Pilocarpine Prodrugs II. Synthesis, Stability, Bioconversion, and Physicochemical Properties of Sequentially Labile Pilocarpine Acid Diesters
作者:Hans Bundgaard、Erik Falch、Claus Larsen、Gerold L. Mosher、Thomas J. Mikkelson
DOI:10.1002/jps.2600750811
日期:1986.8
Various novel diesters of pilocarpic acid were synthesized and evaluated as prodrug forms for pilocarpine with the aim of improving the ocular delivery characteristics of the drug. The pilocarpic acid monoesters previously studied cyclized spontaneously to pilocarpine in aqueous solution and although they showed enhanced corneal permeability when compared with pilocarpine these monoesters suffered
合成了多种新的毛果酸二酯,并将其评价为毛果芸香碱的前药形式,目的是改善药物的眼部递送特性。先前研究的毛果酸单酯在水溶液中自发环化为毛果芸香碱,尽管与毛果芸香碱相比它们显示出增强的角膜通透性,但是这些单酯遭受差的溶液稳定性。本研究表明,可以通过封闭单酯中的游离羟基来完全解决此问题。通过将该基团酯化获得毛果酸的二酯。发现这类化合物在水溶液中具有很高的稳定性(估计在20摄氏度下的货架寿命超过5年),但同时在通过模拟涉及酶促过程的体内顺序模拟的体内条件下,很容易转化为毛果芸香碱。水解O-酰基键,然后自发内酯化中间毛果酸单酯。给出了在人血浆和各种兔眼匀浆中二酯的转化率数据。得出二酯的pH-溶解度曲线,并确定化合物的亲脂性参数。所有二酯的亲脂性均明显高于毛果芸香碱和相应的毛果酸单酯。