Syntheses of ring-hydroxylated nipradilols and their denitro derivatives.
作者:TOSHIHIRO AKASHI、KIYOSHI KAWAMURA、MASAMI SHIRATSUCHI、HIROSHI ISHIHAMA
DOI:10.1248/cpb.34.2024
日期:——
Nipradilol (NIP), 3, 4-dihydro-8-(2-hydroxy-3-isopropylamino)propoxy-3-nitroxy-2H-1-benzopyran, is extensively metabolized in man and dogs. In order to identify the ring-hydroxylated metabolites we have synthesized cis- and trans-4-hydroxy-, and 5-hydroxy-NIP, their denitro derivatives and 7-hydroxy-denitro-NIP. As judged from their spectra, trans-4-hydroxy- and 5-hydroxy-NIP and their denitro derivatives corresponded to the isolated ring-hydroxylated metabolites. Moreover, a pharmacological study in anesthetized spontaneously hypertensive rat showed that the nitroxy derivatives caused a transient hypotensive response, and both the nitroxy derivatives and the denitro derivatives caused long-lasting bradycardia.
尼普拉洛尔(NIP),3,4-二氢-8-(2-羟基-3-异丙氨基)丙氧基-3-硝氧基-2H-1-苯并吡喃,在人类和犬类中被广泛代谢。为了鉴定环羟基代谢物,我们合成了顺式和反式4-羟基、5-羟基-NIP及其脱硝衍生物和7-羟基-脱硝-NIP。根据其光谱判断,反式4-羟基-和5-羟基-NIP及其脱硝衍生物对应于分离得到的环羟基代谢物。此外,在麻醉的自发性高血压大鼠中的药理学研究表明,硝氧基衍生物引起了短暂的降压反应,而硝氧基衍生物和脱硝衍生物则导致了持久的心动过缓。