我们以前曾报道过,N-(4-异丙基-2, 2-二甲基-3-氧代-3, 4-二氢-2H-苯并[1, 4]恶嗪-6-甲酰基)胍(4b)甲磺酸盐(KB-R9032)是一种强效、高水溶性的 Na/H 交换抑制剂。在对 Na/H 交换抑制剂的一系列研究中,我们设计并合成了 N-(3-氧代-3,4-二氢-2H-苯并[1,4]噻嗪-6-羰基)胍(5),作为更有效的高水溶性抑制剂。5 的设计策略基于定量结构-活性关系(QSAR)研究,涉及生物活性与化合物 4 环结构疏水性之间的比例关系。通过 QSAR 分析发现,化合物 5 的药效比化合物 4 高出约五倍。最有效的衍生物是 4-异丙基衍生物的甲磺酸盐 5d(IC50=0.0091μM)。除了体外研究外,5d 对大鼠急性心肌梗塞模型也显示出显著的保护活性。