A novel mercapto-bisphosphonate as an efficient anticalcification agent for bioprosthetic tissues
作者:Ivan S. Alferiev、Jeanne M. Connolly、Robert J. Levy
DOI:10.1016/j.jorganchem.2004.10.011
日期:2005.5
The synthesis of 2-(2-mercaptoethylamino)ethylidene–1,1-bisphosphonic acid (2) is reported (overall yield >90%), via nucleophilic addition of cystamine to vinylidene–bisphosphonic acid (1) followed by reduction of disulfide bonds with Me3P. Reaction of 1 with cysteamine forms the isomeric 2-(2-aminoethylthio)ethylidene–1,1-bisphosphonate (3) in an almost quantitative yield. Thiol groups of 2 in water
据报道,通过将巯基胺亲核加成到亚乙烯基-双膦酸(1)中,然后还原二硫键,可以合成2-(2-巯基乙氨基)亚乙基–1,1-双膦酸(2)(总收率> 90%)。与Me 3 P进行反应。1与半胱胺的反应以几乎定量的产率形成了异构体2-(2-氨基乙硫基)亚乙基– 1,1-双膦酸酯(3)。硫醇2组与已知的2-巯基亚乙基– 1,1-双膦酸酯相比,在pH 7的水中,环氧基的反应速度要快30倍以上。观察到硫醇基团的消除是膦与二硫化物还原中的副反应。在存在2的条件下用三缩水甘油胺稳定生物修复组织会导致2通过环氧-SH反应共价固定;这将生物假体心脏瓣膜组织的长期钙化抑制到几乎不可检测的水平。