The Reversible Proxibarbal-Valofan Isomerisation. Part II. Kinetic studies in a biphasic octanol/water system
作者:H. Harald Wittekind、Bernard Testa、Jurek Estreicher
DOI:10.1002/hlca.19880710534
日期:1988.8.10
octanol/H2O system. The rate constants of isomerisation and the equilibrium constants of (partition coefficients) were calculated by compartmental analysis. The rate constants of isomerisation were comparable with those determined in monophasic aqueous solutions, whereas at pH 7.4 and 37° the duration necessary for a global equilibrium to be reached was 4–6 times longer in the biphasic system. These reduced
在双相辛醇/ H 2 O系统中,在pH 7.4下研究了缬草烷(IIX和IIY )与probarbarbal (I)和两种非对映异构体之间的互变异构。通过区室分析计算异构化的速率常数和(分配系数)的平衡常数。异构化的速率常数与在单相水溶液中确定的速率常数相当,而在pH 7.4和37°下,达到全局平衡所需的持续时间在双相系统中要长4-6倍。与I相比,这些降低的速率以及IIX和IIY的更高的亲脂性可能具有药代动力学和药效学意义。它们也可能与许多已知或怀疑会形成内酯或内酰胺代谢物的药物有关。