Novel Potassium Channel Activators: Synthesis and Structure-Activity Relationship Studies of 3,4-Dihydro-2H-1,4-benzoxazine Derivatives.
作者:Yuzo MATSUMOTO、Ryuji TSUZUKI、Akira MATSUHISA、Kazuhisa TAKAYAMA、Toru YODEN、Wataru UCHIDA、Masaharu ASANO、Shigeo FUJITA、Isao YANAGISAWA、Takashi FUJIKURA
DOI:10.1248/cpb.44.103
日期:——
Strong potassium channel-activating effects were found among a series of novel 4-substituted 3, 4-dihydro-2H-1, 4-benzoxazine derivatives. The key step in preparation was the nucleophilic substitution of 3, 4-dihydro-2H-1, 4-benzoxazine (3) with activated halogenopyridines, such as halogenopyridine N-oxides (15a-c) and the borane adduct (15d) of 4-bromopyridine. Structure-activity relationship studies identified 2-(3, 4-dihydro-2, 2-dimethyl-6-nitro-2H-1, 4-benzoxazin-4-yl)pyridine-1-oxide (16a : YM934) as the optimal compound. This compound (16a) showed a more potent oral antihypertensive effect than cromakalim in conscious spontaneously hypertensive rats.
在一系列新型的4-取代3,4-二氢-2H-1,4-苯并氧氮杂䓬衍生物中,发现了强烈的钾通道激活效应。制备的关键步骤是用3,4-二氢-2H-1,4-苯并氧氮杂䓬(3)与活性卤代吡啶进行亲核取代反应,例如卤代吡啶N-氧化物(15a-c)和4-溴吡啶的硼烷加合物(15d)。构效关系研究表明,2-(3,4-二氢-2,2-二甲基-6-硝基-2H-1,4-苯并氧氮杂䓬-4-基)吡啶-1-氧化物(16a:YM934)为最佳化合物。该化合物(16a)在清醒的自发性高血压大鼠中显示出比克罗卡林更强的口服降压效果。