Novel Potassium Channel Opener Prodrugs with a Slow Onset and Prolonged Duration of Action.
作者:Haruhiko HORINO、Tetsuya MIMURA、Syozo KOBAYASHI、Masahiro OHTA、Hideo KUBO、Kuniko ITO、Mitsuyoshi TSUMURA、Masayuki KITAGAWA
DOI:10.1248/cpb.48.490
日期:——
(-)-(3S, 4R, 1'R, 6'S)-4-(4-Benzyl-5-oxo-3, 4-diazabicyclo[4.1.0]hept-2-en-2-yloxy)-3, 4-dihydro-3-hydroxy-2, 2-dimethyl-2H-1-benzopyran-6-carbonitrile and its derivatives with a modified benzyl group were synthesized with the objective of discovering novel ATP-sensitive potassium channel openers (PCOs) with a slow onset of action and a reduced tendency to induce tachycardia. Among the compounds synthesized, 4-(2-chlorobenzyl) derivative 5bB had potent hypotensive activity in spontaneously hypertensive rats (SHRs). In addition, compound 5bB showed the desired pharmacological profile with a slow onset and long duration of action and induction of only mild tachycardia. Compound 5bB was found to be quantitatively metabolized in rats to give active des-2-chlorobenzyl derivative 6B. These results suggest that the incorporation of an N-benzyl group is a useful method for the preparation of prodruge, the function of which is to delay the onset and prolong the duration of action of the active substance.
合成了(-)-(3S, 4R, 1'R, 6'S)-4-(4-苄基-5-氧代-3, 4-二氮杂双环[4.1.0]庚-2-烯-2-基氧)的-3, 4-二氢-3-羟基-2, 2-二甲基-2H-1-苯并呋喃-6-氰化物及其改性苄基衍生物,目的是发现新的ATP敏感钾通道激活剂(PCOs),具有缓慢起效和减少诱发心动过速的倾向。在合成的化合物中,4-(2-氯苄基)衍生物5bB在自发性高血压大鼠(SHRs)中显示出强效的降压活性。此外,化合物5bB表现出理想的药理特性,具有缓慢起效和持久的作用,仅诱发轻微的心动过速。研究发现,化合物5bB在大鼠中被定量代谢为活性去-2-氯苄基衍生物6B。这些结果表明,N-苄基团的引入是一种有效的方法,用于制备前药,其功能是延迟活性物质的起效时间并延长其作用持续时间。