A straightforward synthesis of highly functionalized 2-aminoethylidene-1,1-bisphosphonic acids via the Michael addition of amines to easily available tetrakis(trimethylsilyl) ethenylidene-1,1-bisphosphonate, H2C=C[P(O)(OTMS)2]2, has been described. The potassium salts of the title compounds were also easily achieved in high yield by reacting the Michael adducts with potassium fluoride.
通过胺对易于获得的四(三甲基
硅基)
乙烯叉
二膦酸酯(H2C=C[P(O)(OTMS)2]2)进行迈克尔加成反应,实现了高度官能化的2-
氨基亚甲基-1,1-
双膦酸的直接合成。通过将迈克尔加成产物与
氟化
钾反应,也很容易以高产率获得标题化合物的
钾盐。